Reply by Herbert Demmel●February 25, 20062006-02-25
Sten,
thank you for your valuable input. I've now changed the source code
according to your comments and turned on power for PWM0 (although it should
be on, the code below is the only code currently running) but it does not
work yet.
I'm using a LPC2136 with Keil C V.2.42
Any further ideas why the stuff does not work???
Regards
Herbert
-------------
#include <LPC213x.H> /* LPC213x definitions */
#define TICKS_PER_US 15
void io_alarm_out(unsigned int freq)
{
PWMTCR = (0x01 << 0) | (0x01 << 1); // Enter reset
state and
force counter to zero
// match register 0 controls the cycle frequency
PWMMR0 = 1000000 * TICKS_PER_US / freq;
// we want to have a duty cycle of 50% so always set PWMMR5 to
half of PWMMR0
PWMMR5 = PWMMR0 / 2;
// enable PWM5 output
PWMPCR |= (0x01 << 13);
PWMTCR = (0x01 << 0) | (0x01 << 3); // Re-enable PWM
}
int main(void)
{
// Turn on power control for PWM0
PCONP |= (0x01 << 5);
// --- PWM5 setup ---
// Enable P0.21 to be PWM5
PINSEL1 |= (0x01 << 10);
// PWMTCR = 1; // enable PWM timer, let shadow register
disabled
// reset PWM timer when PWMMR0 matches
PWMMCR = 0x2;
// gives 1000Hz
io_alarm_out(1000);
while (1)
;
}
-------------
At 09:27 25.02.2006 +0100, you wrote:
>Sten wrote:
> > Herbert Demmel wrote:
> >
> >>Hi,
> >>
> >>I seem to miss something with setting up PWM5 output - the routine
below
> >>sometimes works, sometimes not (depending non additional code -
this
> >>versions below currentlly does NOT work).
> >>
> >>Any idea what I miss to setup?
> >>
> >>Thanks for your input.
> >>
> >>Regards
> >>Herbert
> >>
> >>#include <LPC213x.H> /* LPC213x
definitions */
> >>
> >>#define TICKS_PER_US 15
> >>
> >>void io_alarm_out(unsigned int freq)
> >>{
> >
> >
> > PWMTCR = (1ul << 0) | (1ul << 1); /* Enter
reset state and
> force counter to zero*/
> >
> >
> >> // match register 0 controls the cycle frequency
> >> PWMMR0 = 1000000 * TICKS_PER_US / freq;
> >>
> >> // we want to have a duty cycle of 50% so always set
PWMMR5 to
> >>half of PWMMR0
> >> PWMMR5 = PWMMR0 / 2;
> >>
> >> // enable PWM5 output
> >> PWMPCR |= (0x01 << 13);
> >
> >
> > PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable
PWM */
> >
> >
> >>}
> >>
> >>int main(void)
> >>{
> >> // --- PWM5 setup ---
> >>
> >> // Enable P0.21 to be PWM5
> >> PINSEL1 |= (0x01 << 10);
> >> PWMTCR = 1; // enable PWM timer, let shadow
register
> >>disabled
> >>
> >> // reset PWM timer when PWMMR0 matches
> >
> > // PWMMCR = 0x2;
> >
> >> // gives 1000Hz
> >> io_alarm_out(1000);
> >>
> >> while (1)
> >> ;
> >>}
> >>
> >
> >
> > Hallo Herbert,
> >
> > Mmmmh, don't you need to turn on PWM module in PCONP? Or do you
let all
> peripherials active on
> > startup by default?
> >
> > But bit #3 in PWMTCR enables PWM module. Description of this bit says:
> > "When one, PWM mode is enabled. PWM mode causes shadow
registers..."
> (2294's datasheet, p.233)
> >
> > After you have enabled PWM module (if bit #3 in PWMTCR is set) and set
> up a value in a PWMMRx
> > register you just need to set the appropriated bit in PWMLER register
> to take effect of new PWMMRx
> > value.
> >
> > You do not need using PWMLER register if you hold PWM in reset state
> during changing PWMMRx values
> > (see changes above).
> >
> > Try it!
> > Sten
> >
>
>Oooops, sorry! Do not comment PWMMCR in main(). But you can uncomment
>PWMTCR statement instead.
>
> Sten
>
>--
>/************************************************
>Do you need a tiny and efficient real time
>operating system (RTOS) with a preemtive
>multitasking for LPC2000 or AT91SAM7?
>
> <http://nanortos.net-attack.de/" target="_blank" rel="nofollow">http://nanortos.net-attack.de/>http://nanortos.net-attack.de/
>
>Or some open-source tools and code for LPC2000?
>
> <http://www.net-attack.de/" target="_blank" rel="nofollow">http://www.net-attack.de/>http://www.net-attack.de/
>
>************************************************/
>
>
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Radnitzkygasse 43
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Reply by Sten●February 25, 20062006-02-25
Sten wrote:
> Herbert Demmel wrote:
>
>>Hi,
>>
>>I seem to miss something with setting up PWM5 output - the routine below
>>sometimes works, sometimes not (depending non additional code - this
>>versions below currentlly does NOT work).
>>
>>Any idea what I miss to setup?
>>
>>Thanks for your input.
>>
>>Regards
>>Herbert
>>
>>#include <LPC213x.H> /* LPC213x definitions */
>>
>>#define TICKS_PER_US 15
>>
>>void io_alarm_out(unsigned int freq)
>>{
>
>
> PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and
force counter to zero*/
>
>
>> // match register 0 controls the cycle frequency
>> PWMMR0 = 1000000 * TICKS_PER_US / freq;
>>
>> // we want to have a duty cycle of 50% so always set PWMMR5 to
>>half of PWMMR0
>> PWMMR5 = PWMMR0 / 2;
>>
>> // enable PWM5 output
>> PWMPCR |= (0x01 << 13);
>
>
> PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
>
>
>>}
>>
>>int main(void)
>>{
>> // --- PWM5 setup ---
>>
>> // Enable P0.21 to be PWM5
>> PINSEL1 |= (0x01 << 10);
>> PWMTCR = 1; // enable PWM timer, let shadow
register
>>disabled
>>
>> // reset PWM timer when PWMMR0 matches
>
> // PWMMCR = 0x2;
>
>> // gives 1000Hz
>> io_alarm_out(1000);
>>
>> while (1)
>> ;
>>}
>>
>
>
> Hallo Herbert,
>
> Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let
all peripherials active on
> startup by default?
>
> But bit #3 in PWMTCR enables PWM module. Description of this bit says:
> "When one, PWM mode is enabled. PWM mode causes shadow
registers..." (2294's datasheet, p.233)
>
> After you have enabled PWM module (if bit #3 in PWMTCR is set) and set up a
value in a PWMMRx
> register you just need to set the appropriated bit in PWMLER register to
take effect of new PWMMRx
> value.
>
> You do not need using PWMLER register if you hold PWM in reset state during
changing PWMMRx values
> (see changes above).
>
> Try it!
> Sten
>
Oooops, sorry! Do not comment PWMMCR in main(). But you can uncomment PWMTCR
statement instead.
Sten
--
/************************************************
Do you need a tiny and efficient real time
operating system (RTOS) with a preemtive
multitasking for LPC2000 or AT91SAM7?
http://nanortos.net-attack.de/
Or some open-source tools and code for LPC2000?
http://www.net-attack.de/
************************************************/
Reply by Sten●February 25, 20062006-02-25
Herbert Demmel wrote:
> Hi,
>
> I seem to miss something with setting up PWM5 output - the routine below
> sometimes works, sometimes not (depending non additional code - this
> versions below currentlly does NOT work).
>
> Any idea what I miss to setup?
>
> Thanks for your input.
>
> Regards
> Herbert
>
> #include <LPC213x.H> /* LPC213x definitions */
>
> #define TICKS_PER_US 15
>
> void io_alarm_out(unsigned int freq)
> {
PWMTCR = (1ul << 0) | (1ul << 1); /* Enter reset state and force
counter to zero*/
> // match register 0 controls the cycle
frequency
> PWMMR0 = 1000000 * TICKS_PER_US / freq;
>
> // we want to have a duty cycle of 50% so always set PWMMR5 to
> half of PWMMR0
> PWMMR5 = PWMMR0 / 2;
>
> // enable PWM5 output
> PWMPCR |= (0x01 << 13);
PWMTCR = (1ul << 0) | (1ul << 3); /* Re-enable PWM */
> }
>
> int main(void)
> {
> // --- PWM5 setup ---
>
> // Enable P0.21 to be PWM5
> PINSEL1 |= (0x01 << 10);
> PWMTCR = 1; // enable PWM timer, let shadow register
> disabled
>
> // reset PWM timer when PWMMR0 matches
// PWMMCR = 0x2;
>
> // gives 1000Hz
> io_alarm_out(1000);
>
> while (1)
> ;
> }
>
Hallo Herbert,
Mmmmh, don't you need to turn on PWM module in PCONP? Or do you let all
peripherials active on
startup by default?
But bit #3 in PWMTCR enables PWM module. Description of this bit says:
"When one, PWM mode is enabled. PWM mode causes shadow registers..."
(2294's datasheet, p.233)
After you have enabled PWM module (if bit #3 in PWMTCR is set) and set up a
value in a PWMMRx
register you just need to set the appropriated bit in PWMLER register to take
effect of new PWMMRx
value.
You do not need using PWMLER register if you hold PWM in reset state during
changing PWMMRx values
(see changes above).
Try it!
Sten
--
/************************************************
Do you need a tiny and efficient real time
operating system (RTOS) with a preemtive
multitasking for LPC2000 or AT91SAM7?
http://nanortos.net-attack.de/
Or some open-source tools and code for LPC2000?
http://www.net-attack.de/
************************************************/
Reply by Herbert Demmel●February 24, 20062006-02-24
Hi,
I seem to miss something with setting up PWM5 output - the routine below
sometimes works, sometimes not (depending non additional code - this
versions below currentlly does NOT work).
Any idea what I miss to setup?
Thanks for your input.
Regards
Herbert
#include <LPC213x.H> /* LPC213x definitions */
#define TICKS_PER_US 15
void io_alarm_out(unsigned int freq)
{
// match register 0 controls the cycle frequency
PWMMR0 = 1000000 * TICKS_PER_US / freq;
// we want to have a duty cycle of 50% so always set PWMMR5 to
half of PWMMR0
PWMMR5 = PWMMR0 / 2;
// enable PWM5 output
PWMPCR |= (0x01 << 13);
}
int main(void)
{
// --- PWM5 setup ---
// Enable P0.21 to be PWM5
PINSEL1 |= (0x01 << 10);
PWMTCR = 1; // enable PWM timer, let shadow register
disabled
// reset PWM timer when PWMMR0 matches
PWMMCR = 0x2;
// gives 1000Hz
io_alarm_out(1000);
while (1)
;
}
----------------------
demmel products
Radnitzkygasse 43
A-1100 Vienna / Austria / Europe
Voice: +43-1-6894700-0
Fax: +43-1-6894700-40
Email: dh@dh@....
WWW: http://www.demmel.com
