timer.c

AVR atmega64串口驱动

#define Timer_c
#include "main.h"
//***********************
//定时器T2初始化,系统核心时钟,重要重要
void timer2_init(void)
{
	TCCR2  = 0x00;//停止定时器
	ASSR   = 0x00;//异步时钟模式
	TCNT2  = 0x10;//初始值
	OCR2   = 0xF0;//匹配值
	TIMSK |= 0x80;//中断允许
	TCCR2  = 0x0D;//启动定时器 1024分频 33.333MS
}

//T2比较中断服务程序
//#pragma interrupt_handler timer2_comp_isr:5
//void timer2_comp_isr(void)
SIGNAL(SIG_OUTPUT_COMPARE2)
{
    count50ms++;
    if(count50ms==3)
	{
		count50ms=0;
		time100ms=1;
	// time100ms_n++;
		count500ms++;
		if(count500ms==5)
		{
			time500ms_n++;
			count500ms=0;
			time500ms=1;
			count1s++;
			if(count1s==2)
			{
				count1s=0;
				time1s=1;
				time1s_n++;
				count3s++;
				count30s++;
				count1m++;
				if(count3s==3)
				{
					count3s=0;
					time3s=1;
				}
				if(count30s==30)
				{
					count30s=0;
					time30s=1;	
				}
				if(count1m==60)
				{
					count1m=0;
					time1m=1;	
					count1h++;
					if(count1h==60)
					{
						count1h=0;
						time1h=1;
					}
				}
				if(sms_t)//发送短信时，开始计时
				{
					count_time_out++;
					if(count_time_out==15)
					{
						count_time_out=0;
						timeout=1;
					}
				}
				
			}
		}
	 
	}
}
//定时器初始化
void timer (void)
{
	//timer0_init();
	timer2_init();
}