1-1MHz频率计仿真图

#include<reg52.h> #include <intrins.h> #include <math.h> #include <stdio.h> #define uchar unsigned char #define uint unsigned int uchar code table[]=" gong hao "; uchar num; sbit lcdrs=P3^0; sbit lcdrw=P3^6; sbit lcden=P3^7; sbit p32=P3^2; long int counter; long float f; void delay(uint z) { uint x,y; for(x=z;x>0;x--) for(y=110;y>0;y--); } void write_com(uchar com) { lcdrs=0; P0=com; delay(5); lcden=1; delay(5); lcden=0; } void write_data(uchar date) { lcdrs=1; P0=date; delay(5); lcden=1; delay(5); lcden=0; } void init() { lcdrs=0; lcden=0; lcdrw=0; write_com(0x01); write_com(0x3f); write_com(0x0c); } void main() {uchar i,n; uchar buff[16]; init(); write_com(0x80); for(num=0;num<=15;num++) { write_data(table[num]); delay(20); } P2=0x00; while(1) { TMOD=0X09; TH0=0; TL0=0; while(p32==1); TR0=1; while(p32==0); while(p32==1); TR0=0; counter=TH0*256+TL0; while(counter<=500) //判断是否分频及计算分频次数 { P2++; i++; counter=counter*10; if(i==4) {P2=0x00; break; } } f=(1000000.0/(2*counter))*pow(10,i); if(f<1000) {sprintf(buff,"%5.2fHZ",f);} else if(f<1000000) { f=f/1000; sprintf(buff,"%5.2fkHZ",f);} write_com(0xc0); for(n=0;n<16&&buff[n]!='\0';n++) { write_data(buff[n]); } } }