基于51单片机的数字频率计程序仿真图及代码

#include <reg52.h> #define Segment P0 #define sl P2 sbit clear=P1^3; sbit fp2=P1^2; //定义数据端口地址，0时分频处理，1时不分频 unsigned char count; //定时 1s 计数 unsigned char d[4]; //对应数码管的各位 unsigned char dangwei; //档位 unsigned int timeN; //不同档位计时值 unsigned int fCount; //脉冲下降沿次数 unsigned int regCount; //脉冲次数暂存 unsigned int pCount; //频率显示 unsigned char Num[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; //七段数码管代码共阳极 void Delay(unsigned int DelayTime) { while(DelayTime--); } void dispbuf() { { if(dangwei==0) //档位 { d[3]=0; d[2]=(pCount/100)%10; d[1]=(pCount/10)%10; d[0]=pCount%10; sl=0x01;Delay(1);Segment=Num[d[3]];Delay(200); sl=0x02;Delay(1);Segment=Num[d[2]];Delay(200); sl=0x04;Delay(1);Segment=Num[d[1]];Delay(200); sl=0x08;Delay(1);Segment=Num[d[0]];Delay(200); } else if(dangwei==1) { d[3]=pCount/1000; d[2]=(pCount/100)%10; d[1]=(pCount/10)%10; d[0]=pCount%1; sl=0x01;Delay(1);Segment=Num[d[3]];Delay(200); sl=0x02;Delay(1);Segment=Num[d[2]];Delay(200); sl=0x04;Delay(1);Segment=Num[d[1]]&0x7f;Delay(200); //带小数点 sl=0x08;Delay(1);Segment=Num[d[0]];Delay(200); } else { d[3]=0; d[2]=0; d[1]=0; d[0]=0; } } } void intial() { clear=1; //分频器初始化 fp2=1; timeN=20; //档位初始化为 Hz 档 dangwei=0; TMOD=0x61; //定时器0，工作方式1，计数器1，工作方式1 TH0= (65536-50000)/256; TL0= (65536-50000)%256; //计数器1计数初值 TH1=0xff; // 256-1; TL1=0xff; // 256-1; TR0=1; //开定时器0中断 ET0=1; //定时器0允许 TR1=1; //开计数器1中断 ET1=1; //允许计数器1中断 EA=1; //总中断允许 } void main() { intial(); while(1) { dispbuf(); } } void timer0() interrupt 1 { count++; if(count==timeN) { ET1=0; //计时1s，暂停外部计数1 TR1=0; count=0; regCount=fCount; //更新显示 fCount=0; //频率计数清零 clear=0; //硬件分频器清零 clear=1; } if(dangwei==0) //档位切换 { pCount=regCount; if(regCount>999) { pCount=0; //显示清零 dangwei=1; timeN=1; //定时 50ms fp2=0; //硬件分频处理 TH1=0xfb; //50分频 256-5 TL1=0xfb; //256-5 pCount=regCount*10; //换算成相应的显示：f=regCount*100 } } else if(dangwei==1) { if(regCount<1) { dangwei=0; timeN=20; //定时 1s fp2=1; //不分频 TH1=0xff; //256-1 TL1=0xff; //256-1 } else if(regCount<1000) //KHz 档 { dangwei=1; timeN=1; //定时 50ms fp2=0; //硬件分频处理 TH1=0xfb; //50分频 256-5 TL1=0xfb; //256-5 pCount=regCount*10; //换算成相应的显示：f=regCount*100 } else { dangwei=3; //超出范围 } } ET1=1; //恢复外部计数 1 TR1=1; TH0=(65536-50000)/256; TL0=(65536-50000)%256; } void enterFre() interrupt 3 //外部频率输入 { fCount++; }