hbc: internal vref + switch off interrupts after detect

diff --git a/hbc.c b/hbc.c
index c5c2c0d..38332a1 100644 (file)
--- a/hbc.c
+++ b/hbc.c
@@ -13,6 +13,7 @@ ISR(SIG_COMPARATOR)
 {
        if (ACSR & (1 << ACO)) {
                PORTB |= (1 << PB4);
+               ACSR &= ~(1 << ACIE);
        } else {
                PORTB &= ~(1 << PB4);
        }
@@ -22,7 +23,6 @@ EMPTY_INTERRUPT(TIM0_COMPA_vect);
 
 static void switch_idle(void)
 {
-       sei();
        set_sleep_mode(SLEEP_MODE_IDLE);
        sleep_mode();
 }
@@ -55,7 +55,7 @@ static void config_comparator(void)
        //ADMUX |= (1 << MUX0); /* ADC1 as negative input */
        
        ACSR &= ~(1 << ACD); /* enable comparator */
-       //ACSR |= (1 << ACBG);
+       ACSR |= (1 << ACBG);
        //ACSR |= (1 << ACIS1) | (1 << ACIS0);
 
        DIDR0 |= (1 << AIN1D) | (1 << AIN0D);
@@ -74,6 +74,7 @@ int main(void)
        //set_ref_voltage();
        config_comparator();
        sei();
+       switch_idle();
 
        while(1) {
                _delay_ms(100);