You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 

39 lines
712 B

#include <avr/io.h>
#include "intervaltimer.h"
void intervaltimer_init(void)
{
TCCR1A = 0;
TCCR1B = (1<<WGM12) | (1<<CS12) | (1<<CS00); // CTC, /1024 prescaler
}
void intervaltimer_set(int interval_ms)
{
static int cur_interval = 0;
// We are setting TCNT back to zero, and updating
// the compare match register.
//
// To allows for simple repeated calling of this
// function from the main loop, only touch
// the counter when the interval changes.
if (cur_interval != interval_ms) {
cur_interval = interval_ms;
TCNT1 = 0;
OCR1A = interval_ms * (F_CPU/1024) / 1000;
}
}
char intervaltimer_get(void)
{
char a;
if (TIFR1 & (1<<OCF1A)) {
TIFR1 = 1<<OCF1A;
return 1;
}
return 0;
}