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