measure_frequency.c

基于51的单片机设计的电容计的完整源代码

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measure_frequency.c文件 频率测量 

Created by Computer-lov
Date: 2004.11.13

Edit date:2006.3.2

Version V1.1
Copyright(C) Computer-lov 2004-2014
All rigths reserved      
*******************************************************************/


#include "hardware.h"
#include "measure_frequency.h"
#include "main.h"
#include "LCD1602.h"
#include "isr.h"

unsigned char frequency_measure_time;
unsigned char frequency_measure_end;

unsigned char code FREQUENCY_TEXT[]={"FREQUENCY:"};

void Measure_frequency_and_display(void)
{
 unsigned char i;
 CLEAR_HC393=1;
 TVH0=0;
 TH0=0;
 TL0=0;
 CLEAR_HC393=0;
 TR0=1;
 frequency_measure_time=100;
 frequency_measure_end=1;
 while(frequency_measure_end);
 TR0=0;
 ((unsigned char *)&result)[0]=TVH0;
 ((unsigned char *)&result)[1]=TH0;
 ((unsigned char *)&result)[2]=TL0;
 ((unsigned char *)&result)[3]=HC393_DATA;
 buffer[0]=' ';
 buffer[1]=' ';
 for(i=10;i>1;i--)
  {
   buffer[i]=(result%10)+'0';
   result/=10;   
  }
 buffer[11]='H';
 buffer[12]='z';
 buffer[13]=' ';
 buffer[14]=' ';
 buffer[15]=' ';
 buffer[16]=0x00;
 LCD_cls();
 LCD_prints(FREQUENCY_TEXT);
 LCD_set_position(40);
 LCD_prints(buffer);
}

void Measure_frequency(void)
{
 LCD_cls();
 LCD_prints(FREQUENCY_TEXT);
 LCD_set_position(40);
 LCD_prints("  000000000Hz   ");
 TMOD=0x15;
 while(status==MEASURE_FREQUENCY)
  {
   if(key)
    {
     if(key==KEY_MENU){TR0=0;FREQUENCY_IN_ENABLE=0;status=MAIN_MENU;Write_a_EEPROM_data(EEPROM_Addr,0x01,status);key=0;break;}
     key=0;
    }
   Measure_frequency_and_display();
  }
}