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CTC mode on timer 1
DAVID Posted: 19 Jan 2019, 08:27 PM
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Posts: 237
Joined: 10-September 17
 hi, i have use timers on the atmega328p and they have work fine, but now what i need to do is to set timer1 to ctc mode and use both TIMER1_COMPA_vect and TIMER1_COMPB_vect and then control their overflow time with OCR1A and OCR1B. So what i did was:

void setup() {
   TCCR1A=0;
  TCCR1B=0;
  TCCR1B|=_BV(CS12)|_BV(WGM12);
  TIMSK1|=_BV(OCIE1A)|_BV(OCIE1B);
  OCR1A=31000;
  OCR1B=500;
  pinMode(13,1);
  // put your setup code here, to run once:

}
ISR(TIMER1_COMPA_vect){
  
}
ISR(TIMER1_COMPB_vect){
  digitalWrite(13,!digitalRead(13));//blink the pin 13 led
}
void loop() {
  // put your main code here, to run repeatedly:

} 
}

and so pin 13 blinks but it is blinking at the frequency set by OCR1A and no OCR1B so it does not matter how big or small OCR1B is, TIMER1_COMPB_vect is completely depended on OCR1A.
Any suggestions?

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