Hi all,

I'm facing with spureos interrupt in some occasions, I modified the default spurious interrupt handler in my application with the following code:

void defaultSpuriousHandler( void )
{

spurious = AT91C_BASE_AIC->AIC_SPU;
*AT91C_AIC_EOICR = *AT91C_AIC_EOICR;

return;

}

Inmediately after the code is finished, I check if a spureos interrupt has happened, if so, I enable the CAN interrupt so the original interruption is handled properly, as I can't simply discard that interruption. But I'm not dure if I'm losing it, or whether I should make any other action.

The following code shows you how I manage when I try to disable the interrupt, and how to detect if a spurious interrupt happended:

//Wait for pending register to be clear, so we decrease the number of spurious
do {
}while (AT91C_BASE_AIC->AIC_IPR != 0);

//Once we know that there is no interrupt pending, we try to disable the CAN interrrupt
//And start the critical section
//only disable the CAN interrupt because I know that there is no other interrupt happening
AT91C_BASE_AIC->AIC_IDCR = 1 << AT91C_ID_CAN;

//This is a little weird, but I checked that this value tells me that the spurious exception happened
if (spurious != 0 )
{
//If a spurious interrupt happened I enable the interrupt so the original interrupt
//will be handled by the CAN handler so I'm not losing CAN messages

AT91C_BASE_AIC->AIC_IECR = 1 << AT91C_ID_CAN;
spurious = 0;
return -1; // We finished the method and try later to run the critical section
}
Thank you very much for your help.

Javier Barbarán.