auto2.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	J1 = P2^0;

sbit	Check = P0^0;

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

 		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 = 1;
	Output =0xff;
	Delay(20);
	while(1)
	{
		if(!Check)
		{
			Delay(20);
			if(!Check)
			{
					
				if(!J1)
				{
		 			Delay(10);
					if(!J1)
					{
						temp = ~Output;
						if(!temp)
						{
							temp = 0x01;
							Output = ~temp;
							Delay(20);
						}
						else if(0<temp<3)
						{
							temp = _crol_(temp,1);
							Output = ~temp;
							Delay(20);	
						}
					}
				}
			}
			else
			{
				temp = 0;
				Output = 0xff;
			}
		}
				
	}
}