Hi,
The system boots up using a boot loader that allows the unit to act as a thumb drive and access an SD card as well as load firmware updates from the sd card. This code initializes the system and sets the initial PLL and is difficult and dangerous for me to change. the code used to set PLL in the bootloader's Boot_up and system_init routines are shown below shown below:
void boot_up(void)
{
//Initialize the MCU clock PLL
system_init();

IODIR0 |= (1 << 31);
IOCLR0 |= (1 << 31); //Turn on USB LED

//Init UART0 for debug
PINSEL0 |= 0x00000005; //enable uart0
U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
U0DLM = 0x00;
U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
U0LCR = 0x03; // DLAB = 0

//Init rprintf
rprintf_devopen(putc_serial0);
rprintf("\n\n\nUSB Bootloader v1.1\n");

//IOSET0 |= (1 << 31); //Turn off USB LED
}

/**********************************************************
Initialize
**********************************************************/

#define PLOCK 0x400

void system_init(void)
{
// Setting Multiplier and Divider values
PLLCFG=0x24;
feed();

// Enabling the PLL */
PLLCON=0x1;
feed();

// Wait for the PLL to lock to set frequency
while(!(PLLSTAT & PLOCK)) ;

// Connect the PLL as the clock source
PLLCON=0x3;
feed();

// Enabling MAM and setting number of clocks used for Flash memory fetch (4 cclks in this case)
//MAMTIM=0x3; //VCOM?
MAMCR=0x2;
MAMTIM=0x4; //Original

// Setting peripheral Clock (pclk) to System Clock (cclk)
VPBDIV=0x1;
}
--- In l..., "Michael Anton" wrote:
>
> Perhaps you could post the balance of your UART code. The initialization
> looks fine to me.
>
> Have you tried using only 12MHz, and not going into 60MHz? Just to see if
> it is the changing
> between the clock speeds that has something to do with the behaviour you are
> seeing.
>
> Mike
>
> -----Original Message-----
> From: l... [mailto:l...]On Behalf Of
> ssonderhoff
> Sent: Monday, February 08, 2010 8:46 PM
> To: l...
> Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk - not working -
> Any Advice would be app.
>
>
>
>
> I will be appreciative for any insights, this is starting to get quite
> frustrating.
>
> This is the code used to set the PLL to 60mhz. I modified it to not set
> the PLL in slow mode (12mhz) on wake up and then eliminated going to this
> code all together. all gave the same result. As i mentioned earlier,
> everything works fine at 60mhz, where as at 12 mhz it has not worked with or
> without setting PLL. UART settings are in the previous message
>
> Thanks again,
> Stefan
>
> void PLL_init(int speed)
> {
>
> if(speed==fast){PLLCFG=0x24;} // Setting Multiplier(5) and Divider(4)
> so 5xosc (12mhz) = 60 mhz
> else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
>
> feed();
>
> PLLCON=0x1; // Enabling the PLL
> feed();
>
> while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> frequency
>
> PLLCON=0x3;// Connect the PLL as the clock source
> feed();
> }
> --- In l..., "ssonderhoff" wrote:
> >
> > I removed the setting the PLL - after wake up I do not set PLL -
> > same problem - UART0 outputs garbage (see sample)
> >
> > 07*6@7*6@0w*4@0w*4.
> >
> > the light on the serial connection is blinking and the junk is being
> output at a regular interval. these are the settings used to set the baud
> rate to 9600 - They seem correct to me
> >
> > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > U0DLM = 0x00; //msb = 0
> > U0DLL = 0x4E; //lsb = 78
> > U0FCR = 0x07; // enable and reset
> > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > //VICIntEnClr = 0x00000040;
> > U0IER = 0x00;
> >
> > I am at a loss and would appreciate any help
> > Stefan
> >
> >
> >
> > --- In l..., Sutton Mehaffey sutton@ wrote:
> > >
> > > I don't turn PLL on when I use PCLK=CCLK. Mine works fine. Try it and
> > > see if it fixes your problem. I think you only need PLL on if you need
> > > more speed than PCLK.
> > >
> > > ssonderhoff wrote:
> > > >
> > > > Thanks for the reply. I am running at 12mhz, and the I have a
> blinking
> > > > light that confirms that this is the case, along with a decrease in
> > > > power draw. I am setting the multiplier(M) to 1. I thought that you
> > > > had to specify the M and P values as well as select the external
> > > > oscillator. Could this be screwing things up? How does one avoid
> using
> > > > the PLL? on waking up from sleep mode, do you bother setting
> anything,
> > > > or should you actively disable the PLL by setting PLLC and PLLE to
> 0?
> > > > I assume that Pclk would then = cclk.
> > > >
> > > > Thanks again for the advice
> > > >
> > > >
> > > > --- In l... ,
> > > > Sutton Mehaffey wrote:
> > > > >
> > > > > What's your Fosc? If it is 12, I don't think you need to activate
> PLL0,
> > > > > if that's your CCLK speed.
> > > > >
> > > > >
> > > > >
> > > > > ssonderhoff wrote:
> > > > > >
> > > > > >
> > > > > > Perhaps I should re-state the question. The PLLCFG and UART)
> settings
> > > > > > seem to be correct - Please let me know if you can see some
> > > > mistake - Is
> > > > > > there anything else that could affect UART0 after a cclk change.
> The
> > > > > > port is active, but the output is garbage. Any thoughts would be
> > > > welcome.
> > > > > >
> > > > > > --- In lpc2000@yahoogroups .com
> ,
> > > > > > "ssonderhoff" wrote:
> > > > > > >
> > > > > > > I am running the lpc2148 at a low clock speed of 12 mhz to
> reduce
> > > > > > power usage. This is working, the power consumption is down and
> a
> > > > light
> > > > > > blinks at the correct rate. for each speed I reset the Uart0
> > > > parameters
> > > > > > to take the pclk into account (code below)
> > > > > > >
> > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > >
> > > > > > > At 60mhz Everything is working fine fine and I can read the
> output
> > > > > > debug text without any problem.
> > > > > > >
> > > > > > > At 12 mhz it outputs nothing but garbage, I have tried setting
> to
> > > > > > different baud rates from low to high with the same result.
> > > > > > >
> > > > > > > The Uart settings were determined using the NXP lpc2000
> calculator
> > > > > > >
> > > > > > > I believe that I have faithfully followed the data sheet. Can
> > > > anyone
> > > > > > tell me what I am missing?
> > > > > > > Thanks,
> > > > > > > Stefan
> > > > > > >
> > > > > > > //*********CODE* ********* *
> > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > {
> > > > > > >
> > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting Multiplier(5) and
> > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting Multiplier(1) and
> > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > >
> > > > > > > feed();
> > > > > > >
> > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > feed();
> > > > > > >
> > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > frequency
> > > > > > >
> > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > feed();
> > > > > > >
> > > > > > > }
> > > > > > > //********** ********* ********* ********* ********* *********
> > > > > > ********* ***
> > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > {
> > > > > > >
> > > > > > >
> > > > > > > if(speed==fast)
> > > > > > > {
> > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > U0IER = 0x00;
> > > > > > > }
> > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > {
> > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> mulval(7:4) = 12
> > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > U0LCR = 0x03;
> > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > U0IER = 0x00;
> > > > > > > }
> > > > > > >
> > > > > > > }
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > --
> > > > > Sutton Mehaffey
>

Start a New Thread

> -----Original Message-----
> From: l...
> [mailto:l...]On Behalf
> Of ssonderhoff
> Sent: Monday, February 08, 2010 10:54 PM
> To: l...
> Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> not working
> - Any Advice would be app.
>
> Hi,
> The system boots up using a boot loader that allows the unit
> to act as a thumb drive and access an SD card as well as load
> firmware updates from the sd card. This code initializes the
> system and sets the initial PLL and is difficult and
> dangerous for me to change. the code used to set PLL in the
> bootloader's Boot_up and system_init routines are shown below
> shown below:
>

Couldn't you write a piece of standalone test code, without
the bootloader, to test your routines when running at 12MHz?

>
> void boot_up(void)
> {
> //Initialize the MCU clock PLL
> system_init();
>
> IODIR0 |= (1 << 31);
> IOCLR0 |= (1 << 31); //Turn on USB LED
>
> //Init UART0 for debug
> PINSEL0 |= 0x00000005; //enable uart0
> U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> U0DLM = 0x00;
> U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock

So are you using a 58982400Hz clock, or 60MHz? If this is not
60MHz, you will likely encounter USB problems, as obviously you
cannot reach 48MHz with enough accuracy either.

> U0LCR = 0x03; // DLAB = 0
>
> //Init rprintf
> rprintf_devopen(putc_serial0);
> rprintf("\n\n\nUSB Bootloader v1.1\n");
>
> //IOSET0 |= (1 << 31); //Turn off USB LED
> }
>
> /**********************************************************
> Initialize
> **********************************************************/
>
> #define PLOCK 0x400
>
> void system_init(void)
> {
> // Setting Multiplier and Divider values
> PLLCFG=0x24;
> feed();
>
> // Enabling the PLL */
> PLLCON=0x1;
> feed();
>
> // Wait for the PLL to lock to set frequency
> while(!(PLLSTAT & PLOCK)) ;
>
> // Connect the PLL as the clock source
> PLLCON=0x3;
> feed();
>
> // Enabling MAM and setting number of clocks used for
> Flash memory fetch (4 cclks in this case)
> //MAMTIM=0x3; //VCOM?
> MAMCR=0x2;
> MAMTIM=0x4; //Original

It may not matter, but I usually change the MAM timing values
prior to enabling the PLL. My rational is that if the values
are set wrong when already running at 60MHz, how could I expect
to reliably set them? Since there is no guarantee that I can read
from flash if they are set for a lower clock rate.

>
> // Setting peripheral Clock (pclk) to System Clock (cclk)
> VPBDIV=0x1;
> }

Like I said before, your initialization looks fine, but I suspect the
problem you are having might be elsewhere. So it would be useful to
see the rest of your serial port code. Perhaps there is some timing
issue that occurs when you run 5 times slower.

When I developed my UART code, I had all sorts of problems that would
occur at times, with seemingly no explanation, until I figured out
the problem. It was very non-obvious at the time.

So, if you can, break this down into a small piece of code that
demonstrates the problem, I'll take a look at it.

Mike

> --- In l..., "Michael Anton" wrote:
> >
> > Perhaps you could post the balance of your UART code. The
> initialization
> > looks fine to me.
> >
> > Have you tried using only 12MHz, and not going into 60MHz?
> Just to see if
> > it is the changing
> > between the clock speeds that has something to do with the
> behaviour you are
> > seeing.
> >
> > Mike
> >
> > -----Original Message-----
> > From: l...
> [mailto:l...]On Behalf Of
> > ssonderhoff
> > Sent: Monday, February 08, 2010 8:46 PM
> > To: l...
> > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> pclk - not working -
> > Any Advice would be app.
> >
> >
> >
> >
> > I will be appreciative for any insights, this is starting
> to get quite
> > frustrating.
> >
> > This is the code used to set the PLL to 60mhz. I modified
> it to not set
> > the PLL in slow mode (12mhz) on wake up and then eliminated
> going to this
> > code all together. all gave the same result. As i mentioned earlier,
> > everything works fine at 60mhz, where as at 12 mhz it has
> not worked with or
> > without setting PLL. UART settings are in the previous message
> >
> > Thanks again,
> > Stefan
> >
> > void PLL_init(int speed)
> > {
> >
> > if(speed==fast){PLLCFG=0x24;} // Setting
> Multiplier(5) and Divider(4)
> > so 5xosc (12mhz) = 60 mhz
> > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> >
> > feed();
> >
> > PLLCON=0x1; // Enabling the PLL
> > feed();
> >
> > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > frequency
> >
> > PLLCON=0x3;// Connect the PLL as the clock source
> > feed();
> > }
> > --- In l..., "ssonderhoff"
> wrote:
> > >
> > > I removed the setting the PLL - after wake up I do not set PLL -
> > > same problem - UART0 outputs garbage (see sample)
> > >
> > > 07*6@7*6@0w*4@0w*4.
> > >
> > > the light on the serial connection is blinking and the
> junk is being
> > output at a regular interval. these are the settings used
> to set the baud
> > rate to 9600 - They seem correct to me
> > >
> > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > U0DLM = 0x00; //msb = 0
> > > U0DLL = 0x4E; //lsb = 78
> > > U0FCR = 0x07; // enable and reset
> > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > //VICIntEnClr = 0x00000040;
> > > U0IER = 0x00;
> > >
> > > I am at a loss and would appreciate any help
> > > Stefan
> > >
> > >
> > >
> > > --- In l..., Sutton Mehaffey sutton@ wrote:
> > > >
> > > > I don't turn PLL on when I use PCLK=CCLK. Mine works
> fine. Try it and
> > > > see if it fixes your problem. I think you only need
> PLL on if you need
> > > > more speed than PCLK.
> > > >
> > > > ssonderhoff wrote:
> > > > >
> > > > > Thanks for the reply. I am running at 12mhz, and
> the I have a
> > blinking
> > > > > light that confirms that this is the case, along
> with a decrease in
> > > > > power draw. I am setting the multiplier(M) to 1. I
> thought that you
> > > > > had to specify the M and P values as well as select
> the external
> > > > > oscillator. Could this be screwing things up? How
> does one avoid
> > using
> > > > > the PLL? on waking up from sleep mode, do you bother setting
> > anything,
> > > > > or should you actively disable the PLL by setting
> PLLC and PLLE to
> > 0?
> > > > > I assume that Pclk would then = cclk.
> > > > >
> > > > > Thanks again for the advice
> > > > >
> > > > >
> > > > > --- In l...
> ,
> > > > > Sutton Mehaffey wrote:
> > > > > >
> > > > > > What's your Fosc? If it is 12, I don't think you
> need to activate
> > PLL0,
> > > > > > if that's your CCLK speed.
> > > > > >
> > > > > >
> > > > > >
> > > > > > ssonderhoff wrote:
> > > > > > >
> > > > > > >
> > > > > > > Perhaps I should re-state the question. The
> PLLCFG and UART)
> > settings
> > > > > > > seem to be correct - Please let me know if you
> can see some
> > > > > mistake - Is
> > > > > > > there anything else that could affect UART0
> after a cclk change.
> > The
> > > > > > > port is active, but the output is garbage. Any
> thoughts would be
> > > > > welcome.
> > > > > > >
> > > > > > > --- In lpc2000@yahoogroups .com
> > ,
> > > > > > > "ssonderhoff" wrote:
> > > > > > > >
> > > > > > > > I am running the lpc2148 at a low clock speed
> of 12 mhz to
> > reduce
> > > > > > > power usage. This is working, the power
> consumption is down and
> > a
> > > > > light
> > > > > > > blinks at the correct rate. for each speed I
> reset the Uart0
> > > > > parameters
> > > > > > > to take the pclk into account (code below)
> > > > > > > >
> > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > >
> > > > > > > > At 60mhz Everything is working fine fine and
> I can read the
> > output
> > > > > > > debug text without any problem.
> > > > > > > >
> > > > > > > > At 12 mhz it outputs nothing but garbage, I
> have tried setting
> > to
> > > > > > > different baud rates from low to high with the
> same result.
> > > > > > > >
> > > > > > > > The Uart settings were determined using the
> NXP lpc2000
> > calculator
> > > > > > > >
> > > > > > > > I believe that I have faithfully followed the
> data sheet. Can
> > > > > anyone
> > > > > > > tell me what I am missing?
> > > > > > > > Thanks,
> > > > > > > > Stefan
> > > > > > > >
> > > > > > > > //*********CODE* ********* *
> > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > {
> > > > > > > >
> > > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting
> Multiplier(5) and
> > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> Multiplier(1) and
> > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > >
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> PLL to lock to set
> > > > > frequency
> > > > > > > >
> > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > }
> > > > > > > > //********** ********* ********* *********
> ********* *********
> > > > > > > ********* ***
> > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > {
> > > > > > > >
> > > > > > > >
> > > > > > > > if(speed==fast)
> > > > > > > > {
> > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> bit, DLAB = 1
> > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > U0IER = 0x00;
> > > > > > > > }
> > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > {
> > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> bit, DLAB = 1
> > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > mulval(7:4) = 12
> > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > U0LCR = 0x03;
> > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > U0IER = 0x00;
> > > > > > > > }
> > > > > > > >
> > > > > > > > }
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > --
> > > > > > Sutton Mehaffey
> >
> Start a New Thread

The board comes with the bootloader loaded and I have loaded all my firmware using the bootlader. I would hate to overwrite the bootloader and not be able to program the board. my test program puts the computer to sleep and then on wake up resets PLL or not, sets uart and then goes into a loop and contsantly prints out a string. At 60mhz everythng works and 12, not so much.
Stefan


--- In l..., "Michael Anton" wrote:
>
>
>
> > -----Original Message-----
> > From: l...
> > [mailto:l...]On Behalf
> > Of ssonderhoff
> > Sent: Monday, February 08, 2010 10:54 PM
> > To: l...
> > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > not working
> > - Any Advice would be app.
> >
> >
> >
> > Hi,
> > The system boots up using a boot loader that allows the unit
> > to act as a thumb drive and access an SD card as well as load
> > firmware updates from the sd card. This code initializes the
> > system and sets the initial PLL and is difficult and
> > dangerous for me to change. the code used to set PLL in the
> > bootloader's Boot_up and system_init routines are shown below
> > shown below:
> >
>
> Couldn't you write a piece of standalone test code, without
> the bootloader, to test your routines when running at 12MHz?
>
> >
> > void boot_up(void)
> > {
> > //Initialize the MCU clock PLL
> > system_init();
> >
> > IODIR0 |= (1 << 31);
> > IOCLR0 |= (1 << 31); //Turn on USB LED
> >
> > //Init UART0 for debug
> > PINSEL0 |= 0x00000005; //enable uart0
> > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > U0DLM = 0x00;
> > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
>
> So are you using a 58982400Hz clock, or 60MHz? If this is not
> 60MHz, you will likely encounter USB problems, as obviously you
> cannot reach 48MHz with enough accuracy either.
>
> > U0LCR = 0x03; // DLAB = 0
> >
> > //Init rprintf
> > rprintf_devopen(putc_serial0);
> > rprintf("\n\n\nUSB Bootloader v1.1\n");
> >
> > //IOSET0 |= (1 << 31); //Turn off USB LED
> > }
> >
> > /**********************************************************
> > Initialize
> > **********************************************************/
> >
> > #define PLOCK 0x400
> >
> > void system_init(void)
> > {
> > // Setting Multiplier and Divider values
> > PLLCFG=0x24;
> > feed();
> >
> > // Enabling the PLL */
> > PLLCON=0x1;
> > feed();
> >
> > // Wait for the PLL to lock to set frequency
> > while(!(PLLSTAT & PLOCK)) ;
> >
> > // Connect the PLL as the clock source
> > PLLCON=0x3;
> > feed();
> >
> > // Enabling MAM and setting number of clocks used for
> > Flash memory fetch (4 cclks in this case)
> > //MAMTIM=0x3; //VCOM?
> > MAMCR=0x2;
> > MAMTIM=0x4; //Original
>
> It may not matter, but I usually change the MAM timing values
> prior to enabling the PLL. My rational is that if the values
> are set wrong when already running at 60MHz, how could I expect
> to reliably set them? Since there is no guarantee that I can read
> from flash if they are set for a lower clock rate.
>
> >
> > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > VPBDIV=0x1;
> > }
> >
> >
>
> Like I said before, your initialization looks fine, but I suspect the
> problem you are having might be elsewhere. So it would be useful to
> see the rest of your serial port code. Perhaps there is some timing
> issue that occurs when you run 5 times slower.
>
> When I developed my UART code, I had all sorts of problems that would
> occur at times, with seemingly no explanation, until I figured out
> the problem. It was very non-obvious at the time.
>
> So, if you can, break this down into a small piece of code that
> demonstrates the problem, I'll take a look at it.
>
> Mike
>
>
>
> > --- In l..., "Michael Anton" wrote:
> > >
> > > Perhaps you could post the balance of your UART code. The
> > initialization
> > > looks fine to me.
> > >
> > > Have you tried using only 12MHz, and not going into 60MHz?
> > Just to see if
> > > it is the changing
> > > between the clock speeds that has something to do with the
> > behaviour you are
> > > seeing.
> > >
> > > Mike
> > >
> > > -----Original Message-----
> > > From: l...
> > [mailto:l...]On Behalf Of
> > > ssonderhoff
> > > Sent: Monday, February 08, 2010 8:46 PM
> > > To: l...
> > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > pclk - not working -
> > > Any Advice would be app.
> > >
> > >
> > >
> > >
> > > I will be appreciative for any insights, this is starting
> > to get quite
> > > frustrating.
> > >
> > > This is the code used to set the PLL to 60mhz. I modified
> > it to not set
> > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > going to this
> > > code all together. all gave the same result. As i mentioned earlier,
> > > everything works fine at 60mhz, where as at 12 mhz it has
> > not worked with or
> > > without setting PLL. UART settings are in the previous message
> > >
> > > Thanks again,
> > > Stefan
> > >
> > > void PLL_init(int speed)
> > > {
> > >
> > > if(speed==fast){PLLCFG=0x24;} // Setting
> > Multiplier(5) and Divider(4)
> > > so 5xosc (12mhz) = 60 mhz
> > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > >
> > > feed();
> > >
> > > PLLCON=0x1; // Enabling the PLL
> > > feed();
> > >
> > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > frequency
> > >
> > > PLLCON=0x3;// Connect the PLL as the clock source
> > > feed();
> > > }
> > > --- In l..., "ssonderhoff"
> > wrote:
> > > >
> > > > I removed the setting the PLL - after wake up I do not set PLL -
> > > > same problem - UART0 outputs garbage (see sample)
> > > >
> > > > 07*6@7*6@0w*4@0w*4.
> > > >
> > > > the light on the serial connection is blinking and the
> > junk is being
> > > output at a regular interval. these are the settings used
> > to set the baud
> > > rate to 9600 - They seem correct to me
> > > >
> > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > U0DLM = 0x00; //msb = 0
> > > > U0DLL = 0x4E; //lsb = 78
> > > > U0FCR = 0x07; // enable and reset
> > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > //VICIntEnClr = 0x00000040;
> > > > U0IER = 0x00;
> > > >
> > > > I am at a loss and would appreciate any help
> > > > Stefan
> > > >
> > > >
> > > >
> > > > --- In l..., Sutton Mehaffey sutton@ wrote:
> > > > >
> > > > > I don't turn PLL on when I use PCLK=CCLK. Mine works
> > fine. Try it and
> > > > > see if it fixes your problem. I think you only need
> > PLL on if you need
> > > > > more speed than PCLK.
> > > > >
> > > > > ssonderhoff wrote:
> > > > > >
> > > > > > Thanks for the reply. I am running at 12mhz, and
> > the I have a
> > > blinking
> > > > > > light that confirms that this is the case, along
> > with a decrease in
> > > > > > power draw. I am setting the multiplier(M) to 1. I
> > thought that you
> > > > > > had to specify the M and P values as well as select
> > the external
> > > > > > oscillator. Could this be screwing things up? How
> > does one avoid
> > > using
> > > > > > the PLL? on waking up from sleep mode, do you bother setting
> > > anything,
> > > > > > or should you actively disable the PLL by setting
> > PLLC and PLLE to
> > > 0?
> > > > > > I assume that Pclk would then = cclk.
> > > > > >
> > > > > > Thanks again for the advice
> > > > > >
> > > > > >
> > > > > > --- In l...
> > ,
> > > > > > Sutton Mehaffey wrote:
> > > > > > >
> > > > > > > What's your Fosc? If it is 12, I don't think you
> > need to activate
> > > PLL0,
> > > > > > > if that's your CCLK speed.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ssonderhoff wrote:
> > > > > > > >
> > > > > > > >
> > > > > > > > Perhaps I should re-state the question. The
> > PLLCFG and UART)
> > > settings
> > > > > > > > seem to be correct - Please let me know if you
> > can see some
> > > > > > mistake - Is
> > > > > > > > there anything else that could affect UART0
> > after a cclk change.
> > > The
> > > > > > > > port is active, but the output is garbage. Any
> > thoughts would be
> > > > > > welcome.
> > > > > > > >
> > > > > > > > --- In lpc2000@yahoogroups .com
> > > ,
> > > > > > > > "ssonderhoff" wrote:
> > > > > > > > >
> > > > > > > > > I am running the lpc2148 at a low clock speed
> > of 12 mhz to
> > > reduce
> > > > > > > > power usage. This is working, the power
> > consumption is down and
> > > a
> > > > > > light
> > > > > > > > blinks at the correct rate. for each speed I
> > reset the Uart0
> > > > > > parameters
> > > > > > > > to take the pclk into account (code below)
> > > > > > > > >
> > > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > > >
> > > > > > > > > At 60mhz Everything is working fine fine and
> > I can read the
> > > output
> > > > > > > > debug text without any problem.
> > > > > > > > >
> > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > have tried setting
> > > to
> > > > > > > > different baud rates from low to high with the
> > same result.
> > > > > > > > >
> > > > > > > > > The Uart settings were determined using the
> > NXP lpc2000
> > > calculator
> > > > > > > > >
> > > > > > > > > I believe that I have faithfully followed the
> > data sheet. Can
> > > > > > anyone
> > > > > > > > tell me what I am missing?
> > > > > > > > > Thanks,
> > > > > > > > > Stefan
> > > > > > > > >
> > > > > > > > > //*********CODE* ********* *
> > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > {
> > > > > > > > >
> > > > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting
> > Multiplier(5) and
> > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > Multiplier(1) and
> > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > >
> > > > > > > > > feed();
> > > > > > > > >
> > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > feed();
> > > > > > > > >
> > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > PLL to lock to set
> > > > > > frequency
> > > > > > > > >
> > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > feed();
> > > > > > > > >
> > > > > > > > > }
> > > > > > > > > //********** ********* ********* *********
> > ********* *********
> > > > > > > > ********* ***
> > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > {
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > if(speed==fast)
> > > > > > > > > {
> > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > bit, DLAB = 1
> > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > U0IER = 0x00;
> > > > > > > > > }
> > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > {
> > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > bit, DLAB = 1
> > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > mulval(7:4) = 12
> > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > U0LCR = 0x03;
> > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > U0IER = 0x00;
> > > > > > > > > }
> > > > > > > > >
> > > > > > > > > }
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > Sutton Mehaffey
> > >
> >
> >
> >
> >
> >
> >
> > Start a New Thread

Sir,

Thanks for the details. Please quote with shipping through EMS and clarify
if you accept Paypal.

Thanks and Regards,

Mahesh Vyas.

From: l... [mailto:l...] On Behalf Of
Michael Anton
Sent: Tuesday, February 09, 2010 12:10 PM
To: l...
Subject: RE: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk - not working
- Any Advice would be app.

> -----Original Message-----
> From: l...
> [mailto:l... ]On
Behalf
> Of ssonderhoff
> Sent: Monday, February 08, 2010 10:54 PM
> To: l...
> Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> not working
> - Any Advice would be app.
>
> Hi,
> The system boots up using a boot loader that allows the unit
> to act as a thumb drive and access an SD card as well as load
> firmware updates from the sd card. This code initializes the
> system and sets the initial PLL and is difficult and
> dangerous for me to change. the code used to set PLL in the
> bootloader's Boot_up and system_init routines are shown below
> shown below:
>

Couldn't you write a piece of standalone test code, without
the bootloader, to test your routines when running at 12MHz?

>
> void boot_up(void)
> {
> //Initialize the MCU clock PLL
> system_init();
>
> IODIR0 |= (1 << 31);
> IOCLR0 |= (1 << 31); //Turn on USB LED
>
> //Init UART0 for debug
> PINSEL0 |= 0x00000005; //enable uart0
> U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> U0DLM = 0x00;
> U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock

So are you using a 58982400Hz clock, or 60MHz? If this is not
60MHz, you will likely encounter USB problems, as obviously you
cannot reach 48MHz with enough accuracy either.

> U0LCR = 0x03; // DLAB = 0
>
> //Init rprintf
> rprintf_devopen(putc_serial0);
> rprintf("\n\n\nUSB Bootloader v1.1\n");
>
> //IOSET0 |= (1 << 31); //Turn off USB LED
> }
>
> /**********************************************************
> Initialize
> **********************************************************/
>
> #define PLOCK 0x400
>
> void system_init(void)
> {
> // Setting Multiplier and Divider values
> PLLCFG=0x24;
> feed();
>
> // Enabling the PLL */
> PLLCON=0x1;
> feed();
>
> // Wait for the PLL to lock to set frequency
> while(!(PLLSTAT & PLOCK)) ;
>
> // Connect the PLL as the clock source
> PLLCON=0x3;
> feed();
>
> // Enabling MAM and setting number of clocks used for
> Flash memory fetch (4 cclks in this case)
> //MAMTIM=0x3; //VCOM?
> MAMCR=0x2;
> MAMTIM=0x4; //Original

It may not matter, but I usually change the MAM timing values
prior to enabling the PLL. My rational is that if the values
are set wrong when already running at 60MHz, how could I expect
to reliably set them? Since there is no guarantee that I can read
from flash if they are set for a lower clock rate.

>
> // Setting peripheral Clock (pclk) to System Clock (cclk)
> VPBDIV=0x1;
> }

Like I said before, your initialization looks fine, but I suspect the
problem you are having might be elsewhere. So it would be useful to
see the rest of your serial port code. Perhaps there is some timing
issue that occurs when you run 5 times slower.

When I developed my UART code, I had all sorts of problems that would
occur at times, with seemingly no explanation, until I figured out
the problem. It was very non-obvious at the time.

So, if you can, break this down into a small piece of code that
demonstrates the problem, I'll take a look at it.

Mike

> --- In l... ,
"Michael Anton" wrote:
> >
> > Perhaps you could post the balance of your UART code. The
> initialization
> > looks fine to me.
> >
> > Have you tried using only 12MHz, and not going into 60MHz?
> Just to see if
> > it is the changing
> > between the clock speeds that has something to do with the
> behaviour you are
> > seeing.
> >
> > Mike
> >
> > -----Original Message-----
> > From: l...
> [mailto:l... ]On
Behalf Of
> > ssonderhoff
> > Sent: Monday, February 08, 2010 8:46 PM
> > To: l...
> > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> pclk - not working -
> > Any Advice would be app.
> >
> >
> >
> >
> > I will be appreciative for any insights, this is starting
> to get quite
> > frustrating.
> >
> > This is the code used to set the PLL to 60mhz. I modified
> it to not set
> > the PLL in slow mode (12mhz) on wake up and then eliminated
> going to this
> > code all together. all gave the same result. As i mentioned earlier,
> > everything works fine at 60mhz, where as at 12 mhz it has
> not worked with or
> > without setting PLL. UART settings are in the previous message
> >
> > Thanks again,
> > Stefan
> >
> > void PLL_init(int speed)
> > {
> >
> > if(speed=t){PLLCFG=0x24;} // Setting
> Multiplier(5) and Divider(4)
> > so 5xosc (12mhz) = 60 mhz
> > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> >
> > feed();
> >
> > PLLCON=0x1; // Enabling the PLL
> > feed();
> >
> > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > frequency
> >
> > PLLCON=0x3;// Connect the PLL as the clock source
> > feed();
> > }
> > --- In l... ,
"ssonderhoff"
> wrote:
> > >
> > > I removed the setting the PLL - after wake up I do not set PLL -
> > > same problem - UART0 outputs garbage (see sample)
> > >
> > > 07*6@7*6@0w*4@0w*4.
> > >
> > > the light on the serial connection is blinking and the
> junk is being
> > output at a regular interval. these are the settings used
> to set the baud
> > rate to 9600 - They seem correct to me
> > >
> > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > U0DLM = 0x00; //msb = 0
> > > U0DLL = 0x4E; //lsb = 78
> > > U0FCR = 0x07; // enable and reset
> > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > //VICIntEnClr = 0x00000040;
> > > U0IER = 0x00;
> > >
> > > I am at a loss and would appreciate any help
> > > Stefan
> > >
> > >
> > >
> > > --- In l... ,
Sutton Mehaffey sutton@ wrote:
> > > >
> > > > I don't turn PLL on when I use PCLKK. Mine works
> fine. Try it and
> > > > see if it fixes your problem. I think you only need
> PLL on if you need
> > > > more speed than PCLK.
> > > >
> > > > ssonderhoff wrote:
> > > > >
> > > > > Thanks for the reply. I am running at 12mhz, and
> the I have a
> > blinking
> > > > > light that confirms that this is the case, along
> with a decrease in
> > > > > power draw. I am setting the multiplier(M) to 1. I
> thought that you
> > > > > had to specify the M and P values as well as select
> the external
> > > > > oscillator. Could this be screwing things up? How
> does one avoid
> > using
> > > > > the PLL? on waking up from sleep mode, do you bother setting
> > anything,
> > > > > or should you actively disable the PLL by setting
> PLLC and PLLE to
> > 0?
> > > > > I assume that Pclk would then = cclk.
> > > > >
> > > > > Thanks again for the advice
> > > > >
> > > > >
> > > > > --- In l...
> ,
> > > > > Sutton Mehaffey wrote:
> > > > > >
> > > > > > What's your Fosc? If it is 12, I don't think you
> need to activate
> > PLL0,
> > > > > > if that's your CCLK speed.
> > > > > >
> > > > > >
> > > > > >
> > > > > > ssonderhoff wrote:
> > > > > > >
> > > > > > >
> > > > > > > Perhaps I should re-state the question. The
> PLLCFG and UART)
> > settings
> > > > > > > seem to be correct - Please let me know if you
> can see some
> > > > > mistake - Is
> > > > > > > there anything else that could affect UART0
> after a cclk change.
> > The
> > > > > > > port is active, but the output is garbage. Any
> thoughts would be
> > > > > welcome.
> > > > > > >
> > > > > > > --- In lpc2000@yahoogroups .com
> > ,
> > > > > > > "ssonderhoff" wrote:
> > > > > > > >
> > > > > > > > I am running the lpc2148 at a low clock speed
> of 12 mhz to
> > reduce
> > > > > > > power usage. This is working, the power
> consumption is down and
> > a
> > > > > light
> > > > > > > blinks at the correct rate. for each speed I
> reset the Uart0
> > > > > parameters
> > > > > > > to take the pclk into account (code below)
> > > > > > > >
> > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > >
> > > > > > > > At 60mhz Everything is working fine fine and
> I can read the
> > output
> > > > > > > debug text without any problem.
> > > > > > > >
> > > > > > > > At 12 mhz it outputs nothing but garbage, I
> have tried setting
> > to
> > > > > > > different baud rates from low to high with the
> same result.
> > > > > > > >
> > > > > > > > The Uart settings were determined using the
> NXP lpc2000
> > calculator
> > > > > > > >
> > > > > > > > I believe that I have faithfully followed the
> data sheet. Can
> > > > > anyone
> > > > > > > tell me what I am missing?
> > > > > > > > Thanks,
> > > > > > > > Stefan
> > > > > > > >
> > > > > > > > //*********CODE* ********* *
> > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > {
> > > > > > > >
> > > > > > > > if(speed=t) {PLLCFG=0x24; } // Setting
> Multiplier(5) and
> > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> Multiplier(1) and
> > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > >
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> PLL to lock to set
> > > > > frequency
> > > > > > > >
> > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > }
> > > > > > > > //********** ********* ********* *********
> ********* *********
> > > > > > > ********* ***
> > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > {
> > > > > > > >
> > > > > > > >
> > > > > > > > if(speed=t)
> > > > > > > > {
> > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> bit, DLAB = 1
> > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > U0IER = 0x00;
> > > > > > > > }
> > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > {
> > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> bit, DLAB = 1
> > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > mulval(7:4) = 12
> > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > U0LCR = 0x03;
> > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > U0IER = 0x00;
> > > > > > > > }
> > > > > > > >
> > > > > > > > }
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > --
> > > > > > Sutton Mehaffey
> >
>
>
> Yahoo! Groups Links
> Start a New Thread

Though I am not sure why. It turns out that if you shut off the PLL and change UART) settings before you put the system to sleep, then the output is the desired text. If you go to sleep and then run the identical code the output is the garbled nonsense I was getting. Any Ideas why this might be the case?
Thanks All,
Stefan

--- In l..., "ssonderhoff" wrote:
>
>
> The board comes with the bootloader loaded and I have loaded all my firmware using the bootlader. I would hate to overwrite the bootloader and not be able to program the board. my test program puts the computer to sleep and then on wake up resets PLL or not, sets uart and then goes into a loop and contsantly prints out a string. At 60mhz everythng works and 12, not so much.
> Stefan
>
>
> --- In l..., "Michael Anton" wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: l...
> > > [mailto:l...]On Behalf
> > > Of ssonderhoff
> > > Sent: Monday, February 08, 2010 10:54 PM
> > > To: l...
> > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > not working
> > > - Any Advice would be app.
> > >
> > >
> > >
> > > Hi,
> > > The system boots up using a boot loader that allows the unit
> > > to act as a thumb drive and access an SD card as well as load
> > > firmware updates from the sd card. This code initializes the
> > > system and sets the initial PLL and is difficult and
> > > dangerous for me to change. the code used to set PLL in the
> > > bootloader's Boot_up and system_init routines are shown below
> > > shown below:
> > >
> >
> > Couldn't you write a piece of standalone test code, without
> > the bootloader, to test your routines when running at 12MHz?
> >
> > >
> > > void boot_up(void)
> > > {
> > > //Initialize the MCU clock PLL
> > > system_init();
> > >
> > > IODIR0 |= (1 << 31);
> > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > >
> > > //Init UART0 for debug
> > > PINSEL0 |= 0x00000005; //enable uart0
> > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > U0DLM = 0x00;
> > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> >
> > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > 60MHz, you will likely encounter USB problems, as obviously you
> > cannot reach 48MHz with enough accuracy either.
> >
> > > U0LCR = 0x03; // DLAB = 0
> > >
> > > //Init rprintf
> > > rprintf_devopen(putc_serial0);
> > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > >
> > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > }
> > >
> > > /**********************************************************
> > > Initialize
> > > **********************************************************/
> > >
> > > #define PLOCK 0x400
> > >
> > > void system_init(void)
> > > {
> > > // Setting Multiplier and Divider values
> > > PLLCFG=0x24;
> > > feed();
> > >
> > > // Enabling the PLL */
> > > PLLCON=0x1;
> > > feed();
> > >
> > > // Wait for the PLL to lock to set frequency
> > > while(!(PLLSTAT & PLOCK)) ;
> > >
> > > // Connect the PLL as the clock source
> > > PLLCON=0x3;
> > > feed();
> > >
> > > // Enabling MAM and setting number of clocks used for
> > > Flash memory fetch (4 cclks in this case)
> > > //MAMTIM=0x3; //VCOM?
> > > MAMCR=0x2;
> > > MAMTIM=0x4; //Original
> >
> > It may not matter, but I usually change the MAM timing values
> > prior to enabling the PLL. My rational is that if the values
> > are set wrong when already running at 60MHz, how could I expect
> > to reliably set them? Since there is no guarantee that I can read
> > from flash if they are set for a lower clock rate.
> >
> > >
> > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > VPBDIV=0x1;
> > > }
> > >
> > >
> >
> > Like I said before, your initialization looks fine, but I suspect the
> > problem you are having might be elsewhere. So it would be useful to
> > see the rest of your serial port code. Perhaps there is some timing
> > issue that occurs when you run 5 times slower.
> >
> > When I developed my UART code, I had all sorts of problems that would
> > occur at times, with seemingly no explanation, until I figured out
> > the problem. It was very non-obvious at the time.
> >
> > So, if you can, break this down into a small piece of code that
> > demonstrates the problem, I'll take a look at it.
> >
> > Mike
> >
> >
> >
> > > --- In l..., "Michael Anton" wrote:
> > > >
> > > > Perhaps you could post the balance of your UART code. The
> > > initialization
> > > > looks fine to me.
> > > >
> > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > Just to see if
> > > > it is the changing
> > > > between the clock speeds that has something to do with the
> > > behaviour you are
> > > > seeing.
> > > >
> > > > Mike
> > > >
> > > > -----Original Message-----
> > > > From: l...
> > > [mailto:l...]On Behalf Of
> > > > ssonderhoff
> > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > To: l...
> > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > pclk - not working -
> > > > Any Advice would be app.
> > > >
> > > >
> > > >
> > > >
> > > > I will be appreciative for any insights, this is starting
> > > to get quite
> > > > frustrating.
> > > >
> > > > This is the code used to set the PLL to 60mhz. I modified
> > > it to not set
> > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > going to this
> > > > code all together. all gave the same result. As i mentioned earlier,
> > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > not worked with or
> > > > without setting PLL. UART settings are in the previous message
> > > >
> > > > Thanks again,
> > > > Stefan
> > > >
> > > > void PLL_init(int speed)
> > > > {
> > > >
> > > > if(speed==fast){PLLCFG=0x24;} // Setting
> > > Multiplier(5) and Divider(4)
> > > > so 5xosc (12mhz) = 60 mhz
> > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > >
> > > > feed();
> > > >
> > > > PLLCON=0x1; // Enabling the PLL
> > > > feed();
> > > >
> > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > frequency
> > > >
> > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > feed();
> > > > }
> > > > --- In l..., "ssonderhoff"
> > > wrote:
> > > > >
> > > > > I removed the setting the PLL - after wake up I do not set PLL -
> > > > > same problem - UART0 outputs garbage (see sample)
> > > > >
> > > > > 07*6@7*6@0w*4@0w*4.
> > > > >
> > > > > the light on the serial connection is blinking and the
> > > junk is being
> > > > output at a regular interval. these are the settings used
> > > to set the baud
> > > > rate to 9600 - They seem correct to me
> > > > >
> > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > U0DLM = 0x00; //msb = 0
> > > > > U0DLL = 0x4E; //lsb = 78
> > > > > U0FCR = 0x07; // enable and reset
> > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > //VICIntEnClr = 0x00000040;
> > > > > U0IER = 0x00;
> > > > >
> > > > > I am at a loss and would appreciate any help
> > > > > Stefan
> > > > >
> > > > >
> > > > >
> > > > > --- In l..., Sutton Mehaffey sutton@ wrote:
> > > > > >
> > > > > > I don't turn PLL on when I use PCLK=CCLK. Mine works
> > > fine. Try it and
> > > > > > see if it fixes your problem. I think you only need
> > > PLL on if you need
> > > > > > more speed than PCLK.
> > > > > >
> > > > > > ssonderhoff wrote:
> > > > > > >
> > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > the I have a
> > > > blinking
> > > > > > > light that confirms that this is the case, along
> > > with a decrease in
> > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > thought that you
> > > > > > > had to specify the M and P values as well as select
> > > the external
> > > > > > > oscillator. Could this be screwing things up? How
> > > does one avoid
> > > > using
> > > > > > > the PLL? on waking up from sleep mode, do you bother setting
> > > > anything,
> > > > > > > or should you actively disable the PLL by setting
> > > PLLC and PLLE to
> > > > 0?
> > > > > > > I assume that Pclk would then = cclk.
> > > > > > >
> > > > > > > Thanks again for the advice
> > > > > > >
> > > > > > >
> > > > > > > --- In l...
> > > ,
> > > > > > > Sutton Mehaffey wrote:
> > > > > > > >
> > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > need to activate
> > > > PLL0,
> > > > > > > > if that's your CCLK speed.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > ssonderhoff wrote:
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Perhaps I should re-state the question. The
> > > PLLCFG and UART)
> > > > settings
> > > > > > > > > seem to be correct - Please let me know if you
> > > can see some
> > > > > > > mistake - Is
> > > > > > > > > there anything else that could affect UART0
> > > after a cclk change.
> > > > The
> > > > > > > > > port is active, but the output is garbage. Any
> > > thoughts would be
> > > > > > > welcome.
> > > > > > > > >
> > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > ,
> > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > >
> > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > of 12 mhz to
> > > > reduce
> > > > > > > > > power usage. This is working, the power
> > > consumption is down and
> > > > a
> > > > > > > light
> > > > > > > > > blinks at the correct rate. for each speed I
> > > reset the Uart0
> > > > > > > parameters
> > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > >
> > > > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > > > >
> > > > > > > > > > At 60mhz Everything is working fine fine and
> > > I can read the
> > > > output
> > > > > > > > > debug text without any problem.
> > > > > > > > > >
> > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > have tried setting
> > > > to
> > > > > > > > > different baud rates from low to high with the
> > > same result.
> > > > > > > > > >
> > > > > > > > > > The Uart settings were determined using the
> > > NXP lpc2000
> > > > calculator
> > > > > > > > > >
> > > > > > > > > > I believe that I have faithfully followed the
> > > data sheet. Can
> > > > > > > anyone
> > > > > > > > > tell me what I am missing?
> > > > > > > > > > Thanks,
> > > > > > > > > > Stefan
> > > > > > > > > >
> > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > {
> > > > > > > > > >
> > > > > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting
> > > Multiplier(5) and
> > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > Multiplier(1) and
> > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > >
> > > > > > > > > > feed();
> > > > > > > > > >
> > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > feed();
> > > > > > > > > >
> > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > PLL to lock to set
> > > > > > > frequency
> > > > > > > > > >
> > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > > feed();
> > > > > > > > > >
> > > > > > > > > > }
> > > > > > > > > > //********** ********* ********* *********
> > > ********* *********
> > > > > > > > > ********* ***
> > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > {
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > if(speed==fast)
> > > > > > > > > > {
> > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > bit, DLAB = 1
> > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > }
> > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > {
> > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > bit, DLAB = 1
> > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > > mulval(7:4) = 12
> > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > > --
> > > > > > > > Sutton Mehaffey
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Start a New Thread

How are you waking the system back up? Pressing reset?

ssonderhoff wrote:
>
>
> Though I am not sure why. It turns out that if you shut off the PLL and
> change UART) settings before you put the system to sleep, then the
> output is the desired text. If you go to sleep and then run the
> identical code the output is the garbled nonsense I was getting. Any
> Ideas why this might be the case?
> Thanks All,
> Stefan
>
> --- In l... ,
> "ssonderhoff" wrote:
> >
> >
> > The board comes with the bootloader loaded and I have loaded all my
> firmware using the bootlader. I would hate to overwrite the bootloader
> and not be able to program the board. my test program puts the computer
> to sleep and then on wake up resets PLL or not, sets uart and then goes
> into a loop and contsantly prints out a string. At 60mhz everythng works
> and 12, not so much.
> > Stefan
> >
> >
> > --- In l... ,
> "Michael Anton" wrote:
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: l...
> > > > [mailto:l...
> ]On Behalf
> > > > Of ssonderhoff
> > > > Sent: Monday, February 08, 2010 10:54 PM
> > > > To: l...
> > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > > not working
> > > > - Any Advice would be app.
> > > >
> > > >
> > > >
> > > > Hi,
> > > > The system boots up using a boot loader that allows the unit
> > > > to act as a thumb drive and access an SD card as well as load
> > > > firmware updates from the sd card. This code initializes the
> > > > system and sets the initial PLL and is difficult and
> > > > dangerous for me to change. the code used to set PLL in the
> > > > bootloader's Boot_up and system_init routines are shown below
> > > > shown below:
> > > >
> > >
> > > Couldn't you write a piece of standalone test code, without
> > > the bootloader, to test your routines when running at 12MHz?
> > >
> > > >
> > > > void boot_up(void)
> > > > {
> > > > //Initialize the MCU clock PLL
> > > > system_init();
> > > >
> > > > IODIR0 |= (1 << 31);
> > > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > > >
> > > > //Init UART0 for debug
> > > > PINSEL0 |= 0x00000005; //enable uart0
> > > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > > U0DLM = 0x00;
> > > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> > >
> > > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > > 60MHz, you will likely encounter USB problems, as obviously you
> > > cannot reach 48MHz with enough accuracy either.
> > >
> > > > U0LCR = 0x03; // DLAB = 0
> > > >
> > > > //Init rprintf
> > > > rprintf_devopen(putc_serial0);
> > > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > > >
> > > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > > }
> > > >
> > > > /**********************************************************
> > > > Initialize
> > > > **********************************************************/
> > > >
> > > > #define PLOCK 0x400
> > > >
> > > > void system_init(void)
> > > > {
> > > > // Setting Multiplier and Divider values
> > > > PLLCFG=0x24;
> > > > feed();
> > > >
> > > > // Enabling the PLL */
> > > > PLLCON=0x1;
> > > > feed();
> > > >
> > > > // Wait for the PLL to lock to set frequency
> > > > while(!(PLLSTAT & PLOCK)) ;
> > > >
> > > > // Connect the PLL as the clock source
> > > > PLLCON=0x3;
> > > > feed();
> > > >
> > > > // Enabling MAM and setting number of clocks used for
> > > > Flash memory fetch (4 cclks in this case)
> > > > //MAMTIM=0x3; //VCOM?
> > > > MAMCR=0x2;
> > > > MAMTIM=0x4; //Original
> > >
> > > It may not matter, but I usually change the MAM timing values
> > > prior to enabling the PLL. My rational is that if the values
> > > are set wrong when already running at 60MHz, how could I expect
> > > to reliably set them? Since there is no guarantee that I can read
> > > from flash if they are set for a lower clock rate.
> > >
> > > >
> > > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > > VPBDIV=0x1;
> > > > }
> > > >
> > > >
> > >
> > > Like I said before, your initialization looks fine, but I suspect the
> > > problem you are having might be elsewhere. So it would be useful to
> > > see the rest of your serial port code. Perhaps there is some timing
> > > issue that occurs when you run 5 times slower.
> > >
> > > When I developed my UART code, I had all sorts of problems that would
> > > occur at times, with seemingly no explanation, until I figured out
> > > the problem. It was very non-obvious at the time.
> > >
> > > So, if you can, break this down into a small piece of code that
> > > demonstrates the problem, I'll take a look at it.
> > >
> > > Mike
> > >
> > >
> > >
> > > > --- In l...
> , "Michael Anton" wrote:
> > > > >
> > > > > Perhaps you could post the balance of your UART code. The
> > > > initialization
> > > > > looks fine to me.
> > > > >
> > > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > > Just to see if
> > > > > it is the changing
> > > > > between the clock speeds that has something to do with the
> > > > behaviour you are
> > > > > seeing.
> > > > >
> > > > > Mike
> > > > >
> > > > > -----Original Message-----
> > > > > From: l...
> > > > [mailto:l...
> ]On Behalf Of
> > > > > ssonderhoff
> > > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > > To: l...
> > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > > pclk - not working -
> > > > > Any Advice would be app.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > I will be appreciative for any insights, this is starting
> > > > to get quite
> > > > > frustrating.
> > > > >
> > > > > This is the code used to set the PLL to 60mhz. I modified
> > > > it to not set
> > > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > > going to this
> > > > > code all together. all gave the same result. As i mentioned
> earlier,
> > > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > > not worked with or
> > > > > without setting PLL. UART settings are in the previous message
> > > > >
> > > > > Thanks again,
> > > > > Stefan
> > > > >
> > > > > void PLL_init(int speed)
> > > > > {
> > > > >
> > > > > if(speed=t){PLLCFG=0x24;} // Setting
> > > > Multiplier(5) and Divider(4)
> > > > > so 5xosc (12mhz) = 60 mhz
> > > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > > >
> > > > > feed();
> > > > >
> > > > > PLLCON=0x1; // Enabling the PLL
> > > > > feed();
> > > > >
> > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > > frequency
> > > > >
> > > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > > feed();
> > > > > }
> > > > > --- In l...
> , "ssonderhoff"
> > > > wrote:
> > > > > >
> > > > > > I removed the setting the PLL - after wake up I do not set PLL -
> > > > > > same problem - UART0 outputs garbage (see sample)
> > > > > >
> > > > > > 07*6@7*6@0w*4@0w*4.
> > > > > >
> > > > > > the light on the serial connection is blinking and the
> > > > junk is being
> > > > > output at a regular interval. these are the settings used
> > > > to set the baud
> > > > > rate to 9600 - They seem correct to me
> > > > > >
> > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > U0DLM = 0x00; //msb = 0
> > > > > > U0DLL = 0x4E; //lsb = 78
> > > > > > U0FCR = 0x07; // enable and reset
> > > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > > //VICIntEnClr = 0x00000040;
> > > > > > U0IER = 0x00;
> > > > > >
> > > > > > I am at a loss and would appreciate any help
> > > > > > Stefan
> > > > > >
> > > > > >
> > > > > >
> > > > > > --- In l...
> , Sutton Mehaffey sutton@ wrote:
> > > > > > >
> > > > > > > I don't turn PLL on when I use PCLKK. Mine works
> > > > fine. Try it and
> > > > > > > see if it fixes your problem. I think you only need
> > > > PLL on if you need
> > > > > > > more speed than PCLK.
> > > > > > >
> > > > > > > ssonderhoff wrote:
> > > > > > > >
> > > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > > the I have a
> > > > > blinking
> > > > > > > > light that confirms that this is the case, along
> > > > with a decrease in
> > > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > > thought that you
> > > > > > > > had to specify the M and P values as well as select
> > > > the external
> > > > > > > > oscillator. Could this be screwing things up? How
> > > > does one avoid
> > > > > using
> > > > > > > > the PLL? on waking up from sleep mode, do you bother setting
> > > > > anything,
> > > > > > > > or should you actively disable the PLL by setting
> > > > PLLC and PLLE to
> > > > > 0?
> > > > > > > > I assume that Pclk would then = cclk.
> > > > > > > >
> > > > > > > > Thanks again for the advice
> > > > > > > >
> > > > > > > >
> > > > > > > > --- In l...
>
> > > > ,
> > > > > > > > Sutton Mehaffey wrote:
> > > > > > > > >
> > > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > > need to activate
> > > > > PLL0,
> > > > > > > > > if that's your CCLK speed.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > ssonderhoff wrote:
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Perhaps I should re-state the question. The
> > > > PLLCFG and UART)
> > > > > settings
> > > > > > > > > > seem to be correct - Please let me know if you
> > > > can see some
> > > > > > > > mistake - Is
> > > > > > > > > > there anything else that could affect UART0
> > > > after a cclk change.
> > > > > The
> > > > > > > > > > port is active, but the output is garbage. Any
> > > > thoughts would be
> > > > > > > > welcome.
> > > > > > > > > >
> > > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > > ,
> > > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > > >
> > > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > > of 12 mhz to
> > > > > reduce
> > > > > > > > > > power usage. This is working, the power
> > > > consumption is down and
> > > > > a
> > > > > > > > light
> > > > > > > > > > blinks at the correct rate. for each speed I
> > > > reset the Uart0
> > > > > > > > parameters
> > > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > > >
> > > > > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > > > > >
> > > > > > > > > > > At 60mhz Everything is working fine fine and
> > > > I can read the
> > > > > output
> > > > > > > > > > debug text without any problem.
> > > > > > > > > > >
> > > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > > have tried setting
> > > > > to
> > > > > > > > > > different baud rates from low to high with the
> > > > same result.
> > > > > > > > > > >
> > > > > > > > > > > The Uart settings were determined using the
> > > > NXP lpc2000
> > > > > calculator
> > > > > > > > > > >
> > > > > > > > > > > I believe that I have faithfully followed the
> > > > data sheet. Can
> > > > > > > > anyone
> > > > > > > > > > tell me what I am missing?
> > > > > > > > > > > Thanks,
> > > > > > > > > > > Stefan
> > > > > > > > > > >
> > > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > > {
> > > > > > > > > > >
> > > > > > > > > > > if(speed=t) {PLLCFG=0x24; } // Setting
> > > > Multiplier(5) and
> > > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > > Multiplier(1) and
> > > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > > >
> > > > > > > > > > > feed();
> > > > > > > > > > >
> > > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > > feed();
> > > > > > > > > > >
> > > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > > PLL to lock to set
> > > > > > > > frequency
> > > > > > > > > > >
> > > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > > > feed();
> > > > > > > > > > >
> > > > > > > > > > > }
> > > > > > > > > > > //********** ********* ********* *********
> > > > ********* *********
> > > > > > > > > > ********* ***
> > > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > > {
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > if(speed=t)
> > > > > > > > > > > {
> > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > bit, DLAB = 1
> > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > }
> > > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > > {
> > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > bit, DLAB = 1
> > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > > > mulval(7:4) = 12
> > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > > > }
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > > --
> > > > > > > > > Sutton Mehaffey
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Start a New Thread

I am using EINT3 (non vectored).

Once cclk was changed to 12 mhz before going to sleep, the uart0 worked fine before and after sleep. I have changed the baud rate up to 115200 and it still is working fine.

--- In l..., Sutton Mehaffey wrote:
>
> How are you waking the system back up? Pressing reset?
>
>
>
> ssonderhoff wrote:
> >
> >
> > Though I am not sure why. It turns out that if you shut off the PLL and
> > change UART) settings before you put the system to sleep, then the
> > output is the desired text. If you go to sleep and then run the
> > identical code the output is the garbled nonsense I was getting. Any
> > Ideas why this might be the case?
> > Thanks All,
> > Stefan
> >
> > --- In l... ,
> > "ssonderhoff" wrote:
> > >
> > >
> > > The board comes with the bootloader loaded and I have loaded all my
> > firmware using the bootlader. I would hate to overwrite the bootloader
> > and not be able to program the board. my test program puts the computer
> > to sleep and then on wake up resets PLL or not, sets uart and then goes
> > into a loop and contsantly prints out a string. At 60mhz everythng works
> > and 12, not so much.
> > > Stefan
> > >
> > >
> > > --- In l... ,
> > "Michael Anton" wrote:
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: l...
> > > > > [mailto:l...
> > ]On Behalf
> > > > > Of ssonderhoff
> > > > > Sent: Monday, February 08, 2010 10:54 PM
> > > > > To: l...
> > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > > > not working
> > > > > - Any Advice would be app.
> > > > >
> > > > >
> > > > >
> > > > > Hi,
> > > > > The system boots up using a boot loader that allows the unit
> > > > > to act as a thumb drive and access an SD card as well as load
> > > > > firmware updates from the sd card. This code initializes the
> > > > > system and sets the initial PLL and is difficult and
> > > > > dangerous for me to change. the code used to set PLL in the
> > > > > bootloader's Boot_up and system_init routines are shown below
> > > > > shown below:
> > > > >
> > > >
> > > > Couldn't you write a piece of standalone test code, without
> > > > the bootloader, to test your routines when running at 12MHz?
> > > >
> > > > >
> > > > > void boot_up(void)
> > > > > {
> > > > > //Initialize the MCU clock PLL
> > > > > system_init();
> > > > >
> > > > > IODIR0 |= (1 << 31);
> > > > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > > > >
> > > > > //Init UART0 for debug
> > > > > PINSEL0 |= 0x00000005; //enable uart0
> > > > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > > > U0DLM = 0x00;
> > > > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> > > >
> > > > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > > > 60MHz, you will likely encounter USB problems, as obviously you
> > > > cannot reach 48MHz with enough accuracy either.
> > > >
> > > > > U0LCR = 0x03; // DLAB = 0
> > > > >
> > > > > //Init rprintf
> > > > > rprintf_devopen(putc_serial0);
> > > > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > > > >
> > > > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > > > }
> > > > >
> > > > > /**********************************************************
> > > > > Initialize
> > > > > **********************************************************/
> > > > >
> > > > > #define PLOCK 0x400
> > > > >
> > > > > void system_init(void)
> > > > > {
> > > > > // Setting Multiplier and Divider values
> > > > > PLLCFG=0x24;
> > > > > feed();
> > > > >
> > > > > // Enabling the PLL */
> > > > > PLLCON=0x1;
> > > > > feed();
> > > > >
> > > > > // Wait for the PLL to lock to set frequency
> > > > > while(!(PLLSTAT & PLOCK)) ;
> > > > >
> > > > > // Connect the PLL as the clock source
> > > > > PLLCON=0x3;
> > > > > feed();
> > > > >
> > > > > // Enabling MAM and setting number of clocks used for
> > > > > Flash memory fetch (4 cclks in this case)
> > > > > //MAMTIM=0x3; //VCOM?
> > > > > MAMCR=0x2;
> > > > > MAMTIM=0x4; //Original
> > > >
> > > > It may not matter, but I usually change the MAM timing values
> > > > prior to enabling the PLL. My rational is that if the values
> > > > are set wrong when already running at 60MHz, how could I expect
> > > > to reliably set them? Since there is no guarantee that I can read
> > > > from flash if they are set for a lower clock rate.
> > > >
> > > > >
> > > > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > > > VPBDIV=0x1;
> > > > > }
> > > > >
> > > > >
> > > >
> > > > Like I said before, your initialization looks fine, but I suspect the
> > > > problem you are having might be elsewhere. So it would be useful to
> > > > see the rest of your serial port code. Perhaps there is some timing
> > > > issue that occurs when you run 5 times slower.
> > > >
> > > > When I developed my UART code, I had all sorts of problems that would
> > > > occur at times, with seemingly no explanation, until I figured out
> > > > the problem. It was very non-obvious at the time.
> > > >
> > > > So, if you can, break this down into a small piece of code that
> > > > demonstrates the problem, I'll take a look at it.
> > > >
> > > > Mike
> > > >
> > > >
> > > >
> > > > > --- In l...
> > , "Michael Anton" wrote:
> > > > > >
> > > > > > Perhaps you could post the balance of your UART code. The
> > > > > initialization
> > > > > > looks fine to me.
> > > > > >
> > > > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > > > Just to see if
> > > > > > it is the changing
> > > > > > between the clock speeds that has something to do with the
> > > > > behaviour you are
> > > > > > seeing.
> > > > > >
> > > > > > Mike
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: l...
> > > > > [mailto:l...
> > ]On Behalf Of
> > > > > > ssonderhoff
> > > > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > > > To: l...
> > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > > > pclk - not working -
> > > > > > Any Advice would be app.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > I will be appreciative for any insights, this is starting
> > > > > to get quite
> > > > > > frustrating.
> > > > > >
> > > > > > This is the code used to set the PLL to 60mhz. I modified
> > > > > it to not set
> > > > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > > > going to this
> > > > > > code all together. all gave the same result. As i mentioned
> > earlier,
> > > > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > > > not worked with or
> > > > > > without setting PLL. UART settings are in the previous message
> > > > > >
> > > > > > Thanks again,
> > > > > > Stefan
> > > > > >
> > > > > > void PLL_init(int speed)
> > > > > > {
> > > > > >
> > > > > > if(speed==fast){PLLCFG=0x24;} // Setting
> > > > > Multiplier(5) and Divider(4)
> > > > > > so 5xosc (12mhz) = 60 mhz
> > > > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > > > >
> > > > > > feed();
> > > > > >
> > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > feed();
> > > > > >
> > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > > > frequency
> > > > > >
> > > > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > > > feed();
> > > > > > }
> > > > > > --- In l...
> > , "ssonderhoff"
> > > > > wrote:
> > > > > > >
> > > > > > > I removed the setting the PLL - after wake up I do not set PLL -
> > > > > > > same problem - UART0 outputs garbage (see sample)
> > > > > > >
> > > > > > > 07*6@7*6@0w*4@0w*4.
> > > > > > >
> > > > > > > the light on the serial connection is blinking and the
> > > > > junk is being
> > > > > > output at a regular interval. these are the settings used
> > > > > to set the baud
> > > > > > rate to 9600 - They seem correct to me
> > > > > > >
> > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > U0DLL = 0x4E; //lsb = 78
> > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > > > //VICIntEnClr = 0x00000040;
> > > > > > > U0IER = 0x00;
> > > > > > >
> > > > > > > I am at a loss and would appreciate any help
> > > > > > > Stefan
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --- In l...
> > , Sutton Mehaffey sutton@ wrote:
> > > > > > > >
> > > > > > > > I don't turn PLL on when I use PCLK=CCLK. Mine works
> > > > > fine. Try it and
> > > > > > > > see if it fixes your problem. I think you only need
> > > > > PLL on if you need
> > > > > > > > more speed than PCLK.
> > > > > > > >
> > > > > > > > ssonderhoff wrote:
> > > > > > > > >
> > > > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > > > the I have a
> > > > > > blinking
> > > > > > > > > light that confirms that this is the case, along
> > > > > with a decrease in
> > > > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > > > thought that you
> > > > > > > > > had to specify the M and P values as well as select
> > > > > the external
> > > > > > > > > oscillator. Could this be screwing things up? How
> > > > > does one avoid
> > > > > > using
> > > > > > > > > the PLL? on waking up from sleep mode, do you bother setting
> > > > > > anything,
> > > > > > > > > or should you actively disable the PLL by setting
> > > > > PLLC and PLLE to
> > > > > > 0?
> > > > > > > > > I assume that Pclk would then = cclk.
> > > > > > > > >
> > > > > > > > > Thanks again for the advice
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > --- In l...
> >
> > > > > ,
> > > > > > > > > Sutton Mehaffey wrote:
> > > > > > > > > >
> > > > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > > > need to activate
> > > > > > PLL0,
> > > > > > > > > > if that's your CCLK speed.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Perhaps I should re-state the question. The
> > > > > PLLCFG and UART)
> > > > > > settings
> > > > > > > > > > > seem to be correct - Please let me know if you
> > > > > can see some
> > > > > > > > > mistake - Is
> > > > > > > > > > > there anything else that could affect UART0
> > > > > after a cclk change.
> > > > > > The
> > > > > > > > > > > port is active, but the output is garbage. Any
> > > > > thoughts would be
> > > > > > > > > welcome.
> > > > > > > > > > >
> > > > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > > > ,
> > > > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > > > of 12 mhz to
> > > > > > reduce
> > > > > > > > > > > power usage. This is working, the power
> > > > > consumption is down and
> > > > > > a
> > > > > > > > > light
> > > > > > > > > > > blinks at the correct rate. for each speed I
> > > > > reset the Uart0
> > > > > > > > > parameters
> > > > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > > > >
> > > > > > > > > > > > the PLL_int(code below) sets processor to 12mhz(slow).
> > > > > > > > > > > >
> > > > > > > > > > > > At 60mhz Everything is working fine fine and
> > > > > I can read the
> > > > > > output
> > > > > > > > > > > debug text without any problem.
> > > > > > > > > > > >
> > > > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > > > have tried setting
> > > > > > to
> > > > > > > > > > > different baud rates from low to high with the
> > > > > same result.
> > > > > > > > > > > >
> > > > > > > > > > > > The Uart settings were determined using the
> > > > > NXP lpc2000
> > > > > > calculator
> > > > > > > > > > > >
> > > > > > > > > > > > I believe that I have faithfully followed the
> > > > > data sheet. Can
> > > > > > > > > anyone
> > > > > > > > > > > tell me what I am missing?
> > > > > > > > > > > > Thanks,
> > > > > > > > > > > > Stefan
> > > > > > > > > > > >
> > > > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > > > {
> > > > > > > > > > > >
> > > > > > > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting
> > > > > Multiplier(5) and
> > > > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > > > Multiplier(1) and
> > > > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > > > >
> > > > > > > > > > > > feed();
> > > > > > > > > > > >
> > > > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > > > feed();
> > > > > > > > > > > >
> > > > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > > > PLL to lock to set
> > > > > > > > > frequency
> > > > > > > > > > > >
> > > > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > > > > feed();
> > > > > > > > > > > >
> > > > > > > > > > > > }
> > > > > > > > > > > > //********** ********* ********* *********
> > > > > ********* *********
> > > > > > > > > > > ********* ***
> > > > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > > > {
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > if(speed==fast)
> > > > > > > > > > > > {
> > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > bit, DLAB = 1
> > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > }
> > > > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > > > {
> > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > bit, DLAB = 1
> > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > > > > mulval(7:4) = 12
> > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > }
> > > > > > > > > > > >
> > > > > > > > > > > > }
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > Sutton Mehaffey
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Start a New Thread

I don't think that interrupt resets the PLL does it? You might need to
reset it to OFF manually.

ssonderhoff wrote:
>
>
> I am using EINT3 (non vectored).
>
> Once cclk was changed to 12 mhz before going to sleep, the uart0 worked
> fine before and after sleep. I have changed the baud rate up to 115200
> and it still is working fine.
>
> --- In l... ,
> Sutton Mehaffey wrote:
> >
> > How are you waking the system back up? Pressing reset?
> >
> >
> >
> > ssonderhoff wrote:
> > >
> > >
> > > Though I am not sure why. It turns out that if you shut off the PLL
> and
> > > change UART) settings before you put the system to sleep, then the
> > > output is the desired text. If you go to sleep and then run the
> > > identical code the output is the garbled nonsense I was getting. Any
> > > Ideas why this might be the case?
> > > Thanks All,
> > > Stefan
> > >
> > > --- In l...
> ,
> > > "ssonderhoff" wrote:
> > > >
> > > >
> > > > The board comes with the bootloader loaded and I have loaded all my
> > > firmware using the bootlader. I would hate to overwrite the bootloader
> > > and not be able to program the board. my test program puts the
> computer
> > > to sleep and then on wake up resets PLL or not, sets uart and then
> goes
> > > into a loop and contsantly prints out a string. At 60mhz everythng
> works
> > > and 12, not so much.
> > > > Stefan
> > > >
> > > >
> > > > --- In l...
> ,
> > > "Michael Anton" wrote:
> > > > >
> > > > >
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: l...
>
> > > > > > [mailto:l...
>
> > > ]On Behalf
> > > > > > Of ssonderhoff
> > > > > > Sent: Monday, February 08, 2010 10:54 PM
> > > > > > To: l...
>
> > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > > > > not working
> > > > > > - Any Advice would be app.
> > > > > >
> > > > > >
> > > > > >
> > > > > > Hi,
> > > > > > The system boots up using a boot loader that allows the unit
> > > > > > to act as a thumb drive and access an SD card as well as load
> > > > > > firmware updates from the sd card. This code initializes the
> > > > > > system and sets the initial PLL and is difficult and
> > > > > > dangerous for me to change. the code used to set PLL in the
> > > > > > bootloader's Boot_up and system_init routines are shown below
> > > > > > shown below:
> > > > > >
> > > > >
> > > > > Couldn't you write a piece of standalone test code, without
> > > > > the bootloader, to test your routines when running at 12MHz?
> > > > >
> > > > > >
> > > > > > void boot_up(void)
> > > > > > {
> > > > > > //Initialize the MCU clock PLL
> > > > > > system_init();
> > > > > >
> > > > > > IODIR0 |= (1 << 31);
> > > > > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > > > > >
> > > > > > //Init UART0 for debug
> > > > > > PINSEL0 |= 0x00000005; //enable uart0
> > > > > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > > > > U0DLM = 0x00;
> > > > > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> > > > >
> > > > > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > > > > 60MHz, you will likely encounter USB problems, as obviously you
> > > > > cannot reach 48MHz with enough accuracy either.
> > > > >
> > > > > > U0LCR = 0x03; // DLAB = 0
> > > > > >
> > > > > > //Init rprintf
> > > > > > rprintf_devopen(putc_serial0);
> > > > > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > > > > >
> > > > > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > > > > }
> > > > > >
> > > > > > /**********************************************************
> > > > > > Initialize
> > > > > > **********************************************************/
> > > > > >
> > > > > > #define PLOCK 0x400
> > > > > >
> > > > > > void system_init(void)
> > > > > > {
> > > > > > // Setting Multiplier and Divider values
> > > > > > PLLCFG=0x24;
> > > > > > feed();
> > > > > >
> > > > > > // Enabling the PLL */
> > > > > > PLLCON=0x1;
> > > > > > feed();
> > > > > >
> > > > > > // Wait for the PLL to lock to set frequency
> > > > > > while(!(PLLSTAT & PLOCK)) ;
> > > > > >
> > > > > > // Connect the PLL as the clock source
> > > > > > PLLCON=0x3;
> > > > > > feed();
> > > > > >
> > > > > > // Enabling MAM and setting number of clocks used for
> > > > > > Flash memory fetch (4 cclks in this case)
> > > > > > //MAMTIM=0x3; //VCOM?
> > > > > > MAMCR=0x2;
> > > > > > MAMTIM=0x4; //Original
> > > > >
> > > > > It may not matter, but I usually change the MAM timing values
> > > > > prior to enabling the PLL. My rational is that if the values
> > > > > are set wrong when already running at 60MHz, how could I expect
> > > > > to reliably set them? Since there is no guarantee that I can read
> > > > > from flash if they are set for a lower clock rate.
> > > > >
> > > > > >
> > > > > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > > > > VPBDIV=0x1;
> > > > > > }
> > > > > >
> > > > > >
> > > > >
> > > > > Like I said before, your initialization looks fine, but I
> suspect the
> > > > > problem you are having might be elsewhere. So it would be useful to
> > > > > see the rest of your serial port code. Perhaps there is some timing
> > > > > issue that occurs when you run 5 times slower.
> > > > >
> > > > > When I developed my UART code, I had all sorts of problems that
> would
> > > > > occur at times, with seemingly no explanation, until I figured out
> > > > > the problem. It was very non-obvious at the time.
> > > > >
> > > > > So, if you can, break this down into a small piece of code that
> > > > > demonstrates the problem, I'll take a look at it.
> > > > >
> > > > > Mike
> > > > >
> > > > >
> > > > >
> > > > > > --- In l...
>
> > > , "Michael Anton" wrote:
> > > > > > >
> > > > > > > Perhaps you could post the balance of your UART code. The
> > > > > > initialization
> > > > > > > looks fine to me.
> > > > > > >
> > > > > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > > > > Just to see if
> > > > > > > it is the changing
> > > > > > > between the clock speeds that has something to do with the
> > > > > > behaviour you are
> > > > > > > seeing.
> > > > > > >
> > > > > > > Mike
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: l...
>
> > > > > > [mailto:l...
>
> > > ]On Behalf Of
> > > > > > > ssonderhoff
> > > > > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > > > > To: l...
>
> > > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > > > > pclk - not working -
> > > > > > > Any Advice would be app.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > I will be appreciative for any insights, this is starting
> > > > > > to get quite
> > > > > > > frustrating.
> > > > > > >
> > > > > > > This is the code used to set the PLL to 60mhz. I modified
> > > > > > it to not set
> > > > > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > > > > going to this
> > > > > > > code all together. all gave the same result. As i mentioned
> > > earlier,
> > > > > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > > > > not worked with or
> > > > > > > without setting PLL. UART settings are in the previous message
> > > > > > >
> > > > > > > Thanks again,
> > > > > > > Stefan
> > > > > > >
> > > > > > > void PLL_init(int speed)
> > > > > > > {
> > > > > > >
> > > > > > > if(speed=t){PLLCFG=0x24;} // Setting
> > > > > > Multiplier(5) and Divider(4)
> > > > > > > so 5xosc (12mhz) = 60 mhz
> > > > > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > > > > >
> > > > > > > feed();
> > > > > > >
> > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > feed();
> > > > > > >
> > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > > > > frequency
> > > > > > >
> > > > > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > > > > feed();
> > > > > > > }
> > > > > > > --- In l...
>
> > > , "ssonderhoff"
> > > > > > wrote:
> > > > > > > >
> > > > > > > > I removed the setting the PLL - after wake up I do not
> set PLL -
> > > > > > > > same problem - UART0 outputs garbage (see sample)
> > > > > > > >
> > > > > > > > 07*6@7*6@0w*4@0w*4.
> > > > > > > >
> > > > > > > > the light on the serial connection is blinking and the
> > > > > > junk is being
> > > > > > > output at a regular interval. these are the settings used
> > > > > > to set the baud
> > > > > > > rate to 9600 - They seem correct to me
> > > > > > > >
> > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > U0DLL = 0x4E; //lsb = 78
> > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > > > > //VICIntEnClr = 0x00000040;
> > > > > > > > U0IER = 0x00;
> > > > > > > >
> > > > > > > > I am at a loss and would appreciate any help
> > > > > > > > Stefan
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > --- In l...
>
> > > , Sutton Mehaffey sutton@ wrote:
> > > > > > > > >
> > > > > > > > > I don't turn PLL on when I use PCLKK. Mine works
> > > > > > fine. Try it and
> > > > > > > > > see if it fixes your problem. I think you only need
> > > > > > PLL on if you need
> > > > > > > > > more speed than PCLK.
> > > > > > > > >
> > > > > > > > > ssonderhoff wrote:
> > > > > > > > > >
> > > > > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > > > > the I have a
> > > > > > > blinking
> > > > > > > > > > light that confirms that this is the case, along
> > > > > > with a decrease in
> > > > > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > > > > thought that you
> > > > > > > > > > had to specify the M and P values as well as select
> > > > > > the external
> > > > > > > > > > oscillator. Could this be screwing things up? How
> > > > > > does one avoid
> > > > > > > using
> > > > > > > > > > the PLL? on waking up from sleep mode, do you bother
> setting
> > > > > > > anything,
> > > > > > > > > > or should you actively disable the PLL by setting
> > > > > > PLLC and PLLE to
> > > > > > > 0?
> > > > > > > > > > I assume that Pclk would then = cclk.
> > > > > > > > > >
> > > > > > > > > > Thanks again for the advice
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --- In l...
>
> > >
> > > > > > ,
> > > > > > > > > > Sutton Mehaffey wrote:
> > > > > > > > > > >
> > > > > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > > > > need to activate
> > > > > > > PLL0,
> > > > > > > > > > > if that's your CCLK speed.
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > Perhaps I should re-state the question. The
> > > > > > PLLCFG and UART)
> > > > > > > settings
> > > > > > > > > > > > seem to be correct - Please let me know if you
> > > > > > can see some
> > > > > > > > > > mistake - Is
> > > > > > > > > > > > there anything else that could affect UART0
> > > > > > after a cclk change.
> > > > > > > The
> > > > > > > > > > > > port is active, but the output is garbage. Any
> > > > > > thoughts would be
> > > > > > > > > > welcome.
> > > > > > > > > > > >
> > > > > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > > > > ,
> > > > > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > > > > of 12 mhz to
> > > > > > > reduce
> > > > > > > > > > > > power usage. This is working, the power
> > > > > > consumption is down and
> > > > > > > a
> > > > > > > > > > light
> > > > > > > > > > > > blinks at the correct rate. for each speed I
> > > > > > reset the Uart0
> > > > > > > > > > parameters
> > > > > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > > > > >
> > > > > > > > > > > > > the PLL_int(code below) sets processor to
> 12mhz(slow).
> > > > > > > > > > > > >
> > > > > > > > > > > > > At 60mhz Everything is working fine fine and
> > > > > > I can read the
> > > > > > > output
> > > > > > > > > > > > debug text without any problem.
> > > > > > > > > > > > >
> > > > > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > > > > have tried setting
> > > > > > > to
> > > > > > > > > > > > different baud rates from low to high with the
> > > > > > same result.
> > > > > > > > > > > > >
> > > > > > > > > > > > > The Uart settings were determined using the
> > > > > > NXP lpc2000
> > > > > > > calculator
> > > > > > > > > > > > >
> > > > > > > > > > > > > I believe that I have faithfully followed the
> > > > > > data sheet. Can
> > > > > > > > > > anyone
> > > > > > > > > > > > tell me what I am missing?
> > > > > > > > > > > > > Thanks,
> > > > > > > > > > > > > Stefan
> > > > > > > > > > > > >
> > > > > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > > > > {
> > > > > > > > > > > > >
> > > > > > > > > > > > > if(speed=t) {PLLCFG=0x24; } // Setting
> > > > > > Multiplier(5) and
> > > > > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > > > > Multiplier(1) and
> > > > > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > > > > >
> > > > > > > > > > > > > feed();
> > > > > > > > > > > > >
> > > > > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > > > > feed();
> > > > > > > > > > > > >
> > > > > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > > > > PLL to lock to set
> > > > > > > > > > frequency
> > > > > > > > > > > > >
> > > > > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > > > > > feed();
> > > > > > > > > > > > >
> > > > > > > > > > > > > }
> > > > > > > > > > > > > //********** ********* ********* *********
> > > > > > ********* *********
> > > > > > > > > > > > ********* ***
> > > > > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > > > > {
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > if(speed=t)
> > > > > > > > > > > > > {
> > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > bit, DLAB = 1
> > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > }
> > > > > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > > > > {
> > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > bit, DLAB = 1
> > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > > > > > mulval(7:4) = 12
> > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > }
> > > > > > > > > > > > >
> > > > > > > > > > > > > }
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > Sutton Mehaffey
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Start a New Thread

Going to sleep should disable PLL since you need to reset the PLL after waking.
Also, disabling the PLL after wake up if it was put to sleep at the higher cclk also did not resolve the Uart0 problem. It seems as though you need to wake up the processor and set to the ?same? frequency that it was prior to going to sleep, maybe this has something to do with how I put it to sleep?. I have not tried setting the PLL to the fast cclk on wakeup and then changing it to the lower
speed. I will try this evening.
Stefan

--- In l..., Sutton Mehaffey wrote:
>
> I don't think that interrupt resets the PLL does it? You might need to
> reset it to OFF manually.
>
>
>
> ssonderhoff wrote:
> >
> >
> > I am using EINT3 (non vectored).
> >
> > Once cclk was changed to 12 mhz before going to sleep, the uart0 worked
> > fine before and after sleep. I have changed the baud rate up to 115200
> > and it still is working fine.
> >
> > --- In l... ,
> > Sutton Mehaffey wrote:
> > >
> > > How are you waking the system back up? Pressing reset?
> > >
> > >
> > >
> > > ssonderhoff wrote:
> > > >
> > > >
> > > > Though I am not sure why. It turns out that if you shut off the PLL
> > and
> > > > change UART) settings before you put the system to sleep, then the
> > > > output is the desired text. If you go to sleep and then run the
> > > > identical code the output is the garbled nonsense I was getting. Any
> > > > Ideas why this might be the case?
> > > > Thanks All,
> > > > Stefan
> > > >
> > > > --- In l...
> > ,
> > > > "ssonderhoff" wrote:
> > > > >
> > > > >
> > > > > The board comes with the bootloader loaded and I have loaded all my
> > > > firmware using the bootlader. I would hate to overwrite the bootloader
> > > > and not be able to program the board. my test program puts the
> > computer
> > > > to sleep and then on wake up resets PLL or not, sets uart and then
> > goes
> > > > into a loop and contsantly prints out a string. At 60mhz everythng
> > works
> > > > and 12, not so much.
> > > > > Stefan
> > > > >
> > > > >
> > > > > --- In l...
> > ,
> > > > "Michael Anton" wrote:
> > > > > >
> > > > > >
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: l...
> >
> > > > > > > [mailto:l...
> >
> > > > ]On Behalf
> > > > > > > Of ssonderhoff
> > > > > > > Sent: Monday, February 08, 2010 10:54 PM
> > > > > > > To: l...
> >
> > > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > > > > > not working
> > > > > > > - Any Advice would be app.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Hi,
> > > > > > > The system boots up using a boot loader that allows the unit
> > > > > > > to act as a thumb drive and access an SD card as well as load
> > > > > > > firmware updates from the sd card. This code initializes the
> > > > > > > system and sets the initial PLL and is difficult and
> > > > > > > dangerous for me to change. the code used to set PLL in the
> > > > > > > bootloader's Boot_up and system_init routines are shown below
> > > > > > > shown below:
> > > > > > >
> > > > > >
> > > > > > Couldn't you write a piece of standalone test code, without
> > > > > > the bootloader, to test your routines when running at 12MHz?
> > > > > >
> > > > > > >
> > > > > > > void boot_up(void)
> > > > > > > {
> > > > > > > //Initialize the MCU clock PLL
> > > > > > > system_init();
> > > > > > >
> > > > > > > IODIR0 |= (1 << 31);
> > > > > > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > > > > > >
> > > > > > > //Init UART0 for debug
> > > > > > > PINSEL0 |= 0x00000005; //enable uart0
> > > > > > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > > > > > U0DLM = 0x00;
> > > > > > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> > > > > >
> > > > > > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > > > > > 60MHz, you will likely encounter USB problems, as obviously you
> > > > > > cannot reach 48MHz with enough accuracy either.
> > > > > >
> > > > > > > U0LCR = 0x03; // DLAB = 0
> > > > > > >
> > > > > > > //Init rprintf
> > > > > > > rprintf_devopen(putc_serial0);
> > > > > > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > > > > > >
> > > > > > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > > > > > }
> > > > > > >
> > > > > > > /**********************************************************
> > > > > > > Initialize
> > > > > > > **********************************************************/
> > > > > > >
> > > > > > > #define PLOCK 0x400
> > > > > > >
> > > > > > > void system_init(void)
> > > > > > > {
> > > > > > > // Setting Multiplier and Divider values
> > > > > > > PLLCFG=0x24;
> > > > > > > feed();
> > > > > > >
> > > > > > > // Enabling the PLL */
> > > > > > > PLLCON=0x1;
> > > > > > > feed();
> > > > > > >
> > > > > > > // Wait for the PLL to lock to set frequency
> > > > > > > while(!(PLLSTAT & PLOCK)) ;
> > > > > > >
> > > > > > > // Connect the PLL as the clock source
> > > > > > > PLLCON=0x3;
> > > > > > > feed();
> > > > > > >
> > > > > > > // Enabling MAM and setting number of clocks used for
> > > > > > > Flash memory fetch (4 cclks in this case)
> > > > > > > //MAMTIM=0x3; //VCOM?
> > > > > > > MAMCR=0x2;
> > > > > > > MAMTIM=0x4; //Original
> > > > > >
> > > > > > It may not matter, but I usually change the MAM timing values
> > > > > > prior to enabling the PLL. My rational is that if the values
> > > > > > are set wrong when already running at 60MHz, how could I expect
> > > > > > to reliably set them? Since there is no guarantee that I can read
> > > > > > from flash if they are set for a lower clock rate.
> > > > > >
> > > > > > >
> > > > > > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > > > > > VPBDIV=0x1;
> > > > > > > }
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > Like I said before, your initialization looks fine, but I
> > suspect the
> > > > > > problem you are having might be elsewhere. So it would be useful to
> > > > > > see the rest of your serial port code. Perhaps there is some timing
> > > > > > issue that occurs when you run 5 times slower.
> > > > > >
> > > > > > When I developed my UART code, I had all sorts of problems that
> > would
> > > > > > occur at times, with seemingly no explanation, until I figured out
> > > > > > the problem. It was very non-obvious at the time.
> > > > > >
> > > > > > So, if you can, break this down into a small piece of code that
> > > > > > demonstrates the problem, I'll take a look at it.
> > > > > >
> > > > > > Mike
> > > > > >
> > > > > >
> > > > > >
> > > > > > > --- In l...
> >
> > > > , "Michael Anton" wrote:
> > > > > > > >
> > > > > > > > Perhaps you could post the balance of your UART code. The
> > > > > > > initialization
> > > > > > > > looks fine to me.
> > > > > > > >
> > > > > > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > > > > > Just to see if
> > > > > > > > it is the changing
> > > > > > > > between the clock speeds that has something to do with the
> > > > > > > behaviour you are
> > > > > > > > seeing.
> > > > > > > >
> > > > > > > > Mike
> > > > > > > >
> > > > > > > > -----Original Message-----
> > > > > > > > From: l...
> >
> > > > > > > [mailto:l...
> >
> > > > ]On Behalf Of
> > > > > > > > ssonderhoff
> > > > > > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > > > > > To: l...
> >
> > > > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > > > > > pclk - not working -
> > > > > > > > Any Advice would be app.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > I will be appreciative for any insights, this is starting
> > > > > > > to get quite
> > > > > > > > frustrating.
> > > > > > > >
> > > > > > > > This is the code used to set the PLL to 60mhz. I modified
> > > > > > > it to not set
> > > > > > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > > > > > going to this
> > > > > > > > code all together. all gave the same result. As i mentioned
> > > > earlier,
> > > > > > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > > > > > not worked with or
> > > > > > > > without setting PLL. UART settings are in the previous message
> > > > > > > >
> > > > > > > > Thanks again,
> > > > > > > > Stefan
> > > > > > > >
> > > > > > > > void PLL_init(int speed)
> > > > > > > > {
> > > > > > > >
> > > > > > > > if(speed==fast){PLLCFG=0x24;} // Setting
> > > > > > > Multiplier(5) and Divider(4)
> > > > > > > > so 5xosc (12mhz) = 60 mhz
> > > > > > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > > > > > >
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock to set
> > > > > > > > frequency
> > > > > > > >
> > > > > > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > > > > > feed();
> > > > > > > > }
> > > > > > > > --- In l...
> >
> > > > , "ssonderhoff"
> > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > I removed the setting the PLL - after wake up I do not
> > set PLL -
> > > > > > > > > same problem - UART0 outputs garbage (see sample)
> > > > > > > > >
> > > > > > > > > 07*6@7*6@0w*4@0w*4.
> > > > > > > > >
> > > > > > > > > the light on the serial connection is blinking and the
> > > > > > > junk is being
> > > > > > > > output at a regular interval. these are the settings used
> > > > > > > to set the baud
> > > > > > > > rate to 9600 - They seem correct to me
> > > > > > > > >
> > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > U0DLL = 0x4E; //lsb = 78
> > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > > > > > //VICIntEnClr = 0x00000040;
> > > > > > > > > U0IER = 0x00;
> > > > > > > > >
> > > > > > > > > I am at a loss and would appreciate any help
> > > > > > > > > Stefan
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > --- In l...
> >
> > > > , Sutton Mehaffey sutton@ wrote:
> > > > > > > > > >
> > > > > > > > > > I don't turn PLL on when I use PCLK=CCLK. Mine works
> > > > > > > fine. Try it and
> > > > > > > > > > see if it fixes your problem. I think you only need
> > > > > > > PLL on if you need
> > > > > > > > > > more speed than PCLK.
> > > > > > > > > >
> > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > >
> > > > > > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > > > > > the I have a
> > > > > > > > blinking
> > > > > > > > > > > light that confirms that this is the case, along
> > > > > > > with a decrease in
> > > > > > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > > > > > thought that you
> > > > > > > > > > > had to specify the M and P values as well as select
> > > > > > > the external
> > > > > > > > > > > oscillator. Could this be screwing things up? How
> > > > > > > does one avoid
> > > > > > > > using
> > > > > > > > > > > the PLL? on waking up from sleep mode, do you bother
> > setting
> > > > > > > > anything,
> > > > > > > > > > > or should you actively disable the PLL by setting
> > > > > > > PLLC and PLLE to
> > > > > > > > 0?
> > > > > > > > > > > I assume that Pclk would then = cclk.
> > > > > > > > > > >
> > > > > > > > > > > Thanks again for the advice
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > --- In l...
> >
> > > >
> > > > > > > ,
> > > > > > > > > > > Sutton Mehaffey wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > > > > > need to activate
> > > > > > > > PLL0,
> > > > > > > > > > > > if that's your CCLK speed.
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > Perhaps I should re-state the question. The
> > > > > > > PLLCFG and UART)
> > > > > > > > settings
> > > > > > > > > > > > > seem to be correct - Please let me know if you
> > > > > > > can see some
> > > > > > > > > > > mistake - Is
> > > > > > > > > > > > > there anything else that could affect UART0
> > > > > > > after a cclk change.
> > > > > > > > The
> > > > > > > > > > > > > port is active, but the output is garbage. Any
> > > > > > > thoughts would be
> > > > > > > > > > > welcome.
> > > > > > > > > > > > >
> > > > > > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > > > > > ,
> > > > > > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > > > > > of 12 mhz to
> > > > > > > > reduce
> > > > > > > > > > > > > power usage. This is working, the power
> > > > > > > consumption is down and
> > > > > > > > a
> > > > > > > > > > > light
> > > > > > > > > > > > > blinks at the correct rate. for each speed I
> > > > > > > reset the Uart0
> > > > > > > > > > > parameters
> > > > > > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > the PLL_int(code below) sets processor to
> > 12mhz(slow).
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > At 60mhz Everything is working fine fine and
> > > > > > > I can read the
> > > > > > > > output
> > > > > > > > > > > > > debug text without any problem.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > > > > > have tried setting
> > > > > > > > to
> > > > > > > > > > > > > different baud rates from low to high with the
> > > > > > > same result.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > The Uart settings were determined using the
> > > > > > > NXP lpc2000
> > > > > > > > calculator
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I believe that I have faithfully followed the
> > > > > > > data sheet. Can
> > > > > > > > > > > anyone
> > > > > > > > > > > > > tell me what I am missing?
> > > > > > > > > > > > > > Thanks,
> > > > > > > > > > > > > > Stefan
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > > > > > {
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > if(speed==fast) {PLLCFG=0x24; } // Setting
> > > > > > > Multiplier(5) and
> > > > > > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > > > > > Multiplier(1) and
> > > > > > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > > > > > PLL to lock to set
> > > > > > > > > > > frequency
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock source
> > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > }
> > > > > > > > > > > > > > //********** ********* ********* *********
> > > > > > > ********* *********
> > > > > > > > > > > > > ********* ***
> > > > > > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > > > > > {
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > if(speed==fast)
> > > > > > > > > > > > > > {
> > > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > > bit, DLAB = 1
> > > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > > }
> > > > > > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > > > > > {
> > > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > > bit, DLAB = 1
> > > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3: 0) = 1 &
> > > > > > > > mulval(7:4) = 12
> > > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > > }
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > }
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > Sutton Mehaffey
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Start a New Thread

I just tried it. I had PCLK = CCLK = 12mhz (PLL off). I set it to
18mhz before sleep mode (PLL0CON = 1, and PLL0CFG set to some value).
It was still 18mhz after EINT3 wake up, with the same PLL0 values. So,
waking up after going to sleep mode does not reset PLL values. An
actual reset (software or hardware) probably does.

ssonderhoff wrote:
>
>
> Going to sleep should disable PLL since you need to reset the PLL after
> waking.
> Also, disabling the PLL after wake up if it was put to sleep at the
> higher cclk also did not resolve the Uart0 problem. It seems as though
> you need to wake up the processor and set to the ?same? frequency that
> it was prior to going to sleep, maybe this has something to do with how
> I put it to sleep?. I have not tried setting the PLL to the fast cclk on
> wakeup and then changing it to the lower
> speed. I will try this evening.
> Stefan
>
> --- In l... ,
> Sutton Mehaffey wrote:
> >
> > I don't think that interrupt resets the PLL does it? You might need to
> > reset it to OFF manually.
> >
> >
> >
> > ssonderhoff wrote:
> > >
> > >
> > > I am using EINT3 (non vectored).
> > >
> > > Once cclk was changed to 12 mhz before going to sleep, the uart0
> worked
> > > fine before and after sleep. I have changed the baud rate up to 115200
> > > and it still is working fine.
> > >
> > > --- In l...
> ,
> > > Sutton Mehaffey wrote:
> > > >
> > > > How are you waking the system back up? Pressing reset?
> > > >
> > > >
> > > >
> > > > ssonderhoff wrote:
> > > > >
> > > > >
> > > > > Though I am not sure why. It turns out that if you shut off the
> PLL
> > > and
> > > > > change UART) settings before you put the system to sleep, then the
> > > > > output is the desired text. If you go to sleep and then run the
> > > > > identical code the output is the garbled nonsense I was
> getting. Any
> > > > > Ideas why this might be the case?
> > > > > Thanks All,
> > > > > Stefan
> > > > >
> > > > > --- In l...
>
> > > ,
> > > > > "ssonderhoff" wrote:
> > > > > >
> > > > > >
> > > > > > The board comes with the bootloader loaded and I have loaded
> all my
> > > > > firmware using the bootlader. I would hate to overwrite the
> bootloader
> > > > > and not be able to program the board. my test program puts the
> > > computer
> > > > > to sleep and then on wake up resets PLL or not, sets uart and then
> > > goes
> > > > > into a loop and contsantly prints out a string. At 60mhz everythng
> > > works
> > > > > and 12, not so much.
> > > > > > Stefan
> > > > > >
> > > > > >
> > > > > > --- In l...
>
> > > ,
> > > > > "Michael Anton" wrote:
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > -----Original Message-----
> > > > > > > > From: l...
>
> > >
> > > > > > > > [mailto:l...
>
> > >
> > > > > ]On Behalf
> > > > > > > > Of ssonderhoff
> > > > > > > > Sent: Monday, February 08, 2010 10:54 PM
> > > > > > > > To: l...
>
> > >
> > > > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz pclk -
> > > > > > > > not working
> > > > > > > > - Any Advice would be app.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Hi,
> > > > > > > > The system boots up using a boot loader that allows the unit
> > > > > > > > to act as a thumb drive and access an SD card as well as load
> > > > > > > > firmware updates from the sd card. This code initializes the
> > > > > > > > system and sets the initial PLL and is difficult and
> > > > > > > > dangerous for me to change. the code used to set PLL in the
> > > > > > > > bootloader's Boot_up and system_init routines are shown below
> > > > > > > > shown below:
> > > > > > > >
> > > > > > >
> > > > > > > Couldn't you write a piece of standalone test code, without
> > > > > > > the bootloader, to test your routines when running at 12MHz?
> > > > > > >
> > > > > > > >
> > > > > > > > void boot_up(void)
> > > > > > > > {
> > > > > > > > //Initialize the MCU clock PLL
> > > > > > > > system_init();
> > > > > > > >
> > > > > > > > IODIR0 |= (1 << 31);
> > > > > > > > IOCLR0 |= (1 << 31); //Turn on USB LED
> > > > > > > >
> > > > > > > > //Init UART0 for debug
> > > > > > > > PINSEL0 |= 0x00000005; //enable uart0
> > > > > > > > U0LCR = 0x83; // 8 bits, no Parity, 1 Stop bit, DLAB = 1
> > > > > > > > U0DLM = 0x00;
> > > > > > > > U0DLL = 0x20; // 115200 Baud Rate @ 58982400 VPB Clock
> > > > > > >
> > > > > > > So are you using a 58982400Hz clock, or 60MHz? If this is not
> > > > > > > 60MHz, you will likely encounter USB problems, as obviously you
> > > > > > > cannot reach 48MHz with enough accuracy either.
> > > > > > >
> > > > > > > > U0LCR = 0x03; // DLAB = 0
> > > > > > > >
> > > > > > > > //Init rprintf
> > > > > > > > rprintf_devopen(putc_serial0);
> > > > > > > > rprintf("\n\n\nUSB Bootloader v1.1\n");
> > > > > > > >
> > > > > > > > //IOSET0 |= (1 << 31); //Turn off USB LED
> > > > > > > > }
> > > > > > > >
> > > > > > > > /**********************************************************
> > > > > > > > Initialize
> > > > > > > > **********************************************************/
> > > > > > > >
> > > > > > > > #define PLOCK 0x400
> > > > > > > >
> > > > > > > > void system_init(void)
> > > > > > > > {
> > > > > > > > // Setting Multiplier and Divider values
> > > > > > > > PLLCFG=0x24;
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > // Enabling the PLL */
> > > > > > > > PLLCON=0x1;
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > // Wait for the PLL to lock to set frequency
> > > > > > > > while(!(PLLSTAT & PLOCK)) ;
> > > > > > > >
> > > > > > > > // Connect the PLL as the clock source
> > > > > > > > PLLCON=0x3;
> > > > > > > > feed();
> > > > > > > >
> > > > > > > > // Enabling MAM and setting number of clocks used for
> > > > > > > > Flash memory fetch (4 cclks in this case)
> > > > > > > > //MAMTIM=0x3; //VCOM?
> > > > > > > > MAMCR=0x2;
> > > > > > > > MAMTIM=0x4; //Original
> > > > > > >
> > > > > > > It may not matter, but I usually change the MAM timing values
> > > > > > > prior to enabling the PLL. My rational is that if the values
> > > > > > > are set wrong when already running at 60MHz, how could I expect
> > > > > > > to reliably set them? Since there is no guarantee that I
> can read
> > > > > > > from flash if they are set for a lower clock rate.
> > > > > > >
> > > > > > > >
> > > > > > > > // Setting peripheral Clock (pclk) to System Clock (cclk)
> > > > > > > > VPBDIV=0x1;
> > > > > > > > }
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > Like I said before, your initialization looks fine, but I
> > > suspect the
> > > > > > > problem you are having might be elsewhere. So it would be
> useful to
> > > > > > > see the rest of your serial port code. Perhaps there is
> some timing
> > > > > > > issue that occurs when you run 5 times slower.
> > > > > > >
> > > > > > > When I developed my UART code, I had all sorts of problems
> that
> > > would
> > > > > > > occur at times, with seemingly no explanation, until I
> figured out
> > > > > > > the problem. It was very non-obvious at the time.
> > > > > > >
> > > > > > > So, if you can, break this down into a small piece of code that
> > > > > > > demonstrates the problem, I'll take a look at it.
> > > > > > >
> > > > > > > Mike
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > --- In l...
>
> > >
> > > > > , "Michael Anton"
> wrote:
> > > > > > > > >
> > > > > > > > > Perhaps you could post the balance of your UART code. The
> > > > > > > > initialization
> > > > > > > > > looks fine to me.
> > > > > > > > >
> > > > > > > > > Have you tried using only 12MHz, and not going into 60MHz?
> > > > > > > > Just to see if
> > > > > > > > > it is the changing
> > > > > > > > > between the clock speeds that has something to do with the
> > > > > > > > behaviour you are
> > > > > > > > > seeing.
> > > > > > > > >
> > > > > > > > > Mike
> > > > > > > > >
> > > > > > > > > -----Original Message-----
> > > > > > > > > From: l...
>
> > >
> > > > > > > > [mailto:l...
>
> > >
> > > > > ]On Behalf Of
> > > > > > > > > ssonderhoff
> > > > > > > > > Sent: Monday, February 08, 2010 8:46 PM
> > > > > > > > > To: l...
>
> > >
> > > > > > > > > Subject: [lpc2000] Re: LPC2148 setting Uart0 at 12mhz
> > > > > > > > pclk - not working -
> > > > > > > > > Any Advice would be app.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > I will be appreciative for any insights, this is starting
> > > > > > > > to get quite
> > > > > > > > > frustrating.
> > > > > > > > >
> > > > > > > > > This is the code used to set the PLL to 60mhz. I modified
> > > > > > > > it to not set
> > > > > > > > > the PLL in slow mode (12mhz) on wake up and then eliminated
> > > > > > > > going to this
> > > > > > > > > code all together. all gave the same result. As i mentioned
> > > > > earlier,
> > > > > > > > > everything works fine at 60mhz, where as at 12 mhz it has
> > > > > > > > not worked with or
> > > > > > > > > without setting PLL. UART settings are in the previous
> message
> > > > > > > > >
> > > > > > > > > Thanks again,
> > > > > > > > > Stefan
> > > > > > > > >
> > > > > > > > > void PLL_init(int speed)
> > > > > > > > > {
> > > > > > > > >
> > > > > > > > > if(speed=t){PLLCFG=0x24;} // Setting
> > > > > > > > Multiplier(5) and Divider(4)
> > > > > > > > > so 5xosc (12mhz) = 60 mhz
> > > > > > > > > else{VPBDIV = 0x1; return;} //pclk = cclk PLLCFG=0x60
> > > > > > > > >
> > > > > > > > > feed();
> > > > > > > > >
> > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > feed();
> > > > > > > > >
> > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the PLL to lock
> to set
> > > > > > > > > frequency
> > > > > > > > >
> > > > > > > > > PLLCON=0x3;// Connect the PLL as the clock source
> > > > > > > > > feed();
> > > > > > > > > }
> > > > > > > > > --- In l...
>
> > >
> > > > > , "ssonderhoff"
> > > > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > I removed the setting the PLL - after wake up I do not
> > > set PLL -
> > > > > > > > > > same problem - UART0 outputs garbage (see sample)
> > > > > > > > > >
> > > > > > > > > > 07*6@7*6@0w*4@0w*4.
> > > > > > > > > >
> > > > > > > > > > the light on the serial connection is blinking and the
> > > > > > > > junk is being
> > > > > > > > > output at a regular interval. these are the settings used
> > > > > > > > to set the baud
> > > > > > > > > rate to 9600 - They seem correct to me
> > > > > > > > > >
> > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop bit, DLAB = 1
> > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > U0DLL = 0x4E; //lsb = 78
> > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > U0LCR &= ~(0x80); // turn off DLAB //U0LCR = x03;
> > > > > > > > > > //VICIntEnClr = 0x00000040;
> > > > > > > > > > U0IER = 0x00;
> > > > > > > > > >
> > > > > > > > > > I am at a loss and would appreciate any help
> > > > > > > > > > Stefan
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --- In l...
>
> > >
> > > > > , Sutton Mehaffey sutton@ wrote:
> > > > > > > > > > >
> > > > > > > > > > > I don't turn PLL on when I use PCLKK. Mine works
> > > > > > > > fine. Try it and
> > > > > > > > > > > see if it fixes your problem. I think you only need
> > > > > > > > PLL on if you need
> > > > > > > > > > > more speed than PCLK.
> > > > > > > > > > >
> > > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > Thanks for the reply. I am running at 12mhz, and
> > > > > > > > the I have a
> > > > > > > > > blinking
> > > > > > > > > > > > light that confirms that this is the case, along
> > > > > > > > with a decrease in
> > > > > > > > > > > > power draw. I am setting the multiplier(M) to 1. I
> > > > > > > > thought that you
> > > > > > > > > > > > had to specify the M and P values as well as select
> > > > > > > > the external
> > > > > > > > > > > > oscillator. Could this be screwing things up? How
> > > > > > > > does one avoid
> > > > > > > > > using
> > > > > > > > > > > > the PLL? on waking up from sleep mode, do you bother
> > > setting
> > > > > > > > > anything,
> > > > > > > > > > > > or should you actively disable the PLL by setting
> > > > > > > > PLLC and PLLE to
> > > > > > > > > 0?
> > > > > > > > > > > > I assume that Pclk would then = cclk.
> > > > > > > > > > > >
> > > > > > > > > > > > Thanks again for the advice
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --- In l...
>
> > >
> > > > >
> > > > > > > > ,
> > > > > > > > > > > > Sutton Mehaffey wrote:
> > > > > > > > > > > > >
> > > > > > > > > > > > > What's your Fosc? If it is 12, I don't think you
> > > > > > > > need to activate
> > > > > > > > > PLL0,
> > > > > > > > > > > > > if that's your CCLK speed.
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > ssonderhoff wrote:
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Perhaps I should re-state the question. The
> > > > > > > > PLLCFG and UART)
> > > > > > > > > settings
> > > > > > > > > > > > > > seem to be correct - Please let me know if you
> > > > > > > > can see some
> > > > > > > > > > > > mistake - Is
> > > > > > > > > > > > > > there anything else that could affect UART0
> > > > > > > > after a cclk change.
> > > > > > > > > The
> > > > > > > > > > > > > > port is active, but the output is garbage. Any
> > > > > > > > thoughts would be
> > > > > > > > > > > > welcome.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > --- In lpc2000@yahoogroups .com
> > > > > > > > > ,
> > > > > > > > > > > > > > "ssonderhoff" wrote:
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I am running the lpc2148 at a low clock speed
> > > > > > > > of 12 mhz to
> > > > > > > > > reduce
> > > > > > > > > > > > > > power usage. This is working, the power
> > > > > > > > consumption is down and
> > > > > > > > > a
> > > > > > > > > > > > light
> > > > > > > > > > > > > > blinks at the correct rate. for each speed I
> > > > > > > > reset the Uart0
> > > > > > > > > > > > parameters
> > > > > > > > > > > > > > to take the pclk into account (code below)
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > the PLL_int(code below) sets processor to
> > > 12mhz(slow).
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > At 60mhz Everything is working fine fine and
> > > > > > > > I can read the
> > > > > > > > > output
> > > > > > > > > > > > > > debug text without any problem.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > At 12 mhz it outputs nothing but garbage, I
> > > > > > > > have tried setting
> > > > > > > > > to
> > > > > > > > > > > > > > different baud rates from low to high with the
> > > > > > > > same result.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > The Uart settings were determined using the
> > > > > > > > NXP lpc2000
> > > > > > > > > calculator
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I believe that I have faithfully followed the
> > > > > > > > data sheet. Can
> > > > > > > > > > > > anyone
> > > > > > > > > > > > > > tell me what I am missing?
> > > > > > > > > > > > > > > Thanks,
> > > > > > > > > > > > > > > Stefan
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > //*********CODE* ********* *
> > > > > > > > > > > > > > > void PLL_init(int speed) // sets clock speed
> > > > > > > > > > > > > > > {
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > if(speed=t) {PLLCFG=0x24; } // Setting
> > > > > > > > Multiplier(5) and
> > > > > > > > > > > > > > Divider(4) so 5xosc (12mhz) = 60 mhz
> > > > > > > > > > > > > > > else{PLLCFG= 0x60;VPBDIV = 0x1;} //Setting
> > > > > > > > Multiplier(1) and
> > > > > > > > > > > > > > Divider(8) 1xosc = 12mhz: pclk = cclk
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > PLLCON=0x1; // Enabling the PLL
> > > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > while(!(PLLSTAT & PLOCK)) ;// Wait for the
> > > > > > > > PLL to lock to set
> > > > > > > > > > > > frequency
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > PLLCON=0x3;/ / Connect the PLL as the clock
> source
> > > > > > > > > > > > > > > feed();
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > }
> > > > > > > > > > > > > > > //********** ********* ********* *********
> > > > > > > > ********* *********
> > > > > > > > > > > > > > ********* ***
> > > > > > > > > > > > > > > void setuart(int speed) //sets up UART0
> > > > > > > > > > > > > > > {
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > if(speed=t)
> > > > > > > > > > > > > > > {
> > > > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > > > bit, DLAB = 1
> > > > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > > > U0DLL = 0x20; //lsb = 32
> > > > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > > > U0LCR = 0x03; // 8 bit character length
> > > > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > > > }
> > > > > > > > > > > > > > > else //initialize uart0 115200 buad 12mhz
> > > > > > > > > > > > > > > {
> > > > > > > > > > > > > > > U0LCR = 0x83; // 8 bits, no parity, 1 stop
> > > > > > > > bit, DLAB = 1
> > > > > > > > > > > > > > > U0DLM = 0x00; //msb = 0
> > > > > > > > > > > > > > > U0DLL = 0x6; //lsb = 6
> > > > > > > > > > > > > > > U0FDR = 0xC1; //fract divider divaddval(3:
> 0) = 1 &
> > > > > > > > > mulval(7:4) = 12
> > > > > > > > > > > > > > > U0FCR = 0x07; // enable and reset
> > > > > > > > > > > > > > > U0LCR = 0x03;
> > > > > > > > > > > > > > > VICIntEnClr = 0x00000040;
> > > > > > > > > > > > > > > U0IER = 0x00;
> > > > > > > > > > > > > > > }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > }
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > --
> > > > > > > > > > > > > Sutton Mehaffey
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Start a New Thread