Lpc2000

peter

i think also that you need to initialise the isr function 
differently...
something like this:
void uart0_isr(void) __attribute__ ((interrupt("IRQ")));

rather than:
void uart0_isr (void);

see the user manual section on interrupt handling....

also, add the:
 VICVectAddr = 0;//Dummy write to signal end of interrupt

to the end of the isr...
does this help?

kind regards
Pete


--- In lpc2000@yahoogroups.com, "peterburdine" <lordofdawn@h...> 
wrote:
> 
> I am sure the might help, if the ISR was called in the first 
place. 
> But it isn't.
> Also, according to the user manual I have,, it states that only 
U0IIR
> must be accessed to clear the IRQ (for TXRE anyways).
> 
> --Peter
> 
> --- In lpc2000@yahoogroups.com, "Pete" <peterbrown_abroad@y...> 
wrote:
> > 
> > In an interrupt service routine:
> > in order to exit it properly you must, Clear the interrupt flag 
that 
> > triggered it (write a 1 to the flag?) eg:
> > U0IIR 	= 0x0000000A;	//Clear the interrupt register
> > 
> > anyway, most importantly you also need to write to teh vector 
> > address register:
> > eg:
> > VICVectAddr 	= 0x00000000;//Dummy write to signal end of 
interrupt
> > 
> > failure to do these will lead to continuous interrupts.....
> > 
> > 
> > Does this help???
> > 
> > rgds
> > pete
> > 
> > 
> > --- In lpc2000@yahoogroups.com, "peterburdine" <lordofdawn@h...> 
> > wrote:
> > > 
> > > I think I may be missing something stupid, but can anyone help 
me?
> > > I am tring to write to UART0, but it doesn't seem to work.  I 
am
> > > trying to write a software buffer to help out the one byte 
hardware
> > > buffer.  Specifically I am using the LPC 2294.  Below is my 
code.
> > > 
> > > I am using the Keil toolset (compiler/debugger/simulator).  
The 
> > code
> > > works perfectly fine when running it on the simulator, but 
when I 
> > try
> > > to run it on the chip, I will only get "ho" instead 
of "hello".  I 
> > put
> > > some break points in it when using JTAG to debug, but the ISR 
is 
> > never
> > > called when running on the real hardware, it is called on the
> > > simulator.  Also, when I debug on JTAG I never se the THRE or 
TEMT
> > > clear.  Can you see anything obviously wrong?  I think I put in
> > > everything that you need to compile it.
> > > 
> > > #include <stdio.h>
> > > #define TX_BUFFER_LENGTH 64
> > > #define UART0_THRE			(U0LSR & 0x20)
> > > #define		PINSEL0_00_TxD		(0x01)
> > > #define		PINSEL0_01_GPIO		(0x00 << 2)
> > > #define U0RBR          (*((volatile unsigned char *) 
0xE000C000))
> > > #define U0THR          (*((volatile unsigned char *) 
0xE000C000))
> > > #define U0IER          (*((volatile unsigned char *) 
0xE000C004))
> > > #define U0IIR          (*((volatile unsigned char *) 
0xE000C008))
> > > #define U0FCR          (*((volatile unsigned char *) 
0xE000C008))
> > > #define U0LCR          (*((volatile unsigned char *) 
0xE000C00C))
> > > #define U0MCR          (*((volatile unsigned char *) 
0xE000C010))
> > > #define U0LSR          (*((volatile unsigned char *) 
0xE000C014))
> > > #define U0MSR          (*((volatile unsigned char *) 
0xE000C018))
> > > #define U0SCR          (*((volatile unsigned char *) 
0xE000C01C))
> > > #define U0DLL          (*((volatile unsigned char *) 
0xE000C000))
> > > #define U0DLM          (*((volatile unsigned char *) 
0xE000C004))
> > > #define VICVectAddr6   (*((volatile unsigned long *) 
0xFFFFF118))
> > > #define VICVectCntl6   (*((volatile unsigned long *) 
0xFFFFF218))
> > > #define VICIntSelect   (*((volatile unsigned long *) 
0xFFFFF00C))
> > > #define VICIntEnable   (*((volatile unsigned long *) 
0xFFFFF010))
> > > #define VICIntEnClr    (*((volatile unsigned long *) 
0xFFFFF014))
> > > static Uint16	txBytes = 0;
> > > static Uint16	txRdPos = 0;
> > > static Uint16	txWrPos = 0;
> > > static Uint16	txBuffer[TX_BUFFER_LENGTH];
> > > 
> > > void uart0_config (void);
> > > void uart0_isr (void);
> > > void uart0_sendByte (Uint8);
> > > int putchar(int);
> > > int main (void);
> > > 
> > > void uart0_config (void) {
> > > 	// Setup UART 0
> > > 	U0LCR = 0x80; // Enable DLAB
> > > 	U0DLL = 0x16; // Setup BGR
> > > 	U0DLM = 0x05; // ~2400 Bit/s @ 50 Mhz
> > > 	U0LCR = 0x03; // Enable UART 0, 8 bits, no parity, 1 stop bit
> > > 
> > > 	// Reset the FIFOs
> > > 	U0FCR = 0xC7; // RX FIFO trigger level 8 chars, reset tx and 
> > rx fifo,
> > > enable fifos
> > > 
> > > 	// Setup Interrupts for UART0
> > > 	U0IER = 0x7;
> > > 	VICIntSelect &= 0x0;
> > > 	VICVectCntl6 = 0x20 | 6;
> > > 	VICVectAddr6 = (unsigned long) uart0_isr;
> > > 	VICIntEnable |= (0x1 << 6); // Enable Uart0 Interrupt	
> > > }
> > > 
> > > void uart0_isr (void) __irq {
> > > 	switch((U0IIR>>1)&0x7) {
> > > 		// THRE
> > > 		case	001:
> > > 			if(txBytes != 0) {
> > > 				U0THR = txBuffer[txRdPos];
> > > 				txRdPos++;
> > > 				txRdPos = (txRdPos == 
> > TX_BUFFER_LENGTH)?0:txRdPos;
> > > 				txBytes--;
> > > 			}
> > > 			break;
> > > 	}
> > > }
> > > 
> > > void uart0_sendByte(Uint8 byte) {
> > > 	// Wait until there is room in the buffer
> > > 	while(txBytes == TX_BUFFER_LENGTH);
> > > 	VICIntEnClr |= (1 << 6);
> > > 	if(!UART0_THRE) {  // Put it in the software buffer 
> > > 		txBuffer[txWrPos] = byte;
> > > 		txWrPos++;
> > > 		txWrPos = (txWrPos == TX_BUFFER_LENGTH)?0:txWrPos;
> > > 		txBytes++;
> > > 	}
> > > 	else { // If the chip buffer is empty, put it there
> > > 		U0THR = byte;	
> > > 	}
> > > 	VICIntEnable |= (1 << 6);
> > > }
> > > 
> > > int putchar(int a) {
> > > 	uart0_sendByte((int)a);
> > > }
> > > 
> > > int main (void) {
> > > 	PINSEL0 = PINSEL0_00_TxD | PINSEL0_01_RxD; 
> > > 	printf("hello");
> > > }