UART0, TC0, PWM & ADC at once on LPC2132

Started by soren_t_hansen November 23, 2005
Hi there

Im making a system where I'm using all the above mentioned interrupts.
I have had the TC0, PWM and the ADC running nicely until now, but when
I add the UART0 the TC0 goes dead (it's running a 1 Khz clock)

I want the UART0 to give me interrupts when it receives a byte and
only when that occours. When I send data I don't want to receive any
interrupts (It's a Master/Slave configuration where I send som
commands and the remote unit answers)

I have configured TC0 at Vic slot 0, the ADC at 1 and now the UART0 at 2.

I've read some posts that could indicate that all those interrupts
might not work together. On the other hand, it could be my init or ISR
that is wrong ...

My init and ISR for the UART0 is as follows:
void UART::init()
{
PINSEL0 |= 0x000000005; // Enable RxD0 and TxD0
U0LCR = 0x03; // 8 bits, no Parity, 1 Stop bit
U0IER = 0; // Disable UART0 RX

setBaudRate(9600); // 9600 Baud Rate @ 15MHz VPB Clock

VICVectAddr2 = (unsigned long)UART_ISR;
VICVectCntl2 = 0x20 | 6; /* UART1 Interrupt */
VICIntEnable = 1 << 6; /* Enable UART1 Interrupt */

U0FCR = 0x07; // Enable FIFOs and reset them
U0IER = 1; // Enable UART0 RX
uint32_t dummy = U0IIR; // Read IrqID - Required to Get Interrupts
Started
}

void UART::setBaudRate(uint32_t baudRate)
{
uint32_t DLreload;
//Hardcoded to 15 MHz PClk (VPBDIV = 0x0)
DLreload = static_cast<uint32_t>((15000000u / baudRate) / 16u);

U0LCR |= 0x80; /* Set DLAB */
U0DLL = DLreload;
U0DLM = (DLreload >> 8);
U0LCR &= ~0x80; /* Clear DLAB */
}

void UART_ISR(void)
{

uint8_t interruptMask = U0LSR; //Also resets interrupts in LSR

uint8_t IIR = U0IIR;

//Active low
if((IIR & 0x1) == 0)
{
//Data ready in RxBuffer
if((IIR & 0x04) != 0)
{
if(!(interruptMask & 0x01))
{
uint8_t byte = U0RBR;
//Handle byte ......
}
}
}

// Acknowledge interrupt in VIC
VICVectAddr = 0u;
}



An Engineer's Guide to the LPC2100 Series

Anyone?

--- In lpc2000@lpc2..., "soren_t_hansen" <soren_t_hansen@y...>
wrote:
>
> Hi there
>
> Im making a system where I'm using all the above mentioned interrupts.
> I have had the TC0, PWM and the ADC running nicely until now, but when
> I add the UART0 the TC0 goes dead (it's running a 1 Khz clock)
>
> I want the UART0 to give me interrupts when it receives a byte and
> only when that occours. When I send data I don't want to receive any
> interrupts (It's a Master/Slave configuration where I send som
> commands and the remote unit answers)
>
> I have configured TC0 at Vic slot 0, the ADC at 1 and now the UART0
at 2.
>
> I've read some posts that could indicate that all those interrupts
> might not work together. On the other hand, it could be my init or ISR
> that is wrong ...
>
> My init and ISR for the UART0 is as follows:
> void UART::init()
> {
> PINSEL0 |= 0x000000005; // Enable RxD0 and TxD0
> U0LCR = 0x03; // 8 bits, no Parity, 1 Stop bit
> U0IER = 0; // Disable UART0 RX
>
> setBaudRate(9600); // 9600 Baud Rate @ 15MHz VPB Clock
>
> VICVectAddr2 = (unsigned long)UART_ISR;
> VICVectCntl2 = 0x20 | 6; /* UART1 Interrupt */
> VICIntEnable = 1 << 6; /* Enable UART1 Interrupt */
>
> U0FCR = 0x07; // Enable FIFOs and reset them
> U0IER = 1; // Enable UART0 RX
> uint32_t dummy = U0IIR; // Read IrqID - Required to Get Interrupts
> Started
> }
>
> void UART::setBaudRate(uint32_t baudRate)
> {
> uint32_t DLreload;
> //Hardcoded to 15 MHz PClk (VPBDIV = 0x0)
> DLreload = static_cast<uint32_t>((15000000u / baudRate) / 16u);
>
> U0LCR |= 0x80; /* Set DLAB */
> U0DLL = DLreload;
> U0DLM = (DLreload >> 8);
> U0LCR &= ~0x80; /* Clear DLAB */
> }
>
> void UART_ISR(void)
> {
>
> uint8_t interruptMask = U0LSR; //Also resets interrupts in LSR
>
> uint8_t IIR = U0IIR;
>
> //Active low
> if((IIR & 0x1) == 0)
> {
> //Data ready in RxBuffer
> if((IIR & 0x04) != 0)
> {
> if(!(interruptMask & 0x01))
> {
> uint8_t byte = U0RBR;
> //Handle byte ......
> }
> }
> }
>
> // Acknowledge interrupt in VIC
> VICVectAddr = 0u;
> }
>




Can anyone verify that the code shown is correct?
/Sen

--- In lpc2000@lpc2..., "soren_t_hansen" <soren_t_hansen@y...>
wrote:
>
> Anyone?
>
> --- In lpc2000@lpc2..., "soren_t_hansen" <soren_t_hansen@y...>
> wrote:
> >
> > Hi there
> >
> > Im making a system where I'm using all the above mentioned interrupts.
> > I have had the TC0, PWM and the ADC running nicely until now, but when
> > I add the UART0 the TC0 goes dead (it's running a 1 Khz clock)
> >
> > I want the UART0 to give me interrupts when it receives a byte and
> > only when that occours. When I send data I don't want to receive any
> > interrupts (It's a Master/Slave configuration where I send som
> > commands and the remote unit answers)
> >
> > I have configured TC0 at Vic slot 0, the ADC at 1 and now the UART0
> at 2.
> >
> > I've read some posts that could indicate that all those interrupts
> > might not work together. On the other hand, it could be my init or ISR
> > that is wrong ...
> >
> > My init and ISR for the UART0 is as follows:
> > void UART::init()
> > {
> > PINSEL0 |= 0x000000005; // Enable RxD0 and TxD0

> > U0LCR = 0x03; // 8 bits, no Parity, 1 Stop bit
> > U0IER = 0; // Disable UART0 RX
> >
> > setBaudRate(9600); // 9600 Baud Rate @ 15MHz VPB
Clock
> >
> > VICVectAddr2 = (unsigned long)UART_ISR;
> > VICVectCntl2 = 0x20 | 6; /* UART1 Interrupt */
> > VICIntEnable = 1 << 6; /* Enable UART1 Interrupt */
> >
> > U0FCR = 0x07; // Enable FIFOs and reset them
> > U0IER = 1; // Enable UART0 RX
> > uint32_t dummy = U0IIR; // Read IrqID - Required to Get Interrupts
> > Started
> > }
> >
> > void UART::setBaudRate(uint32_t baudRate)
> > {
> > uint32_t DLreload;
> > //Hardcoded to 15 MHz PClk (VPBDIV = 0x0)
> > DLreload = static_cast<uint32_t>((15000000u / baudRate) / 16u);
> >
> > U0LCR |= 0x80; /* Set DLAB */
> > U0DLL = DLreload;
> > U0DLM = (DLreload >> 8);
> > U0LCR &= ~0x80; /* Clear DLAB */
> > }
> >
> > void UART_ISR(void)
> > {
> >
> > uint8_t interruptMask = U0LSR; //Also resets interrupts in LSR
> >
> > uint8_t IIR = U0IIR;
> >
> > //Active low
> > if((IIR & 0x1) == 0)
> > {
> > //Data ready in RxBuffer
> > if((IIR & 0x04) != 0)
> > {
> > if(!(interruptMask & 0x01))
> > {
> > uint8_t byte = U0RBR;
> > //Handle byte ......
> > }
> > }
> > }
> >
> > // Acknowledge interrupt in VIC
> > VICVectAddr = 0u;
> > }
> >
>


One question. Despite of TC0 not working does your UART_ISR receives
any byte?
I think that you should write:

if(interruptMask & 0x01)
...

or just omit this check. The check (IIR&0x04)!=0 is enough. --- In lpc2000@lpc2..., "soren_t_hansen" <soren_t_hansen@y...>
wrote:
>
> Hi there
>
> Im making a system where I'm using all the above mentioned interrupts.
> I have had the TC0, PWM and the ADC running nicely until now, but when
> I add the UART0 the TC0 goes dead (it's running a 1 Khz clock)
>
> I want the UART0 to give me interrupts when it receives a byte and
> only when that occours. When I send data I don't want to receive any
> interrupts (It's a Master/Slave configuration where I send som
> commands and the remote unit answers)
>
> I have configured TC0 at Vic slot 0, the ADC at 1 and now the UART0
at 2.
>
> I've read some posts that could indicate that all those interrupts
> might not work together. On the other hand, it could be my init or ISR
> that is wrong ...
>
> My init and ISR for the UART0 is as follows:
> void UART::init()
> {
> PINSEL0 |= 0x000000005; // Enable RxD0 and TxD0
> U0LCR = 0x03; // 8 bits, no Parity, 1 Stop bit
> U0IER = 0; // Disable UART0 RX
>
> setBaudRate(9600); // 9600 Baud Rate @ 15MHz VPB Clock
>
> VICVectAddr2 = (unsigned long)UART_ISR;
> VICVectCntl2 = 0x20 | 6; /* UART1 Interrupt */
> VICIntEnable = 1 << 6; /* Enable UART1 Interrupt */
>
> U0FCR = 0x07; // Enable FIFOs and reset them
> U0IER = 1; // Enable UART0 RX
> uint32_t dummy = U0IIR; // Read IrqID - Required to Get Interrupts
> Started
> }
>
> void UART::setBaudRate(uint32_t baudRate)
> {
> uint32_t DLreload;
> //Hardcoded to 15 MHz PClk (VPBDIV = 0x0)
> DLreload = static_cast<uint32_t>((15000000u / baudRate) / 16u);
>
> U0LCR |= 0x80; /* Set DLAB */
> U0DLL = DLreload;
> U0DLM = (DLreload >> 8);
> U0LCR &= ~0x80; /* Clear DLAB */
> }
>
> void UART_ISR(void)
> {
>
> uint8_t interruptMask = U0LSR; //Also resets interrupts in LSR
>
> uint8_t IIR = U0IIR;
>
> //Active low
> if((IIR & 0x1) == 0)
> {
> //Data ready in RxBuffer
> if((IIR & 0x04) != 0)
> {
> if(!(interruptMask & 0x01))
> {
> uint8_t byte = U0RBR;
> //Handle byte ......
> }
> }
> }
>
> // Acknowledge interrupt in VIC
> VICVectAddr = 0u;
> }
>