daojishi.zip_ATMEGA8 定时器_atmega8_atmega8定时

#include <avr/io.h> #include <util/delay.h> #include <avr/interrupt.h> //中断函数头文件 #include <avr/eeprom.h> //EEPROM头文件 //全局变量声明 #define SET_1(a,b) a|=(1<<b) #define CLE_0(a,b) a&=~(1<<b) #define uchar unsigned char #define uint unsigned int #define ulong unsigned long //函数声明 uchar Disp_Buff[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar LedOut[3]; uchar s,f; volatile uint sj; volatile uchar j; void Port_Init() { DDRB=0xFF; //转换口设置为输入、无上拉 PORTB=0x00; DDRC = 0XFF; // PORTC = 0XFF; // DDRD = 0X3F; //K3、K4按键(PD6、PD7)设置为输入端口 PORTD = 0XFF; } void smg(uint sjs) { uint i; LedOut[0]=Disp_Buff[sjs%1000/100]; LedOut[1]=Disp_Buff[sjs%100/10]; LedOut[2]=Disp_Buff[sjs%10]; for(i=0; i<3; i++) { SET_1(PORTC,0); SET_1(PORTC,1); SET_1(PORTC,2); PORTB = LedOut[i]; switch(i) { case 0:CLE_0(PORTC,0); break; case 1:CLE_0(PORTC,1); break; case 2:CLE_0(PORTC,2); break; } _delay_ms(2); PORTB = 0x00; } } void T1_init(void) { cli();//禁止全局中断 TCNT1=0XE17A;//溢出时间为 500ms TIMSK|=(1<<TOIE1);//允许 T1 中断 TCCR1B|=(1<<CS11)|(1<<CS10);//64分频 sei();//开全局中断 } SIGNAL(TIMER1_OVF_vect)//T0 中断服务程序 { TCNT1=0XE17A;//重装初值 TIMSK=CLE_0(TIMSK,TOIE1);//关闭中断// if(++j>= 2) {sj++;j=0;} TIMSK=SET_1(TIMSK,TOIE1);//开总中断 if(sj==1000) {sj=0; TIMSK=CLE_0(TIMSK,TOIE1);//关闭中断// CLE_0(PORTC,5); } } void main(void) { eeprom_busy_wait(); s=eeprom_read_byte(0x00); eeprom_busy_wait(); f=eeprom_read_byte(0x01); sj=s*60+f; if (sj==0)eeprom_busy_wait();eeprom_write_byte(1,0x10);sj=0; Port_Init(); j=0; T1_init();//中断初始化 while(1) { smg(sj); if (PIND==0x7F) { TIMSK=SET_1(TIMSK,TOIE1);//开总中断 SET_1(PORTC,5); } } }