nes-proj/cpu/arm/at91sam7s/pit-interrupt.h

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2009-07-11 14:22:45 +00:00
volatile unsigned int pit_count = 0;
static void NACKEDFUNC ATTR system_int (void) { /* System Interrupt Handler */
ISR_ENTRY();
if (*AT91C_PITC_PISR & AT91C_PITC_PITS) { /* Check PIT Interrupt */
pit_count++;
/*
if ((pit_count % 100) == 0) {
unsigned int led_state = (pit_count % 300) / 100;
*AT91C_PIOA_ODSR = ~(1<<led_state);
}
*/
*AT91C_AIC_EOICR = *AT91C_PITC_PIVR; /* Ack & End of Interrupt */
} else {
*AT91C_AIC_EOICR = 0; /* End of Interrupt */
}
ISR_EXIT();
}