基于51系列单片机等精度频率计及其protues仿真

#include <REGX52.H> #include "lcd.h" unsigned long Tsum; long double Psum,Fresult,Fage; unsigned char testcnt,i; double temp[3]; testinit() { TMOD=0X15; EX1=1; IT1=1; ET1=1; TR0=0; TR1=0; EA=1; } void int1() interrupt 2 { if(testcnt) { TR0=0; TR1=0; Tsum=(TH1<<8)|TH0; //过了一个循环后余下的时间 Tsum=Tsum+65536*testcnt; //时间总长 Psum=(double)(TH0<<8)+(double)TL0; //脉冲数的总和 Fresult=Psum/Tsum*1000000.00; //频率计算结果 temp[i++]=Fresult; //把结果放进数组里 Fresult=0; if(i>2) //有3个采样数值就进行取平均值计算 { for(i=0;i<3;i++) {Fresult=Fresult+temp[i];} Fage=Fresult/3.0; i=0; } } testcnt=0; TH1=0; TL1=0; TH0=0; TL0=0; TR1=1; TR0=1; EX1=0; } void t1() interrupt 3 //定时中断1 每65536个机器周期相应一次 { testcnt++; EX1=1; } main() { LCD_Initial(); GotoXY(0,0); Print("The frequecy is"); GotoXY(0,1); Print("000000.00HZ"); testinit(); while(1) { GotoXY(0,1); LCD_Write(LCD_DATA,(long)Fage/100000+0x30); GotoXY(1,1); LCD_Write(LCD_DATA,(long)Fage/10000%10+0x30); GotoXY(2,1); LCD_Write(LCD_DATA,(long)Fage/1000%10+0x30); GotoXY(3,1); LCD_Write(LCD_DATA,(long)Fage/100%10+0x30); GotoXY(4,1); LCD_Write(LCD_DATA,(long)Fage/10%10+0x30); GotoXY(5,1); LCD_Write(LCD_DATA,(long)Fage%10+0x30); GotoXY(7,1); LCD_Write(LCD_DATA,(long)(Fage*10)%10+0x30); GotoXY(8,1); LCD_Write(LCD_DATA,(long)(Fage*100)%10+0x30); } }