From: Robin Krens <robin@robinkrens.nl>
Date: Thu, 19 May 2022 14:52:53 +0000 (+0200)
Subject: hbc: timer with compare match output
X-Git-Url: https://robinkrens.nl/gitweb/?p=lra-as-sensor;a=commitdiff_plain;h=695d72fdf6ce4d714df79f4ac037e65cdd5ba640

hbc: timer with compare match output
---

diff --git a/hbc.c b/hbc.c
index d0169bd..5ff04c7 100644
--- 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 */