数码管动态显示(定时器中断方式)+小数点+高位为0不显示
1 仿真现象
2 程序设计
2.1 主程序
#include <REG52.H> #include "DisplaySmg.h" #include "Timer0.h" unsigned int adc_result = 1234; void disp_num(void) //显示四位十进制数 { if(adc_result>=1000) //千位 { LedBuf[0]= adc_result/1000; } else { LedBuf[0]=23; //不显示 } if(adc_result>=100) //百位 { LedBuf[1]= adc_result/100%10; } else { LedBuf[1]=23; //不显示 } if(adc_result>=10) //十位 { LedBuf[2]= adc_result/10%10; } else { LedBuf[2]=23; //不显示 } LedBuf[3]= adc_result%10; //个位 } void main() { Timer0_Init(); //定时/计数器T0初始化 EA=1; //中断总开关 DotDig1=1; //点亮第二个数码管的小数点 while(1) { disp_num(); //显示数据 } } void Timer0_ISR(void) interrupt 1 { TR0=0; //关闭定时器 DisplaySmg(); //每过1ms,刷新一次数码管显示函数 TL0 = 0x66; //设置定时初始值,定时1ms TH0 = 0xFC; //设置定时初始值,定时1ms TR0=1; //打开定时器 }
2.2 数码管显示函数模块
#ifndef __DisplaySmg_H__ #define __DisplaySmg_H__ #include <REG52.H> #define GPIO_SEG P0 //段选端 #define GPIO_SEL P2 //位选端 extern unsigned char LedBuf[]; //外部变量声明 extern unsigned char DotDig0,DotDig1,DotDig2,DotDig3; void DisplaySmg(void); #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 DotDig0=0,DotDig1=0,DotDig2=0,DotDig3=0; //小数点控制位 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() //四位数码管,考虑小数点 { unsigned char i; //等价于 "static unsigned char i = 0;" unsigned char temp; switch(i) { case 0: { GPIO_SEG = 0x00; //消影 if(DotDig0==1) //小数点 { temp = LedData[LedBuf[0]] | 0x80; //点亮小数点 } else { temp = LedData[LedBuf[0]]; } GPIO_SEG = temp; //段码 GPIO_SEL = LedAddr[0]; //位选 i++; break; } case 1: GPIO_SEG = 0x00; if(DotDig1==1) //小数点 { temp = LedData[LedBuf[1]] | 0x80; } else { temp = LedData[LedBuf[1]]; } GPIO_SEG = temp; GPIO_SEL = LedAddr[1]; i++; break; case 2: GPIO_SEG = 0x00; if(DotDig2==1) //小数点 { temp = LedData[LedBuf[2]] | 0x80; } else { temp = LedData[LedBuf[2]]; } GPIO_SEG = temp; GPIO_SEL = LedAddr[2]; i++; break; case 3: GPIO_SEG = 0x00; if(DotDig3==1) //小数点 { temp = LedData[LedBuf[3]] | 0x80; } else { temp = LedData[LedBuf[3]]; } GPIO_SEG = temp; GPIO_SEL = LedAddr[3]; i=0; break; default:break; } }
2.3 定时计数器模块
#ifndef __Timer0_H__ #define __Timer0_H__ #include <reg52.h> void Timer0_Init(void); #endif
#include "Timer0.h" void Timer0_Init(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