Hi List,
please use the attached code to test my previous post.
Bye, Stan.
#include <avr/io.h>
#include <avr/interrupt.h>
#include <assert.h>
#include <stdlib.h>
int main(void) {
sei(); // Enable interrupt globally
TIMSK = (1 << OCIE2); // Enable the TIMER2_COMP_vect ISR.
TCCR2 = (1 << CS20); // Start Timer2 with Prescaler set to 1.
for(;;) // Wait forever.
;
return(0);
}
ISR(TIMER2_COMP_vect) { // Ok, TIFR had it's OCF2 flag set.
assert(!(TIFR&(1<<OCF2))); // Calling this ISR clears the flag.
while(!(TIFR&(1<<OCF2))) // Let's wait until the Timer sets the flag again.
;
// Now this ISR should be in the irqPartnerList of HWIrqSystem.
// It's therefor scheduled for execution after a RETI or SEI instruction occurs.
TIFR = (1<<OCF2); // This time clear the flag manually
TCCR2 = 0; // Stop the Timer, so this ISR will never be recalled.
// But if it is recalled a 2nd time, it will hang at line 10, because the timer was stopped.
}
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