main__.c

这是一个AVRM16的定时器制的例子,比较适合初学者.

#include "MEGA16.h" 
#include "INIT.h"   
#include "DISPLAY.h" 
#include "KEY.h"
uint    time_sec_add=0;
//******************************中断函数************************************   
//定时器1中断函数
interrupt [TIM1_OVF] void timer1_capt_isr(void)//1mS
{
	TCNT1H = 0xE3; //reload counter high value
	TCNT1L = 0x34; //reload counter low value 
	flash_add+=1;
	if(flash_add>=1000)
	        flash_add=0;
	if(b_time)
	        time_sec_add+=1;
	if(time_sec_add>=1000)   //1秒
	{       b_sec=~b_sec;  
	        sec+=1;
	        time_sec_add=0;
	}
	if(sec>=60)              //1分
	{     
	        min+=1;
	        sec=0;
	} 
	if(min>=60)             //1小时
	{
	        hour+=1;   
	        min=0;
	}             
        if(hour>99)
        {
                hour=99; 
        } 
        if((hour>=sethour)&&(min>=setmin))
        {
                b_time=0;
                b_sec=1;
                LED=0xef; 
        }
}     

//******************************主函数************************************ 
void main(void)
{       
	init_devices(); 
	sethour=   eeprom_shu[0];
	setmin=    eeprom_shu[1];
	hour=   eeprom_shu[2];
	min=    eeprom_shu[3];
	sec=    eeprom_shu[4];
	LED=    eeprom_shu[5]; 
	b_time=    eeprom_shu[6]; 
	while (1)
	{
		#asm("wdr")  
		if(!(PINC & (1<<PC6)))  
		{
                        show(); 
                        key();
                }
                else
                {       
                        PORTA=0X00;
                        eeprom_shu[0]=sethour;
                        eeprom_shu[1]=setmin;
                        eeprom_shu[2]=hour;
                        eeprom_shu[3]=min;
                        eeprom_shu[4]=sec; 
                        eeprom_shu[5]=LED; 
                        eeprom_shu[6]=b_time; 
                }
                
	}               
}