一 功能描述
数码管循环显示1000-3000
数码管显示数字0，显示带小数点的 7
二 程序
#include "reg52.h"
sbit C1 = P2^7;
sbit C2 = P2^6;
sbit C3 = P2^5;
sbit C4 = P2^4;
//¶¨Òå¹²ÑôÊýÂë¹ÜÎÞСÊýµãµÄÊý×Ö¶ÎÂëÖµ
unsigned char SMGNoDot_CA[10] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
unsigned int count = 1523;
/*==================ÊýÂë¹Ü¶¯Ì¬ÏÔʾרÓÃÑÓʱº¯Êý==================*/
void DelaySMG(unsigned int t)
{
while(t--);
}
/*=====================µ¥¸öÊýÂë¹ÜÏÔʾº¯Êý=======================*/
void DisPlaySMG_Bit(unsigned char pos, unsigned char dat)
{
P0 = 0xff; //ÏûÒþ
switch(pos) //Ñ¡ÔñÊýÂë¹ÜλÖÃ
{
case 1:
C1 = 1; C2 = 0; C3 = 0; C4 = 0;
break;
case 2:
C1 = 0; C2 = 1; C3 = 0; C4 = 0;
break;
case 3:
C1 = 0; C2 = 0; C3 = 1; C4 = 0;
break;
case 4:
C1 = 0; C2 = 0; C3 = 0; C4 = 1;
break;
}
P0 = dat; //Êä³öÊýÂë¹ÜÏÔʾµÄÄÚÈÝ
}
/*====================4¸öÊýÂë¹Ü¶¯Ì¬ÏÔʾº¯Êý======================*/
void DisPlaySMG_4Bit(unsigned int dat)
{
DisPlaySMG_Bit(1, SMGNoDot_CA[dat / 1000]); //ǧλ
DelaySMG(100);
DisPlaySMG_Bit(2, SMGNoDot_CA[(dat % 1000) / 100]); //°Ùλ
DelaySMG(100);
DisPlaySMG_Bit(3, SMGNoDot_CA[(dat % 100) / 10]); //ʮλ
DelaySMG(100);
DisPlaySMG_Bit(4, SMGNoDot_CA[(dat % 10)]); //¸öλ
DelaySMG(100);
}
/*===================4¸öÊýÂë¹ÜÒÀ´ÎÏÔʾ0¡«9º¯Êý====================*/
void DisPlaySMG_zero_nine()
{
char i;
C1 = 1;
C2 = 1;
C3 = 1;
C4 = 1;
for(i = 0; i < 10; i++)
{
P0 = SMGNoDot_CA[i];
DelaySMG(40000);
}
}
/*=================´øÊýÂë¹ÜˢеÄÑÓʱº¯Êý======================*/
void Delay(unsigned int t)
{
while(t--)
{
DisPlaySMG_4Bit(count);
}
}
/*==========================Ö÷º¯Êý============================*/
void main()
{
DisPlaySMG_zero_nine();
while(1)
{
DisPlaySMG_4Bit(count);
Delay(100);
count++;
if(count == 1600)
{
count = 0;
}
}
}
程序（显示0）
#include
#define uchar unsigned char
uchar code SEG[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void main(void)
{
while(1)
{
P1=SEG[0];
}
}
程序（显示7）
#include
#define uchar unsigned char
uchar code SEG[1]={0x78};
void main(void)
{
while(1)
{
P1=SEG[0];
}
}
三 电路图
四 小结
本次学习学会了在数码管上显示数字，程序和电路图还是很简单的，程序里有一些小错误自己也检查出来了，数码管循环显示1000-3000还是有难度的。