Frequency-Counter

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http://www.eeweb.com/project/circuit_projects/frequency-counter-by-pic16f628

Frequency-Counter-1326216670.rar

PIC16F628기반

Hi-Tech PIC C Compiler 사용

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//---------------------------------------------

// FREQUENCY COUNTER

// www.circuit-projects.com

// Y.Erol

//---------------------------------------------

#include <pic.h>

#include <delay.c>

__CONFIG(WDTDIS&PWRTEN&LVPDIS&XT);

unsigned char kontrol;

//---------------------------------------------

//     CCP1 INTERRUPT

//---------------------------------------------

void interrupt interrupt(void)

{

TMR1H=0; TMR1L=0;

GIE=0;

control=1; 

CCP1IF=0;

GIE=1;

}

//---------------------------------------------

// MAIN PROGRAM

//---------------------------------------------

main(void)

{

unsigned const char number[10]={0x3F,0x06,0x5B,

     0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

unsigned char select[4]={1,2,4,8};

unsigned int counter,value,remainder1,remainder2;

float frekans;

unsigned char a,i,display[5],data;

TRISA=0x00;

TRISB=0x08;

CMCON=0x07;

cont=0;

PORTA=0; PORTB=0

CCP1IE=1;

CCP1CON=0b00000110; 

T1CON=0b00100001;

 

GIE=1;

PEIE=1;

for(;;){

counter=256*CCPR1H+CCPR1L;

if(control==1)frequency=100000000/counter;

if(kontrol==0)frequency=0;

if(counter<10000)frequency=0; 

control=0;

for(a=0;a<25;a++){ 

value=(int)frequency;

display[1]=value/1000;

remainder1=value-display[1]*1000;

display[2]=remainder1/100;

remainder2=remainder1-display[2]*100;

display[3]=remainder2/10;

display[4]=remainder2-display[3]*10;

for(i=0;i<4;i++){

PORTB=0;

PORTA=0;

data=number[display[i+1]];

PORTB=data&0x07;

data=data<<1;

PORTB=PORTB|(data&0xF0);

PORTA=select[i];

DelayMs(3);

}

} 

}

}

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https://electrosome.com/analog-comparator-pic-microcontroller/

CMCON = 0x07

CMCON |= 7;