51简单频率计设计程序

ID:208888 · 发表于 2017-6-8 21:57

程序：
（1）主程序：
#include <reg52.h>
#include <intrins.h>
#include "setVar.h"
#include "setvar.c"
#include "LCD1602.h"
#include "MeasureFrequency.h"
#define DATA_MODE_4
void main()
{//初始化各种参数
lcd_init();
while(1)
  { measure_freq(); }
}
（2）频率测量控制程序：
#include "MeasureFrequency.h"
#include "reg52.h"
#include "setvar.h"
#include "lcd1602.h"
long  freqCount1=0;//频率计数
long  freqCount0=0,temp_frecount=0;
uchar TimerCount0=0;
uchar TimerCount1=0;
float fr_float=0;
uchar tempTL1,tempTH1;
uchar level=2;//默认采用高频测量
uchar timer_count_full=20;//1000ms:89C52+12MHz=20次
ulong freq=0;  //测量得到脉冲数目
uchar OK,OK1,num;
uchar start=0;
//测量高频
//T0定时1000ms，每次50ms/12，20*12次。T1计数，每次溢出65536
void measure_freq()
{ ////配置定时器////
TMOD=0x11;
TH0=0x3c;TL0=0xb0; 65536-50000=15536=3cb0
freqCount0=0;
level=1;
IT0 = 1;  //外部中断0采用边沿触发方式;边沿触发为1下降沿有效
EX0 = 1;  //开外部中断0
TR1=0;
EX1 = 0;  //关闭定时器1和外部中断1
TR0=1;
EA=1;
OK=0;  level=2;
while(!OK);
if(level==1)
{ TR0=0;
  EX0=0;  //关闭定时器0和外部中断0
  ET1=1;//启用定时器1中断
  TR1=0;//关闭定时器1
  IT1=1;  //外部中断0采用电平触发方式;边沿触发为1下降沿有效
  EX1=1;  //开外部中断0
  EA=1;
OK1=0;
}
}
void int0() interrupt 0
{ freqCount0++;  }
void T0_int() interrupt 1
{ TH0=0x3c;TL0=0xb0;// 65536-50000=15536=3cb0
TimerCount0++;
if(level==2)
{ if(TimerCount0==20)//高频模式
  { EX0 = 0;  //关外部中断0    temp_frecount=freqCount0;
EA=0; TR0=0;//关闭
TimerCount0=0;
if(temp_frecount>1000)//1K是高频，低频的分界线
{ level=2;
lcd_write_long(3,1,(temp_frecount)*0.9993);//若频率不准，只许修改系数
}
else level=1;//低频
freqCount0=0;
temp_frecount=0;
OK=1; //标志显示完成
  }
}
}
void int1() interrupt 2
{  freqCount1++;
if(num==1) //脉冲第一次进入
{ TH1=TL1=0;
TimerCount1=0;
  TR1=1;//启用定时器
  num=2;
  freqCount1=0;
  }
if(freqCount1==5)
{ EX1 = 0;  //关外部中断1
TR1=0;//关闭定时器1
tempTH1=TH1;
  tempTL1=TL1;       fr_float=1000000.0/(TimerCount1*65536+tempTH1*256+tempTL1)*5*0.3334;
   //若低频频率不准只需改系数1.0000
   lcd_write_float(3,1,fr_float);
   OK1=1;  }
}
void T1_int() interrupt 3
{ TH1=TL1=0;
TimerCount1++; }

#include "LCD1602.h"
//启动之前，首先延时一段时间
sbit lcd_port_rs=LCD_PORT_RS;
sbit lcd_port_e=LCD_PORT_E;
//LCD延时，等待命令执行完
void lcd_delay(char j)
{ int i=0;
while(j--)
for(i=0;i<300;i++);//i<50 }
//写入命令，下降沿写入
void lcd_en()
{ lcd_port_e=1;
lcd_delay(1);
lcd_port_e=0; }
#ifdef LCD_DATA_8_LINE
void lcd_write(char rs_mode,uchar value)
{ lcd_port_rs=rs_mode;
  LCD_PORT_DATA=value;
  lcd_en();
  lcd_delay(10);
}
#endif
#ifdef LCD_DATA_4_LINE
void lcd_write(char rs_mode,uchar value)
{ lcd_port_rs=rs_mode;
//首先发送高4位
LCD_PORT_DATA&=0x0f;
LCD_PORT_DATA|=value&0xf0;//低4位不变，高4为赋值value的高4位
lcd_en();
lcd_delay(1);
  LCD_PORT_DATA&=0x0f;
  LCD_PORT_DATA|=value<<4;  lcd_en();
  lcd_delay(1); }
#endif
Void lcd_write_char(uchar x_pos,uchar y_pos,char value)
{ //写入地址
x_pos&=0x0f;//
y_pos&=0x01;//
if(y_pos) x_pos+=0x40;
x_pos+=0x80;//
lcd_write(0,x_pos);
lcd_delay(10);
lcd_write(1,value);  }
void lcd_init()
{ lcd_delay(30); //40ms,等待VDD>4.5V
#ifdef LCD_DATA_8_LINE
  lcd_write(0,0x38);  lcd_delay(20);//10ms
  lcd_write(0,0x38);  lcd_delay(2);//1ms
#endif
#ifdef LCD_DATA_4_LINE
  lcd_write(0,0x33);  lcd_delay(20);//10ms
  lcd_write(0,0x32);  lcd_delay(20);//10ms
  lcd_write(0,0x28);  lcd_delay(20);//10ms
#endif
lcd_write(0,0x01);
lcd_delay(10);
lcd_write(0,0x0c); lcd_write(0,0x06);
}
void lcd_write_str(char line,char* str)
{ char i=0;
while(*str)
{ lcd_write_char(i,line,*str);
  str++; i++; } }
void lcd_write_long(char x,char y,ulong num)
{
lcd_write_char(x+0,y,char_table[(num/1000000)%10]);
lcd_write_char(x+1,y,char_table[(num/100000)%10]);
lcd_write_char(x+2,y,char_table[(num/10000)%10]);
lcd_write_char(x+3,y,char_table[(num/1000)%10]);
lcd_write_char(x+4,y,char_table[(num/100)%10]);
lcd_write_char(x+5,y,char_table[(num/10)%10]);
lcd_write_char(x+6,y,char_table[num%10]);
  lcd_write(1,'H');  lcd_write(1,'Z');
  lcd_write(1,' '); lcd_write(1,' ');lcd_write(1,' '); }
void lcd_write_float(char x,char y,float num)
{  lcd_write_char(x+0,y,char_table[((long)num/10000)%10]);
lcd_write_char(x+1,y,char_table[((long)num/10000)%10]);
lcd_write_char(x+2,y,char_table[((long)num/1000)%10]);
lcd_write_char(x+3,y,char_table[((long)num/100)%10]);
lcd_write_char(x+4,y,char_table[((long)num/10)%10]);
lcd_write_char(x+5,y,char_table[(long)num%10]);
lcd_write_char(x+6,y,'.');    lcd_write_char(x+7,y,char_table[(long)(num*10)%10]);
  lcd_write(1,'H');  lcd_write(1,'Z');
  lcd_write(1,' '); lcd_write(1,' ');lcd_write(1,' ');
}

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51简单频率计设计程序

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