time_master.c

来自「用ICC编写的程序包括SPI」· C语言 代码 · 共 51 行

#include "time_master.h"

unsigned char timeflag;
unsigned char dispflag;
unsigned char disp_cnt;

//TIMER0 initialize - prescale:256
// WGM: Normal
// desired value: 5mSec
// actual value:  4.965mSec (0.7%)
void timer0_init(void)
{
 TCCR0 = 0x00; //stop
 TCNT0 = 0x71; //set count
 OCR0  = 0x8F;  //set compare
 TCCR0 = 0x04; //start timer
 timeflag=1;
}

#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
 TCNT0 = 0x71; //reload counter value
 timeflag=1;
}

//TIMER2 initialize - prescale:256
// WGM: Normal
// desired value: 5mSec
// actual value:  4.965mSec (0.7%)
void timer2_init(void)
{
 TCCR2 = 0x00; //stop
 ASSR  = 0x00; //set async mode
 TCNT2 = 0x00; //setup
 OCR2  = 0xD7;
 TCCR2 = 0x07; //start
 dispflag=0;
 disp_cnt=0;
}

#pragma interrupt_handler timer2_ovf_isr:5
void timer2_ovf_isr(void)
{
 TCNT2 = 0x00; //reload counter value
 if(disp_cnt++>100)
 {
 disp_cnt=0;
 dispflag=1;
 }
}