Working with interrupts on LPC2129

Thanks for the code, for the most part what I came up with was (about) the same. I am not using printf and therefor have not added syscalls.c to my project. Also adding that file will require some work on my part as I have three different put/get-char calls (et al. putchar_uart0, putchar_uart1, putchar_i2c) but no get/put char as required in syscalls.c.

My code is not performing correctly regarding the interrupts for uart1. I'll post the code here and also in a new thread for possible extra help.

First of all, here is the main loop...

	while(1)  {

		cTemp = getchar_uart1();
		if( cTemp )
			putchar_uart1( cTemp );
		cTemp = 0;

	}

void u1_interrupt (void) __attribute__ ((interrupt));   /* generate interrupt */

/*************************************************************************/
/**************************  interrupt for uart1  ************************/
void u1_interrupt (void)  {
	char intrpt;
	intrpt = U1IIR;   /* reset U1IIR register */
// for now just trying to echo the Rx'd byte back out uart1...
	intrpt = U1RBR;	// clear Rx buffer, and reset interrupt
	putchar_uart1( intrpt );

	VICVectAddr = 0;   /* acknowledge interrupt */
}/*end u1_interrupt() */



void init_uart1( void )  {
	PINSEL0 |= 0x00550000;   /* set P0.8, P0.9, P0.10 and P0.11 as TxD1, RxD1, RTS1, CTS1 */
	U1LCR = 0x83;   /* set DLAB and word size (8bits), defaults for others yield */
						 /* no parity, one stop bit, and no break */
	U1DLL = 0x61;   /* yields 9600 Baud */
	U1DLM = 0x00;   /* explicit initialization - is also the default */
	U1LCR &= 0x7f;   /* clear DLAB */

/* set up the interrupts */
	U1IER = 0x05;   /* enable RBR and RLS interrupts */
	VICVectAddr1 = (unsigned long) u1_interrupt;   /* set interrupt vector */
	VICVectCntl1 = 0x20 | 7;   /* use VICVectAddr1 for UART1 interrupts */
	VICIntEnable = 0x00000080;   /* enable uart1 interrupts */

}/* end init_uart1()

Thanks for the code, for the most part what I came up with was (about) the same. I am not using printf and therefor have not added syscalls.c to my project. Also adding that file will require some work on my part as I have three different put/get-char calls (et al. putchar_uart0, putchar_uart1, putchar_i2c) but no get/put char as required in syscalls.c.

My code is not performing correctly regarding the interrupts for uart1. I'll post the code here and also in a new thread for possible extra help.

First of all, here is the main loop...

	while(1)  {

		cTemp = getchar_uart1();
		if( cTemp )
			putchar_uart1( cTemp );
		cTemp = 0;

	}

void u1_interrupt (void) __attribute__ ((interrupt));   /* generate interrupt */

/*************************************************************************/
/**************************  interrupt for uart1  ************************/
void u1_interrupt (void)  {
	char intrpt;
	intrpt = U1IIR;   /* reset U1IIR register */
// for now just trying to echo the Rx'd byte back out uart1...
	intrpt = U1RBR;	// clear Rx buffer, and reset interrupt
	putchar_uart1( intrpt );

	VICVectAddr = 0;   /* acknowledge interrupt */
}/*end u1_interrupt() */



void init_uart1( void )  {
	PINSEL0 |= 0x00550000;   /* set P0.8, P0.9, P0.10 and P0.11 as TxD1, RxD1, RTS1, CTS1 */
	U1LCR = 0x83;   /* set DLAB and word size (8bits), defaults for others yield */
						 /* no parity, one stop bit, and no break */
	U1DLL = 0x61;   /* yields 9600 Baud */
	U1DLM = 0x00;   /* explicit initialization - is also the default */
	U1LCR &= 0x7f;   /* clear DLAB */

/* set up the interrupts */
	U1IER = 0x05;   /* enable RBR and RLS interrupts */
	VICVectAddr1 = (unsigned long) u1_interrupt;   /* set interrupt vector */
	VICVectCntl1 = 0x20 | 7;   /* use VICVectAddr1 for UART1 interrupts */
	VICIntEnable = 0x00000080;   /* enable uart1 interrupts */

}/* end init_uart1()

I thought it worth mentioning that I can see the Rx Data Ready interrupt triggering when I am single stepping in the debug mode but flow does NOT jump it my ISR.

also FYI: with regards to posting code... use the

</per> tags to retain formatting

"</per> tags to retain formatting"

That should be < pre > (to start) and < /pre > (to end) - but without the extra spaces.

It's clearly shown at the top of the form when you make a post!

excuse my typos... I got the first one correct which was why it wasn't displayed which is also why you put the spaces between the brackets (I hadn't thought of that either)