Lpc2000

Hi,

we could do with the function UART0_init from your code, however I suspect
your problem is that you're not reading U0IIR to clear the UART IRQ. You
also have a huge delay inside your IRQ which kind of defeats the point of
using it. Have a look at the description of U0IIR register.

Here is a working example from a 2129 which should work equally well on your
chip with minor modification:

void main(void)
{
  // init the serial ports
  init_serial();

  // main loop
  while(1)
  {
    for(;;);
  }
}

void init_serial (void)    	// Initialize Serial Interface
  {

  //UART0
  VPBDIV  = 0x00000001;	    //Set PClk to 60Mhz
  PINSEL0 = 0x00000005;     //Enable TxD0, RxD0

  U0LCR   = 0x00000083;     //8 bits, no Parity, 1 Stop bit
  U0DLL   = 0x00000084;     // 9600 Baud Rate @ 60MHz VPB Clock
  U0DLM   = 0x00000001;
  U0LCR   = 0x00000003;     // DLAB = 0
  U0IER   = 0x00000001;     //enable rx data available interrupt

  VICVectCntl1 = 0x00000026;
  VICVectAddr1 = (unsigned)uart0_irq;
  VICIntEnable |= 0x00000040;

  U0FCR   = 0x00000001;		//Enable FIFO & trigger level to 1 bytes
}

static unsigned int U0IIR_copy;

void uart0_irq(void) __irq
{
  //check for a character from the UART0 RX FIFO
  if((U0LSR & 0x01) == 0x01)  //if there is a character
  {
    toggle_LED(1);		//do this to suit your board
  }

  //exit ISR
  U0IIR_copy = U0IIR;
  VICVectAddr = 0x00000000; 	//dummy write to re-enable interrupt for next
time
}



-----Original Message-----
From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com]On Behalf
Of grodo2k
Sent: 21 March 2006 11:38
To: lpc2000@yahoogroups.com
Subject: [lpc2000] interrupts + Keil + LPC2294


Hello
could someone be so kind and say, what is wrong in following code? Or
maybe it is ok, but it doesn't work... I want trigger an interrupt
using UART0. I am using Keil. (UART0 is ok, it sends a string from tab).

thanks in advance

int i,j;
char tab[] = "UART0 is working properly";

void UART0INT() __irq
{
	IO0CLR |= 0x20000;  //clr P0.17 (it's a LED)
	for(i=0;i<5;i++)
	{
		for(j=0;j<50000;j++){}
	}
	send_char_u0('A');
	VICVectAddr = 0x00000000; //dummy write
}

int main(void)
{
	PLL_ON();
	LED_init();
	VPBDIV = 0x1;
	UART0_init();
	IO0SET |= 0x20000;  //set P0.17
	send_string_u0(tab);
	VICIntSelect = 0x00000000;
	VICVectAddr0 = (unsigned) UART0INT;
	VICVectCntl0  = 0x26;	//UART0
	VICIntEnable = 0x40;		//bit 6 = UART0
	while(1)
	{

	}

	return 0;

}






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