hbc: timer with compare match output

diff --git a/hbc.c b/hbc.c
index d0169bd..5ff04c7 100644 (file)
--- a/hbc.c
+++ b/hbc.c
@@ -14,14 +14,18 @@ volatile int xvar = 1;
  * return PC after latest sleep_mode() call */
 EMPTY_INTERRUPT(SIG_COMPARATOR);
 
-ISR(TIM0_OVF_vect)
+ISR(TIM0_COMPA_vect)
+{      
+       xvar++;
+}
+ISR(TIM0_COMPB_vect)
 {
        xvar++;
 }
 
-/* for debugging purposes */
-ISR(BADISR_vect) 
+ISR(TIM0_OVF_vect)
 {
+       //xvar++;
 }
 
 
@@ -43,19 +47,20 @@ static void init_board(void)
 
 int main(void)
 {
-       
        init_board();
-
-       xvar = 1;
+       xvar = 1;       
        cli();
-       TCCR0A = 0x00;
-       TCCR0B = (1 << CS00) | (1 << CS02);
+       DDRB |= (1 << DDB0); /* set PB0 as output */
+       TCCR0A = TCCR0B = 0;
+       TCCR0A |= (1 << WGM01) | (1 << WGM00) | (1 << COM0A1);
+       TCCR0B |= (1 << CS02) | (1 << CS00); /* clk/1024 prescaler */
+       OCR0A = 0x7F; /* 50% duty cycle */
        TCNT0 = 0;
-       TIMSK |= (1 << TOIE0);
+       TIMSK = (1 << OCIE0A) | (1 << OCIE0B) | (1 << TOIE0); /* enable interrupts for overflow and compare */
        sei();
 
        while(1) {
-
+               _delay_ms(100);
                /* set LRA as sensor and switch to idle mode
                 * check back-EMF of LRA: if treshold is surpassed
                 * comparator intterupt is triggered */