auto.c

自动量程电压电流表

#include <reg51.h>
#include <intrins.h>
#define	Uchar	unsigned char	


/***********定义单片机端口*************/

#define	Output	P1

sbit	Check =	P0^0;
sbit	J1 = P2^0;
sbit	J2 = P2^1;

/**************************

 		延时子程序

***************************/

void 	Delay( Uchar t )
{
	
	Uchar i,j,k;
	for( k=t;k>0;--k )
	{	
	
		for( i=2;i>0;--i )
		  	for( j=245;j>0;--j ); 

	}

}


void main( )
{
	Uchar temp;
	J1 = J2 = 1;
	Output =0xff;
	Delay(20);
	while(1)
	{
		if(!Check)
		{
			Delay(10);
			if(!Check)
			{
				Delay(10);
				if(J1 && J2)
				{
					temp = ~Output;
					if(temp<2)
					{
						temp++;
						Output = ~temp;
					}
				}
				Delay(10);
				if(!J1 && !J2)
				{
					temp = ~Output;
					if(2>temp>0)
					{
						temp--;
						Output = ~temp;
					}
				}
			}
		}
		else
		{
			J1 = J2 = 1;
			Output =0xff;
			temp = 0;	
		}	
	}
}