Frequency counter with pic16f877a and display on the lcd

Hi,every body I want to read the frequency from the function generator and use the PIC16F877A
here below are my codes which are not working can you please help me to handle the issue.


Help me plz.

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The codes are here below:
#include <16F877A.h>
#device adc=10
#fuses XT, NOWDT, NOPROTECT, PUT, BROWNOUT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C2, INVERT)
#include "lcd.c"

int16 capture_rising_edge;
int16 got_pulse_width;
int16 ccp_delta;

#int_ccp1
void ccp1_isr(void)
{
static int16 t1_rising_edge;

// If current interrupt is for rising edge.
if(capture_rising_edge)
{
setup_ccp1(CCP_CAPTURE_FE);
capture_rising_edge = FALSE;
t1_rising_edge = CCP_1;
}
else
{
setup_ccp1(CCP_CAPTURE_RE);
capture_rising_edge = TRUE;
ccp_delta = CCP_1 - t1_rising_edge;
got_pulse_width = TRUE;
}

}

//==================================
main()
{
int16 pulse_width_ms, local_ccp_delta;

got_pulse_width = FALSE;
capture_rising_edge = TRUE;

output_low(pin_C0);

setup_ccp1(CCP_CAPTURE_RE);
setup_timer_1(T1_INTERNAL | T1_DIV_BY_8 );
clear_interrupt(INT_CCP1);
enable_interrupts(INT_CCP1);
enable_interrupts(GLOBAL);

while(1)
{
output_high(pin_C0);
delay_ms(100);
output_low(pin_C0);

if(got_pulse_width)
{
disable_interrupts(GLOBAL);
local_ccp_delta = ccp_delta;
enable_interrupts(GLOBAL);
pulse_width_ms = local_ccp_delta / (125);

printf("%lu\n\r", pulse_width_ms);

got_pulse_width = FALSE;
}

delay_ms(500);
}

}