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//学习单片机技术 模拟交通灯
/*
*模拟交通灯*
*/
#include <reg51.h>
typedef unsigned char uint8;
typedef unsigned int uint16;
void delay(uint16 x)
{
uint16 i,j;
for(i = x; i > 0; i --)
for(j = 114; j > 0; j --);
}
#define RED_EW_ON() P0 &= ~0x01 //东西方向指示灯开
#define YELLOW_EW_ON() P0 &= ~0x02
#define GREEN_EW_ON() P0 &= ~0x04
#define RED_EW_OFF() P0 |= 0x01 //东西方向指示灯关
#define YELLOW_EW_OFF() P0 |= 0x02
#define GREEN_EW_OFF() P0 |= 0x04
#define RED_SN_ON() P0 &= ~0x08 //南北方向指示灯开 0000100 1111011
#define YELLOW_SN_ON() P0 &= ~0x10
#define GREEN_SN_ON() P0 &= ~0x20
#define RED_SN_OFF() P0 |= 0x08 //南北方向指示灯关
#define YELLOW_SN_OFF() P0 |= 0x10
#define GREEN_SN_OFF() P0 |= 0x20
#define YELLOW_EW_BLINK() P0 ^= 0x02 //东西方向黄灯闪烁
#define YELLOW_SN_BLINK() P0 ^= 0x10 //南北方向黄灯闪烁
uint8 Flash_Count = 0, Operation_Type = 1; //闪烁次数,操作类型变量
void Traffic_Light() //交通灯切换子程序
{
switch (Operation_Type)
{
case 1://东西方向绿灯与南北方向红灯亮
RED_EW_OFF(); YELLOW_EW_OFF(); GREEN_EW_ON();
RED_SN_ON(); YELLOW_SN_OFF(); GREEN_SN_OFF();
delay(2000); //延时
Operation_Type = 2; //下一个操作
break;
case 2://东西方向黄灯开始闪烁,绿灯关闭
delay(120);
YELLOW_EW_BLINK();
GREEN_EW_OFF();
//闪烁5次
if( ++Flash_Count != 10) return;
Flash_Count = 0;
Operation_Type = 3; //下一个操作
break;
case 3://东西方向红灯与南北方向绿灯亮
RED_EW_ON(); YELLOW_EW_OFF(); GREEN_EW_OFF();
RED_SN_OFF(); YELLOW_SN_OFF(); GREEN_SN_ON();
//南北方向绿灯亮若干秒后切换
delay(2000);
Operation_Type = 4; //下一个操作
break;
case 4://南北方向红灯开始闪烁
delay(120);
YELLOW_SN_BLINK();
GREEN_SN_OFF();
//闪烁5次
if( ++ Flash_Count != 10) return;
Flash_Count = 0;
Operation_Type = 1; //回到第一种操作
}
}
//主程序
int main()
{
while(1) Traffic_Light();
}
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