Lpc2000

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@yahoogroups.com, "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; 
>   }
>