AVR定时器控制交通灯.doc

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1、//------------------------------------------------------------------//定时器Timer1练习，用定时器1模拟控制交通灯，定时时间为0.5s//外部定时器，内部时钟1MHz，即1秒时间内有1M次计数次数//---------------------------------

2、//1、东西向绿灯与南北向红灯亮5s;

3、//2、东西向绿灯灭，黄灯闪烁5次;

4、//3、东西向红灯与南北向绿灯亮5s;

5、//4、南北向绿灯灭，黄灯闪烁5次

6、//编译环境：IAR//-------

7、--------------------------

8、---------------------------------#include#defineuint_8unsignedchar#defineuint_16unsignedintuint_8operation_type=1,Time_Count=0;#defineGREEN_EW_ON()PORTC&=~(1<<2)//东西向指示灯打开#defineYELLOW_EW_ON()PORTC&=~(1<<1)#defineRED_EW_ON()PORTC&=

9、~(1<<0)#defineGREEN_EW_OFF()PORTC

10、=1<<2//东西向指示灯关闭#defineYELLOW_EW_OFF()PORTC

11、=1<<1#defineRED_EW_OFF()PORTC

12、=1<<0#defineGREEN_SN_ON()PORTC&=~(1<<5)//南北向指示灯打开#defineYELLOW_SN_ON()PORTC&=~(1<<4)#defineRED_SN_ON()PORTC&=~(1<<3)#defineGREEN_SN_OFF()PORTC

13、=1<<5//南北向指示灯关闭#d

14、efineYELLOW_SN_OFF()PORTC

15、=1<<4#defineRED_SN_OFF()PORTC

16、=1<<3#defineYELLOW_EW_BLINK()PORTC^=(1<<1)#defineYELLOW_SN_BLINK()PORTC^=(1<<4)voidtimer_init(){TCCR1B=0x04;//定时器1设置为256分频TCNT1=65536-(/2)/256;TIMSK

17、=(1<<2);//打开定时器0和定时器1的中断使能位SREG=0x80;//打开全局中断}intmain(){DDRC=0

18、xff;PORTC=0xff;timer_init();while(1);}#pragmavector=TIMER1_OVF_vect__interruptvoidTIMER1_server(void){TCNT1=65536-(/2)/256;//YELLOW_EW_BLINK();switch(operation_type){case1:GREEN_EW_ON();YELLOW_EW_OFF();RED_EW_OFF();RED_SN_ON();GREEN_SN_OFF();YELLOW_SN_OFF();if(++Time

19、_Count!=10)return;Time_Count=0;operation_type=2;break;case2:GREEN_EW_OFF();YELLOW_EW_BLINK();if(++Time_Count!=10)return;Time_Count=0;operation_type=3;break;case3:RED_EW_ON();GREEN_EW_OFF();YELLOW_EW_OFF();GREEN_SN_ON();YELLOW_SN_OFF();RED_SN_OFF();if(++Time_Count!=10

20、)return;Time_Count=0;operation_type=4;break;case4:GREEN_SN_OFF();YELLOW_SN_BLINK();if(++Time_Count!=10)return;Time_Count=0;operation_type=1;break;}}