Z80Atmega128

/*
 * timer.c
 *
 * Created: 2023/06/11 21:58:15
 *  Author: 46nori
 */ 
#include "timer.h"

//
//	Periodic timer (TIMER0_COMP)
//	  n = 1 to 15 ms
//
void Timer0_Init(unsigned int n)
{
	OCR0  = n * F_CPU/1024000UL;	// 1024/16MHz x Count (every 2msec)
	TCCR0 = _BV(WGM01)|				// CTC mode
	        _BV(CS02)|_BV(CS01)|_BV(CS00);	// start with 1/1024 pre-scaler
	TIFR |= _BV(OCF0);				// Interrupt every compare match
	TIMSK|= _BV(OCIE0);				// Enable interrupt
}

//
//	Periodic timer (TIMER2_COMP)
//	  n = 1 to 15 ms
//
void Timer2_Init(unsigned int n)
{
	OCR2  = n * F_CPU/1024000UL;	// 1024/16MHz x Count (every 10msec)
	TCCR2 = _BV(WGM21)|				// CTC mode
	        _BV(CS22)|_BV(CS20);	// start with 1/1024 pre-scaler
	TIFR |= _BV(OCF2);				// Interrupt every compare match
	TIMSK|= _BV(OCIE2);				// Enable interrupt
}