se.c

进行51单片机主控智能车模块测试时用光电管返回的道路信息控制舵机以一定角度转向。

#include<reg51.h>
#define temp  P1
unsigned  char  num0=0;
unsigned char round=14;
sbit  servopwm=P2^1;
void init()
{
 	TMOD=0x21;
	EA=1;
	ET0=1;
	TH0=(65536-100)/256;
	TL0=(65536-100)%256;
	TR0=1;
	servopwm=1;
}
void main()
{ 
	init();
	while(1)
	{	
		switch(temp)					
		{	 
			case 0x7f:round=21;break;  //P0:01111111
			case 0x3f:round=20;break;  //P0:00111111
			case 0xbf:round=19;break;  //P0:10111111
			case 0x9f:round=18;break;  //P0:10011111
			case 0xdf:round=17;break;  //P0:11011111
			case 0xcf:round=16;break;  //P0:11001111
			case 0xef:round=15;break;  //P0:11101111	
			case 0xf7:round=13;break;  //P0:11110111
		    case 0xf3:round=12;break;  //P0:11110011
			case 0xfb:round=11;break;  //P0:11111011
			case 0xf9:round=10;break;  //P0:11111001
			case 0xfd:round=9;break;  //P0:11111101
		    case 0xfc:round=8;break;   //P0:11111100
			case 0xfe:round=7;break;   //P0:11111110
		    default:break;	
		}		
	}
}
void timer0() interrupt 1                             
{ 
	TH0=(65536-100)/256;
	TL0=(65536-100)%256;
	 num0++;
	if(num0==round)
	  servopwm=0;
	if(num0==200)
	{	
	servopwm=1;
	  num0=0;
	}
}