p7_2.c

单片机原理与应用实例教程 单片机原理与应用实例教程

/*开机红灯全亮，--1南北红，东西黄2南北红，东西绿3南北黄，东西红4南北绿，东西红循环*/
#include "REG51.h"

void Delay()
{
	unsigned char i, j, k;
	for( i = 0; i < 0xff; i ++ )
	{
		for( j = 0; j < 0xff; j ++ )
		{
			//for( k = 0; k < 0x5; k ++ )
			//{
			//}
		}
	}
}

sbit	RedLight	= P1^0;
sbit	YellowLight	= P1^1;
sbit	GreenLight	= P1^2;

sbit	RedLight2	= P1^5;
sbit	YellowLight2= P1^6;
sbit	GreenLight2	= P1^7;
main(){
	unsigned char type = 0;
	/*type = 0 红灯亮，type=1 黄灯亮，type=2绿灯亮，type=3黄灯亮*/
	
	while(1)
	{
		if( type == 0 ) 			
        {
            RedLight 		= 1;
			YellowLight 	= 0;
			GreenLight 		= 0;
			RedLight2 		= 1;
			YellowLight2 	= 0;
			GreenLight2 	= 0;  
			Delay();
			Delay();      
        }
		else if( type == 1 || type == 3 ) 
        {
			RedLight 		= 0;
			YellowLight  	= 1;
			GreenLight 		= 0;
			RedLight2 		= 0;
			YellowLight2 	= 1;
			GreenLight2  	= 0; 
			Delay();       
        }
        else
        {
			RedLight 		= 0;
			YellowLight 	= 0;
			GreenLight 		= 1;
			RedLight2 		= 0;
			YellowLight2 	= 0;
			GreenLight2 	= 1;   
			Delay();
			Delay();     
        }
		type ++;
		if( type >= 4 )
			type = 0;
    }      
}