Pic 18f4550 capture mode - c

Question

I would like to measure a pulse using the pic 18f4550 in capture mode, this pulse is generated by the pic microcontroller itself, for this I use a function which plays the role of the XOR logic gate (you find the function that I've used below). with RC0 and RC2 the inputs and RC6 the signal output. the pulse leaving RC6 enters ccp2 to be measured.
The problem I found is that the ccp2 cannot detect the impulse generated by the microcontroller. I don't know if there are any conditions to connect the pins of the microcontroller or something.
If anyone has an answer or a hint to fix this, I will be grateful!
and if you have any questions feel free to ask .thanks !!
UPDATE: I changed some instructions in the code, now the RC6 output provides a signal. but my LCD does not display anything. the RC6 output is present below.
UPDATE 2: the while(1) in the xor() function blocking the rest of my program, so the program never get out of xor() and my LCD wont display anything. when I don't use the while loop in xor () my RC6 produce anything, the same for the LCD.
I don't know where the problem is, I did everything in my power to find the bug . but the system still not working!!!
I will leave the program as it is, so new readers can understand what I am talking about.
#include <stdio.h>
#include <stdlib.h>
#include "osc_config.h"
#include "LCD_8bit_file.h"
#include <string.h>
unsigned long comtage,capt0,x;
char pulse[20];
char cosinus[20];
float period,dephTempo,deph,phi;
void init (){
IRCF0 =1; /* set internal clock to 8MHz */
IRCF1 =1;
IRCF2 =1;
PIE2bits.CCP2IE=1;
PIR2bits.CCP2IF=0;
CCPR2 =0; /*CCPR1 is capture count Register which is cleared initially*/
T3CONbits.RD16=1;
T3CKPS0=0;
T3CKPS1=0;
TMR3CS=0;
TMR3IF=0;
T3CCP2=0; /*Timer3 is the capture clock source for CCP2*/
}
void xor()
{
while(1)
{
if (PORTCbits.RC0==PORTCbits.RC2)
{
PORTCbits.RC6=0;
}
else if (PORTCbits.RC0!=PORTCbits.RC2)
{
PORTCbits.RC6=1;
}
}
}
void main()
{
TRISCbits.TRISC0=1;
TRISCbits.TRISC2=1;
TRISCbits.TRISC6=0;
xor();
LCD_Init();
while(1)
{
CCP2CON = 0b00000101;
PIR2bits.CCP2IF = 0;
TMR3ON = 0;
TMR3 = 0;
while (!PIR2bits.CCP2IF);
TMR3ON = 1;
CCP2CON = 0b00000100;
PIR2bits.CCP2IF = 0;
while (!PIR2bits.CCP2IF);
comtage = CCPR2;
dephTempo = (((float)comtage /30.518)/65536 );
sprintf(pulse,"%.3f ",dephTempo);
LCD_String_xy(0,0,"the pulse width is : ");
LCD_String_xy(2,9,pulse);
}
}