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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);
}
}
}
}
https://electrosome.com/analog-comparator-pic-microcontroller/
CMCON = 0x07
CMCON |= 7;
