Lpc2000

scrappystuff64 wrote:

>I have this code for the ADC in burst mode. The ISR is called 
>continually, but I don't see a value for the result. Gurus enlighten 
>me, what am I doing wrong?
>
>
>#include <lpc21xx.h>
>
>void AD_ISR (void) __irq
>{
>  unsigned val,chan;
>  static unsigned result[8];
>  val = ADDR;
>  chan = ((val >>0x18) & 0x07);
>  val =  (val >> 6) & 0x03FF; //Extract the A/D result
>  result[chan] = val;
>  VICVectAddr = 0; //clear the IRQ function address
>}								
>							
>	                 
>  
>
Try dumping your code (arm-elf-objdump) or look at the listings file 
(.lst). I think that you will find that the compiler has decided that 
since result[] only has a value put into it and it is otherwise unused, 
it was optimized out (dead code).

TomW

- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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