1.c

一个小型的数控电源的源码

#include"at89x51.h"

void ms(unsigned int Delay)
{
	unsigned int a;
  	for(;Delay>0;Delay--)
  	{
		for(a=0;a<114;a++){;}
  	}
}
  
void main(void)
{
 	unsigned char a;
 	unsigned char shu[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; 
 	P2=0;
 	P3=255;
 	while(1)
 	{
  		P2=a;
  		ms(300);
  		while(1)
  		{
   			P0_3=0;
   			P1=shu[a/200];
   			ms(1);
   			P0_3=1; 
			
			P0_2=0;
   			P1=shu[a/20%10]-128;
   			ms(1);
   			P0_2=1;  

   			P0_1=0;
   			P1=shu[a/2%10];
   			ms(1);
   			P0_1=1;
 
   			P0_0=0;
   			P1=0xc1;
   			ms(1);
   			P0_0=1;

   			if(!P3_2||!P3_0||!P3_3) break;
  		}
  		if(!P3_3) 
  		{
   			if(a>20) a-=20;
   			else a=0;
  		}
  		if(!P3_0)
  		{
   			if(a<=220) a+=20;
   			else a=240;
  		}
  		if(!P3_2&&a<=238) a+=2;
 	}
}