Lpc2000

I figured it out.  It didn't work as and irq, so I switched it to fiq
and added VICIntSelect = 1<<4; and it seems to work just fine now. 
Although I wonder why it didn't work as an irq.  And yes I know that
when the msg was first posted I had __fiq on the ISR, that was my
halfway between code, I had __irq on them originally.

--Peter

--- In lpc2000@yahoogroups.com, "peterburdine" <lordofdawn@h...> wrote:
> 
> I'm using the Keil's compiler and I'm trying to setup a system clock
> that increments every 5ms.  I am doing this by having a unsigned long
> int that gets incremented on the timer interrupt.  The timer also
> resets when the interrupt occurs.  The problem is this seems to
> somehow corrupt a few registers every once in a while and will
> generally end up in a data abort.  I believe the timer must be the
> cause because if I remove it, I no longer have these problems. 
> 
> I'd appreciate any suggestions.
> 
> The applicable code is listed here:
> 
> unsigned long int getTickCounter (void);
> void T0_ISR (void) __arm __fiq;
> unsigned long int tickCount = 0;
> 
> 
> 
> 	T0MR0 = PCLK/200; // Every 50ms
> 	T0IR = 0xF;	// Clear Interrupts on MR0	
> 	T0MCR = 0x03;  // Reset and Interrupt on MR0
> 	VICIntEnable = 1 << 4;
> 	VICVectAddr3 = (unsigned long)T0_ISR;
> 	VICVectCntl3 = 0x20 | 4;
> 	T0TCR = 0x2;	// Reset the timer
> 	T0TCR = 0x1;	// Start the timer
> 
> 
> void T0_ISR(void) __arm __fiq {
> 	tickCount++;
> 
> 	// Clear Interrupts
> 	VICVectAddr = 0;
> 	T0IR = 0x1;	
> }
> 
> 
> This is a very useful function!
> void DAbt_Handler(void) __arm __irq {
> 	Uint32 i;	
> 	// Grab the return address (location where mem access failed)
> 	__asm	{STAV R14, R0, i};
> 	printf("*****Data abort occured 0x%x *****", i);
> 	// Now just spin
> 	while(1);
> }