tachometer with pic16f887

#include "main.h"

#priority CCP1, TIMER1

#define BytePtr(var, offset)   (char *)(&(char *)var + offset)

#byte PIR1 = 0xF9E
#bit  TMR1IF = PIR1.0

int8  gc_timer1_extension = 0;
int8  gc_capture_flag = FALSE;
int32 g32_ccp_delta;

//------------------------------------------------------
#int_timer1
void timer1_isr(void)
{
gc_timer1_extension++;
}

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

#int_ccp1
void ccp1_isr(void)
{
char timer_ext_copy;
int32 current_ccp;
static int32 old_ccp = 0;

gc_capture_flag = TRUE;       

current_ccp = (int32)CCP_1;   

// Get local copy of the timer ext.
timer_ext_copy = gc_timer1_extension; 


if(TMR1IF)
  {
   if(*BytePtr(current_ccp, 1) < 2)  // Was CCP captured after Timer1 wrapped?
      timer_ext_copy++;  // If so, inc the copy of the timer ext.

   // Since we know a timer interrupt is pending, let's just
   // handle it here and now.  That saves a little load off
   // the processor.
   gc_timer1_extension++;  // Increment the real timer extension
   TMR1IF = 0;     // Then clear the Timer1 interrupt
  }

// Insert the timer extension into the proper place in the 32-bit
// CCP value.
// ie.,  Insert it into location "EE" as follows: 0x00EEnnnn
// (nnnn = the CCP).
*BytePtr(current_ccp, 2) = timer_ext_copy;

g32_ccp_delta = (current_ccp > old_ccp) ? current_ccp - old_ccp : current_ccp + (0x1000000 - old_ccp);

// Save the current ccp value for next time.
old_ccp = current_ccp;

}

//=======================
void turometru()
{
int16 frecventa;
int16 frequency;
int32 current_ccp_delta;

set_timer1(0);           
setup_timer_1(T1_INTERNAL | T1_DIV_BY_1);   
setup_ccp1(CCP_CAPTURE_RE);   

// Enable interrupts.
clear_interrupt(INT_TIMER1);
enable_interrupts(INT_TIMER1);

clear_interrupt(INT_CCP1);
enable_interrupts(INT_CCP1);
enable_interrupts(GLOBAL);

//while(1)
//  {
   disable_interrupts(GLOBAL);
   current_ccp_delta = g32_ccp_delta;;
   enable_interrupts(GLOBAL);

   if(gc_capture_flag == TRUE)
     {
    frequency = (int16)((5000000L + (current_ccp_delta >> 1)) / current_ccp_delta);
    frecventa = (frequency * 60)/2;
    
    lcd_gotoxy(5,1);
    printf(lcd_putc,"%lu\n", frecventa);
    printf("%lu\n\r", frecventa);
     // printf(lcd_putc,"%lu Hz, delta = %lx \n\r", frequency, current_ccp_delta);

      gc_capture_flag = FALSE;
    }
  else
    {
    lcd_gotoxy(5,1);
    printf(lcd_putc,"0  \n");
    printf("0  \r");
    }

  delay_ms(100);
 //}

}