数码管: 基于STC89C52的数码管设计详解

一. 硬件设计详解

说明:

选通一个 分两步,

第一步是位选,即选择哪个数码管亮, 这里位选是通过锁存器U2的WE1~WE6来选择第一个数码管到第六个数码管,由于数码管为共阴极(相对于8位数码管),那么这里WE端为0代表位选选通,

第二步是段选,即选择数码管的哪位亮, 这里段选是通过锁存器U1的a~h来选择数码管的8位管子,这里DUAN端为1代表段选选通.

二. 程序设计详解

1. 让第一个数码管显示8

#include <reg52.h>

sbit duan = P2 ^ 6;

sbit wela = P2 ^ 7;

void main()

{

wela = 1;

P0 = 0xfe;

wela = 0;

duan = 1;

P0 = 0x7f;

duan = 0;

while (1);

}

2. 让6个数码管显示反复显示0~F

#include <reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit duan = P2 ^ 6;

sbit wela = P2 ^ 7;

uchar code table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void delayms(uint xms);

void main()

{

uchar num;

wela = 1;

P0 = 0xc0;

wela = 0;

while (1)

{

for (num = 0; num < 16; num++)

{

duan = 1;

P0 = table[num];

duan = 0;

delayms(500);

}

}

}

void delayms(uint xms)

{

uint i, j;

for (i = xms; i > 0; i--)

for (j = 110; j > 0; j--)

;

}

3.

第一个数码管显示1,时间为0.5s,然后关闭它,

第二个数码管显示2,时间为0.5s,然后关闭它,

…

第六个数码管显示6,时间为0.5s,然后关闭它,

依次循环.

#include <reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit duan = P2 ^ 6;

sbit wela = P2 ^ 7;

uchar code we_table[] = {

0xfe,0xfd,0xfb,0xf7,0xef,0xdf

};

uchar code du_table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void delayms(uint xms);

void main()

{

uchar num;

while (1)

{

for (num = 0; num < 6; num++)

{

wela = 1;

P0 = we_table[num];

wela = 0;

P0 = 0xff;

duan = 1;

P0 = du_table[num+1];

duan = 0;

delayms(1);

}

}

}

void delayms(uint xms)

{

uint i, j;

for (i = xms; i > 0; i--)

for (j = 110; j > 0; j--)

;

}

说明:

只要将延时时间调整为1s,我们可以看到数码管一起显示123456.

P0 = 0xff; 是用来消影, 即消除段选与位选之间的影响.

4.

定时器0的方式1实现第一个发光二极管以200ms间隔闪烁,

定时器1的方式1实现数码管前两位59s循环计时

#include <reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit dula = P2 ^ 6;

sbit wela = P2 ^ 7;

sbit 1 = P1 ^ 0;

uchar code table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void delayms(uint);

void display(uint);

uchar num, num1, num2;

void main()

{

TMOD = 0x11;

TH0 = (65536 - 45872) / 256;

TL0 = (65536 - 45872) % 256;

TH1 = (65536 - 45872) / 256;

TL1 = (65536 - 45872) % 256;

EA = 1;

ET0 = 1;

ET1 = 1;

TR0 = 1;

TR1 = 1;

while (1)

{

display(num);

}

}

void display(uint num)

{

dula = 1;

P0 = table[num / 10];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfe;

wela = 0;

delayms(5);

dula = 1;

P0 = table[num % 10];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfd;

wela = 0;

delayms(5);

}

void delayms(uint xms)

{

uint i, j;

for (i = xms; i > 0; i--)

for (j = 110; j > 0; j--)

;

}

void T0_time() interrupt 1

{

TH0 = (65536 - 45872) / 256;

TL0 = (65536 - 45872) % 256;

num1++;

if (num1 == 4)

{

num1 = 0;

led1 = ~led1;

}

}

void T1_time() interrupt 3

{

TH1 = (65536 - 45872) / 256;

TL1 = (65536 - 45872) % 256;

num2++;

if (num2 == 20)

{

num2 = 0;

num++;

if (num == 60)

num = 0;

}

}

5. 用定时器以间隔500MS在6位数码管上依次显示0、1、2、3….C、D、E、F，重复

#include <reg52.h>

#include <intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit dula = P2 ^ 6;

sbit wela = P2 ^ 7;

uchar num, tt;

uchar code table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void main()

{

num = 0;

tt = 0;

TMOD = 0x01;

TH0 = (65536 - 45872) / 256;

TL0 = (65536 - 45872) % 256;

EA = 1;

ET0 = 1;

TR0 = 1;

dula = 1;

P0 = 0x3f;

dula = 0;

wela = 1;

P0 = 0xc0;

wela = 0;

while (1)

{

if (tt == 10)

{

tt = 0;

num++;

if (num == 16)

num = 0;

dula = 1;

P0 = table[num];

dula = 0;

}

}

}

void T0_timer() interrupt 1

{

TH0 = (65536 - 45872) / 256;

TL0 = (65536 - 45872) % 256;

tt++;

}

6. 利用动态扫描方法在六位数码管上显示出稳定的654321

#include <reg52.h>

#include <intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit dula = P2 ^ 6;

sbit wela = P2 ^ 7;

uchar code du_table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

uchar code we_table[] = {

0xfe,0xfd,0xfb,0xf7,0xef,0xdf

};

void delayms(uint);

void main()

{

uchar num;

for (num = 6; num > 0; num--)

{

dula = 1;

P0 = du_table[num];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = we_table[6 - num];

wela = 0;

delayms(1);

}

}

void delayms(uint xms)

{

uint i, j;

for (i = xms; i > 0; i--)

for (j = 110; j > 0; j--)

;

}

7. 用动态扫描方法和定时器1在数码管的前三位显示出秒表，精确到1%秒，即后两位显示1%秒，一直循环下去

#include <reg52.h>

#include <intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit dula = P2 ^ 6;

sbit wela = P2 ^ 7;

uint tt;

uchar code du_table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71

};

void display(uint);

void delayms(uint);

void main()

{

TMOD = 0x10;

TH1 = (65536 - 10000) / 256;

TL1 = (65536 - 10000) % 256;

EA = 1;

ET1 = 1;

TR1 = 1;

while (1)

{

display(tt);

}

}

void T1_timer() interrupt 3

{

TH1 = (65536 - 10000) / 256;

TL1 = (65536 - 10000) % 256;

tt++;

if (tt == 1000)

tt = 0;

}

void display(uint num)

{

dula = 1;

P0 = du_table[num / 100];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfe;

wela = 0;

delayms(1);

dula = 1;

P0 = du_table[num % 100 / 10];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfd;

wela = 0;

delayms(1);

dula = 1;

P0 = du_table[num % 100 % 10];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfb;

wela = 0;

delayms(1);

}

void delayms(uint xms)

{

uint i, j;

for (i = xms; i > 0; i--)

for (j = 110; j > 0; j--)

;

}

8. 利用动态扫描和定时器1在数码管上显示出从765432开始以1/10秒的速度往下递减直至765398并保持显示此数，与此同时利用定时器0以500MS速度进行流水灯从上至下移动，当数码管上数减到停止时，实验板上流水灯也停止然后全部开始闪烁，3秒后（用T0定时）流水灯全部关闭、数码管上显示出“HELLO”。到此保持住

#include <reg52.h>

#include <intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit dula = P2 ^ 6;

sbit wela = P2 ^ 7;

uchar code table[] = {

0x3f,0x06,0x5b,0x4f,

0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,

0x39,0x5e,0x79,0x71,

0x76,0x79,0x38,0x3f,0

};

uchar temp, t0, t1, bai, shi, ge, flag, flag1;

uint shu;

void init();

void display(uchar, uchar, uchar, uchar, uchar, uchar);

void delayms(uint);

void main()

{

init();

while (1)

{

if (flag1 != 1)

display(7,6,5,bai,shi,ge);

else

display(16,17,18,18,19,20);

}

}

void init()

{

shu = 432;

temp = 0xfe;

P1 = temp;

TMOD = 0x11;

TH0 = (65536 - 50000) / 256;

TL0 = (65536 - 50000) % 256;

TH1 = (65536 - 50000) / 256;

TL1 = (65536 - 50000) % 256;

EA = 1;

ET0 = 1;

ET1 = 1;

TR0 = 1;

TR1 = 1;

}

void T0_timer() interrupt 1

{

TH0 = (65536 - 50000) / 256;

TL0 = (65536 - 50000) % 256;

t0++;

if (flag != 1)

{

if (t0 == 10)

{

t0 = 1;

temp = _crol_(temp,1);

P1 = temp;

}

}

else

{

if (t0 % 4 == 0)

{

P1 = ~P1;

}

if (t0 == 60)

{

TR0 = 0;

P1 = 0xff;

flag1 = 1;

}

}

}

void T1_timer() interrupt 3

{

TH1 = (65536 - 50000) / 256;

TL1 = (65536 - 50000) % 256;

t1++;

if (t1 == 2)

{

t1 = 0;

shu--;

bai = shu / 100;

shi = shu % 100 / 10;

ge = shu % 10;

if (shu == 398)

{

TR0 = 0;

TH0 = (65536 - 50000) / 256;

TL0 = (65536 - 50000) % 256;

TR0 = 1;

flag = 1;

t0 = 0;

P1 = 0xff;

TR1 = 0;

}

}

}

void display(uchar aa, uchar bb, uchar cc, uchar bai, uchar shi, uchar ge)

{

dula = 1;

P0 = table[aa];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfe;

wela = 0;

delayms(1);

dula = 1;

P0 = table[bb];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfd;

wela = 0;

delayms(1);

dula = 1;

P0 = table[cc];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xfb;

wela = 0;

delayms(1);

dula = 1;

P0 = table[bai];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xf7;

wela = 0;

delayms(1);

dula = 1;

P0 = table[shi];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xef;

wela = 0;

delayms(1);

dula = 1;

P0 = table[ge];

dula = 0;

P0 = 0xff;

wela = 1;

P0 = 0xdf;

wela = 0;

delayms(1);

}

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