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counting pulse with CCP of PIC16f628A

This is the mikcroC code for counting the external pulses frequency Using CCP1 module,
Code:
/* Compiler: MikroC pro
    Author   : Ltsharma
    PIC16F628A - 4Mhz */

sbit LCD_RS at RA4_bit;
sbit LCD_EN at RB0_bit;
sbit LCD_D4 at RA0_bit;
sbit LCD_D5 at RA1_bit;
sbit LCD_D6 at RA2_bit;
sbit LCD_D7 at RA3_bit;

sbit LCD_RS_Direction at TRISA4_bit;
sbit LCD_EN_Direction at TRISB0_bit;
sbit LCD_D4_Direction at TRISA0_bit;
sbit LCD_D5_Direction at TRISA1_bit;
sbit LCD_D6_Direction at TRISA2_bit;
sbit LCD_D7_Direction at TRISA3_bit;
// End LCD module connections
long countrev;
char capture = 0;
unsigned int rpm_timer;
long rpm1;
char RPM[10];




void interrupt()
{
        bit pulse_state ;

        if(PIR1.TMR1IF)
        {
                countrev = 0;
                PIR1.TMR1IF=0;
        }

        if(PIR1.CCP1IF)
        {
                PIR1.CCP1IF = 0;
                switch(pulse_state)
                {
                        case 0:                       //if 1st folling edge reset tmet1 to 0
                        TMR1L = 0;
                        TMR1H = 0;
                        pulse_state = 1;
                        break;

                        case 1:                                  //if 2nd falling edge calculate time
                        rpm_timer = TMR1L;                                 // Get the first 8-bit TIMER1 Counter
                        rpm_timer = rpm_timer+(TMR1H << 8);    // Get the last 8-bit TIMER1 Counter
                        countrev = (int)(60000/rpm_timer);
                        pulse_state = 0;
                          break;

                }


        }

}


void main() {
    TRISB=0X08;                                       // Pin B3 set as CCP1 Input    
   cmcon=0X07;
   CCP1CON = 0b0100;                             // Capture every falling edge 
  T1CON = 0x31;                                 // Timer1 (Prescale = 8)
  PIE1.TMR1IE = 1;                              // Enable Timer1 overflow Interrupt
  PIR1.TMR1IF = 0;                              // TMR1 overflow cleared
  PIE1.CCP1IE = 1;                              // enable interrupt capture
  PIR1.CCP1IF = 0;                              //clear CCP flag
  INTCON.PEIE = 1;                              // Enables all low-priority peripheral interrupts
  INTCON.GIE = 1;                               // global interrupts 
  
  Lcd_init();                                        

  lcd_cmd(_lcd_clear);

  while(1){
  rpm1 = countrev;

  longtostr(rpm1,RPM);           // Convert to long int to string

  LCD_out(1,1,RPM);
        rpm1 = 0;    

                                
 }                            
 }

It will show values from 4Hz to 2Khz properly

proteus diagrams herer

ccp.PNG

CCP2.PNG


and also project files (MikroC+proteus ) View attachment 100035

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Author
ltsharma
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