Lpc2000

At 03:07 PM 6/28/2005, chabely_k99 wrote:

>Does anyone have a simple example including a startup.s file that I
>can compile in GCC that demonstrates how to use interrupts? I've
>looked at and have tried many examples. I can get the interrupt to
>fire once but never again. I think the interrupt isn't being reset
>correctly within the ISR. I'm usings the following ISR function. I
>can get the ISR to work correctly using the Imagecraft ARM compiler.
>Same LED.c file but different startup.s file. The Imagecraft compiler
>is doing something behind the scenes that allow the interrupts to
>work that I don't understand.

No, we don't do anything behind the scene. We just have good examples etc. 
There are some tricks to use the VIC, read the examples and docs carefully.


>void TimerMatch( void ) __attribute__ ((interrupt ("IRQ")));
>void TimerMatch( void )
>     {
>         p+=1;
>         LED_OFF ;
>
>     TIMER0_IR = 0x1;   // clr Timer interrupt
>     VICVectAddr = 0xFF;
>
>     }
>
>Thanks!

// richard (This email is for mailing lists. To reach me directly, please 
use richard at imagecraft.com)