数码管动态显示+定时器中断方式+Protues

1 仿真现象

2 程序设计

2.1 主程序

#include "DisplaySmg.h"
#include "Timer0.h"

sbit LED = P1^0;

unsigned int     SystemTimer=0;    //系统时间
unsigned char     SystemFlag=1;    //初始状态
unsigned int     NUM = 1983;        //待显示数据

void disp_num();

void main()
{
    Timer0Init();                //启动定时器T0
    do                            //开机显示
    {
        if(SystemTimer%500 == 0)    //每间隔50ms
            LED = ~LED;                //LED灯闪烁
    }while(SystemTimer<5000);   //开机显示5000ms
    SystemFlag = 0;                //关闭初始状态,进入工作状态
    while(1)
    {    
        disp_num();                //显示四位十进制数
    }
}

void disp_num()
{
    LedBuf[0]= NUM/1000;        //取千位
    LedBuf[1]= NUM/100%10;        //取百位
    LedBuf[2]= NUM/10%10;        //取十位
    LedBuf[3]= NUM%10;            //取个位
}

//定时计数器T0每满1ms,执行该中断函数,
void Timer0_ISR(void) interrupt 1 
{
    TR0=0;
    if(SystemFlag==1) SystemTimer++; //系统时间自加1
    DisplaySmg();        //实现数码管的动态显示刷新
    TL0 = 0x66;            //设置定时初始值
    TH0 = 0xFC;            //设置定时初始值
    TR0=1;
}

2.2 数码管显示函数模块(switch case语言实现)

#ifndef __DisplaySmg_H__
#define __DisplaySmg_H__

#include <REG52.H>

#define GPIO_SEG P0        //段选端
#define GPIO_SEL P2        //位选端
#define SMG_NUM  4        //数码管的个数

extern unsigned char LedBuf[];    //外部变量声明

void DisplaySmg();

#endif
#include "DisplaySmg.h"

unsigned char code LedData[]={    //共阴型数码管的段码表,字符,序号
                0x3F,  //"0",0
                0x06,  //"1",1
                0x5B,  //"2",2
                0x4F,  //"3",3
                0x66,  //"4",4
                0x6D,  //"5",5
                0x7D,  //"6",6
                0x07,  //"7",7
                0x7F,  //"8",8
                0x6F,  //"9",9
                0x77,  //"A",10
                0x7C,  //"B",11
                0x39,  //"C",12
                0x5E,  //"D",13
                0x79,  //"E",14
                0x71,  //"F",15
                0x76,  //"H",16
                0x38,  //"L",17
                0x37,  //"n",18
                0x3E,  //"u",19
                0x73,  //"P",20
                0x5C,  //"o",21
                0x40,  //"-",22
                0x00,  //熄灭 23
                         };

unsigned char code LedAddr[]={0xfe,0xfd,0xfb,0xf7};    //数码管位选

unsigned char LedBuf[]={22,22,22,22};    //显示缓存区

void DisplaySmg()
{
    unsigned char i;                 //等价于 "static unsigned char i = 0;"
    switch(i)
    {
        case 0:
            GPIO_SEG = 0x00;                //消影
            GPIO_SEG = LedData[LedBuf[0]];    //段码
            GPIO_SEL = LedAddr[0];            //位选
            i++;
            break;
        case 1:
            GPIO_SEG = 0x00;
            GPIO_SEG = LedData[LedBuf[1]];
            GPIO_SEL = LedAddr[1];
            i++;
            break;
        case 2:
            GPIO_SEG = 0x00;
            GPIO_SEG = LedData[LedBuf[2]];
            GPIO_SEL = LedAddr[2];
            i++;
            break;
        case 3:
            GPIO_SEG = 0x00;
            GPIO_SEG = LedData[LedBuf[3]];
            GPIO_SEL = LedAddr[3];
            i=0;
            break;
        default:break;
    }
}

3.3 定时/计数器中模块

#ifndef __Timer0_H__
#define __Timer0_H__

#include <reg52.h>

void Timer0Init(void);

#endif
#include "Timer0.h"

void Timer0Init(void)        //1毫秒@11.0592MHz
{
    TMOD &= 0xF0;        //设置定时器模式
    TMOD |= 0x01;        //设置定时器模式
    TL0 = 0x66;            //设置定时初始值
    TH0 = 0xFC;            //设置定时初始值
    TF0 = 0;            //清除TF0标志
    TR0 = 1;            //定时器0开始计时
    
    ET0 = 1;            //定时器0中断开关
    EA  = 1;            //中断总开关
}


//中断服务函数一定是一个没有返回值的函数
//中断服务函数一定是没有参数的函数
//中断服务函数函数名后跟着关键字interrupt
//interrupt n 0~4 5个中断源,8*n+0003H
// 0003H INT0, 00BH T0, 0013H INT1, 001BH T1, 0023H ES
//中断服务函数不能被主程序或者其他程序所调用
//n后面跟着using m(0~3)工作寄存器组

//void Timer0_ISR(void) interrupt 1 
//{
//    TL0 = 0x66;            //设置定时初始值
//    TH0 = 0xFC;            //设置定时初始值
//}

3 参考来源

(1)单片机应用实践篇之定时计/数器中断方式实现数码管动态显示刷新_哔哩哔哩_bilibili

posted @ 2023-01-31 21:51  豌豆茶  阅读(298)  评论(0编辑  收藏  举报