Lập trinh C led 7 đoạn 0000 - 9999

Video

Code

#include <REGX51.H>

#include<stdio.h>

#include<math.h>

#define bat 1

#define tat 0

#define data P2  

/****************http://www.dientuchiase.com*********************/

sbit led1=P3^0;

sbit led2=P3^1;

sbit led3=P3^2;

sbit led4=P3^3;

/************** ma led****************/

int M[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

int num=0,donvi,chuc,tram,nghin;

/******************delay**************/

void delay(int ms)

 {

  int i,j;

  for(i=0;i<ms;i++)

   for(j=0;j<125;j++)

   {

   }

  }

/***************chuyen ma**************/

void seg7(void)

 {

  nghin=num/1000;

  tram=(num%1000)/100;

  chuc=(num%100)/10;

  donvi=num%10;

  }

/**************hienthi*****************/

void hienthi(void)

 {

  data=M[nghin];

  led1=bat;

  delay(10);

  led1=tat;

  data=M[tram];

  led2=bat;

  delay(10);

  led2=tat;

  data=M[chuc];

  led3=bat;

  delay(10);

  led3=tat;

  data=M[donvi];

  led4=bat;

  delay(10);

  led4=tat;

 }

/**************ham chinh****************/

 void main(void)

 {

 while(1)

  {int k;

  for(k=0;k<20;k++)

  {

   seg7();

   hienthi();

  }

  num=num+1;

  if(num==10000)

  num=0;

  }

 }

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