Re: [avr-chat] why does ISR not always seem to run on wake from sleep?

[Rolf Pfister]

Am 08.11.2016 um 01:56 schrieb Britton Kerin:
> #define BLINK_PB5_LED_FOREVER(period_ms) \
>   do {                                   \
>     for ( ; ; ) {                        \
>       PORTB |= _BV (PORTB5);             \
>       _delay_ms (period_ms / 2.0);       \
>       PORTB &= ~(_BV (PORTB5));          \
>       _delay_ms (period_ms / 2.0);       \
>     }                                    \
>   } while ( 0 );

This do while dont make any sense, with while(0) it will
run only once. while(1) would do it forever.
Anyway the for(;;) will do the loop for ever.

>   while ( 1 ) {
>     set_sleep_mode (SLEEP_MODE_IDLE);
>     sleep_enable ();
>     sei ();
>     sleep_cpu ();
>     sleep_disable ();
>     cli ();
>
>     if ( inry ) {
>       BLINK_PB5_LED_FOREVER (100.42);   // Never seems to happen
>     }
>
>     if ( ! got_pbpci ) {
>       BLINK_PB5_LED_FOREVER (200.42);   // Always happend eventually
>     }
>     else {
>       got_pbpci = 0;
>     }
>   }

I think after reaching BLINK_PB5_LED_FOREVER it will never again
go to sleep mode. And interrupts will also not happen because
of the cli().

Rolf