C语言数码管是共阴共阳程序 成功C DIY 单片机(2)51单片机直接驱动共阴极数码管...

C DIY ：completely Do It Yourself, 完全地自己动手做

(原创：守口如平)

单片机驱动Led数码管(或n个Led)应该算是单片机经典试验之一了。

数码管种类：

少量的数码管实际可以直接用单片机驱动(如4个数码管)。数码管数码管有两种：共阴极和共阳极数码管。虽然只是一个极性的不同，实际应用时大有不同(根据网上资料小结如下)：

数码管类型

上拉电阻

限流电阻

对单片机电流的影响

三极管驱动

工业IC

共阳极

不需

200~470Ω

(非排阻)

位码高电平，

段码低电平时点亮

PNP

共阴极

需要

(可排阻1KΩ)

(因而浪费电

而且而且全部

熄灭时比全部

点亮时更费电)

不需

位码低电平，

段码高电平时点亮

NPN

常用

现在手里只有共阴的数码管(LG5011AH)，按照网上搜索到的下图实现：

实际用的单片机是AT89S51，参考上面的的图做了适当的修改，用P2控制段，P3控制位。

所有与单片机的连接均用排针。

参考下图即可方便的在51和2051之间轻松转换：

完成的板子如下。与上次比有几处改进：采用USB供电，供电电路加500mA过流保护自恢复保险(USB口旁黄色像瓷片电容)，单片机的P0~P3全部用排针引出。当然加了LED数码管、排阻。

LED驱动的段显控制：

首先确定显示的段，将段按顺序转换成二进制数字，进而转换成十进制数字。

假设P2.0~P2.6按顺序接到a-h段

单片机

Pn.7

Pn.6

Pn.5

Pn.4

Pn.3

Pn.2

Pn.1

Pn.0

数码管

h

g

f

e

d

c

b

a

如显示“H”

0

1

1

1

0

1

1

0

B01110110= 0x76

如显示“O”

0

0

1

1

1

1

1

1

B00111111= 0x3f

程序(C语言)

//这是采用查询方式的，比较占CUP资源,

# include

typedef unsigned char uchar;

//这里定义了所有二进制--十六进制转换

#define B00000000 0x0

#define B00000001 0x1

#define B00000010 0x2

#define B00000011 0x3

#define B00000100 0x4

#define B00000101 0x5

#define B00000110 0x6

#define B00000111 0x7

#define B00001000 0x8

#define B00001001 0x9

#define B00001010 0xa

#define B00001011 0xB

#define B00001100 0xc

#define B00001101 0xd

#define B00001110 0xe

#define B00001111 0xf

#define B00010000 0x10

#define B00010001 0x11

#define B00010010 0x12

#define B00010011 0x13

#define B00010100 0x14

#define B00010101 0x15

#define B00010110 0x16

#define B00010111 0x17

#define B00011000 0x18

#define B00011001 0x19

#define B00011010 0x1a

#define B00011011 0x1B

#define B00011100 0x1c

#define B00011101 0x1d

#define B00011110 0x1e

#define B00011111 0x1f

#define B00100000 0x20

#define B00100001 0x21

#define B00100010 0x22

#define B00100011 0x23

#define B00100100 0x24

#define B00100101 0x25

#define B00100110 0x26

#define B00100111 0x27

#define B00101000 0x28

#define B00101001 0x29

#define B00101010 0x2a

#define B00101011 0x2B

#define B00101100 0x2c

#define B00101101 0x2d

#define B00101110 0x2e

#define B00101111 0x2f

#define B00110000 0x30

#define B00110001 0x31

#define B00110010 0x32

#define B00110011 0x33

#define B00110100 0x34

#define B00110101 0x35

#define B00110110 0x36

#define B00110111 0x37

#define B00111000 0x38

#define B00111001 0x39

#define B00111010 0x3a

#define B00111011 0x3B

#define B00111100 0x3c

#define B00111101 0x3d

#define B00111110 0x3e

#define B00111111 0x3f

#define B01000000 0x40

#define B01000001 0x41

#define B01000010 0x42

#define B01000011 0x43

#define B01000100 0x44

#define B01000101 0x45

#define B01000110 0x46

#define B01000111 0x47

#define B01001000 0x48

#define B01001001 0x49

#define B01001010 0x4a

#define B01001011 0x4B

#define B01001100 0x4c

#define B01001101 0x4d

#define B01001110 0x4e

#define B01001111 0x4f

#define B01010000 0x50

#define B01010001 0x51

#define B01010010 0x52

#define B01010011 0x53

#define B01010100 0x54

#define B01010101 0x55

#define B01010110 0x56

#define B01010111 0x57

#define B01011000 0x58

#define B01011001 0x59

#define B01011010 0x5a

#define B01011011 0x5B

#define B01011100 0x5c

#define B01011101 0x5d

#define B01011110 0x5e

#define B01011111 0x5f

#define B01100000 0x60

#define B01100001 0x61

#define B01100010 0x62

#define B01100011 0x63

#define B01100100 0x64

#define B01100101 0x65

#define B01100110 0x66

#define B01100111 0x67

#define B01101000 0x68

#define B01101001 0x69

#define B01101010 0x6a

#define B01101011 0x6B

#define B01101100 0x6c

#define B01101101 0x6d

#define B01101110 0x6e

#define B01101111 0x6f

#define B01110000 0x70

#define B01110001 0x71

#define B01110010 0x72

#define B01110011 0x73

#define B01110100 0x74

#define B01110101 0x75

#define B01110110 0x76

#define B01110111 0x77

#define B01111000 0x78

#define B01111001 0x79

#define B01111010 0x7a

#define B01111011 0x7B

#define B01111100 0x7c

#define B01111101 0x7d

#define B01111110 0x7e

#define B01111111 0x7f

#define B10000000 0x80

#define B10000001 0x81

#define B10000010 0x82

#define B10000011 0x83

#define B10000100 0x84

#define B10000101 0x85

#define B10000110 0x86

#define B10000111 0x87

#define B10001000 0x88

#define B10001001 0x89

#define B10001010 0x8a

#define B10001011 0x8B

#define B10001100 0x8c

#define B10001101 0x8d

#define B10001110 0x8e

#define B10001111 0x8f

#define B10010000 0x90

#define B10010001 0x91

#define B10010010 0x92

#define B10010011 0x93

#define B10010100 0x94

#define B10010101 0x95

#define B10010110 0x96

#define B10010111 0x97

#define B10011000 0x98

#define B10011001 0x99

#define B10011010 0x9a

#define B10011011 0x9B

#define B10011100 0x9c

#define B10011101 0x9d

#define B10011110 0x9e

#define B10011111 0x9f

#define B10100000 0xa0

#define B10100001 0xa1

#define B10100010 0xa2

#define B10100011 0xa3

#define B10100100 0xa4

#define B10100101 0xa5

#define B10100110 0xa6

#define B10100111 0xa7

#define B10101000 0xa8

#define B10101001 0xa9

#define B10101010 0xaa

#define B10101011 0xaB

#define B10101100 0xac

#define B10101101 0xad

#define B10101110 0xae

#define B10101111 0xaf

#define B10110000 0xB0

#define B10110001 0xB1

#define B10110010 0xB2

#define B10110011 0xB3

#define B10110100 0xB4

#define B10110101 0xB5

#define B10110110 0xB6

#define B10110111 0xB7

#define B10111000 0xB8

#define B10111001 0xB9

#define B10111010 0xBa

#define B10111011 0xBb

#define B10111100 0xBc

#define B10111101 0xBd

#define B10111110 0xBe

#define B10111111 0xBf

#define B11000000 0xc0

#define B11000001 0xc1

#define B11000010 0xc2

#define B11000011 0xc3

#define B11000100 0xc4

#define B11000101 0xc5

#define B11000110 0xc6

#define B11000111 0xc7

#define B11001000 0xc8

#define B11001001 0xc9

#define B11001010 0xca

#define B11001011 0xcB

#define B11001100 0xcc

#define B11001101 0xcd

#define B11001110 0xce

#define B11001111 0xcf

#define B11010000 0xd0

#define B11010001 0xd1

#define B11010010 0xd2

#define B11010011 0xd3

#define B11010100 0xd4

#define B11010101 0xd5

#define B11010110 0xd6

#define B11010111 0xd7

#define B11011000 0xd8

#define B11011001 0xd9

#define B11011010 0xda

#define B11011011 0xdB

#define B11011100 0xdc

#define B11011101 0xdd

#define B11011110 0xde

#define B11011111 0xdf

#define B11100000 0xe0

#define B11100001 0xe1

#define B11100010 0xe2

#define B11100011 0xe3

#define B11100100 0xe4

#define B11100101 0xe5

#define B11100110 0xe6

#define B11100111 0xe7

#define B11101000 0xe8

#define B11101001 0xe9

#define B11101010 0xea

#define B11101011 0xeB

#define B11101100 0xec

#define B11101101 0xed

#define B11101110 0xee

#define B11101111 0xef

#define B11110000 0xf0

#define B11110001 0xf1

#define B11110010 0xf2

#define B11110011 0xf3

#define B11110100 0xf4

#define B11110101 0xf5

#define B11110110 0xf6

#define B11110111 0xf7

#define B11111000 0xf8

#define B11111001 0xf9

#define B11111010 0xfa

#define B11111011 0xfB

#define B11111100 0xfc

#define B11111101 0xfd

#define B11111110 0xfe

#define B11111111 0xff

uchar code

helloB[]={B01110110,B01111001,B00111000,B00111111};//HELLO

const unsigned char LED7Code[]={

0x3F,//

0

0x06,//

1

0x5B,//

2

0x4F,//

3

0x66,//

4

0x6D,//

5

0x7D,//

6

0x07,//

7

0x7F,//

8

0x6F,//

9

0x77,//

A

0x7C,//

B

0x39,//

C

0x5E,//

D

0x79,//

E

0x71//

F

};

void delay(int n);

void display0_F();

void displayHELLO();

//

void main(void)

{

P2=0xff;

//先将段码关闭

P3=0xff;

//将位码关闭

delay(20);//等待一会

while(1)

{

displayHELLO();

display0_F();

}

}

void delay(int

n)//0.01*n 秒

{

int j;

uchar

k;

for(j=0;j

{

for(k=255;k>0;k--);

}

}

void

display0_F()//显示全8和0~F

{

uchar i,j,m;

for (m=100;m>0;m--) {

for(i=0;i<=3;i++)

{

P2=0x00;

P3=~(0x01<

P2=0xff;//输出段码到P2口

delay(5);

}

}

for(j=0;j<16;j++){

for

(m=30;m>0;m--)//显示30次约0.3秒

{

for(i=0;i<=3;i++)

{

P2=0x00;

P3=~(0x01<

if((i+j)<16)

P2=LED7Code[i+j];//输出段码到P2口

else

P2=0;

delay(5);

}

}

P2=0xff;//关闭段码

P3=0xff;//关闭位码

delay(5);

//等待0.3秒

}

}

void

displayHELLO()//显示HELO

{

uchar i,m;

for

(m=200;m>0;m--) {

for(i=0;i<=3;i++)

{

P2=0x00;

P3=~(0x01<

P2=helloB[i];

//输出段码到P2口

delay(5);

}

}

}