src/debug.c


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#include <avr/io.h>
#include <stdio.h>
#include <util/delay.h>
#include "debug.h"


/*
 * TCNTn: timer/counter
 * TCCRnA/B/C: timer/counter control registers
 */
void timer_init() {
  TCCR1A = 0;         //no waveform generation or something like that
  TCCR1B = _BV(CS00); //no prescaling; use internal clock
  TCCR1C = 0;
}

//makes it easier to print time; is an unsigned int and NOT to be used for more then printing
unsigned int ticks_to_seconds(uint16_t start, uint16_t end) { 
  return ((unsigned int)(end - start) / F_CPU);
}

void test_timer() {
  uint16_t start, end;
  start = TCNT1;
  _delay_ms(1000);
  end = TCNT1;
  printf("1 second is %u ticks\n",  end - start);
}