[PIC] how to measure the frequency of square wave using pic?

#include<htc.h>
#define lcd PORTD
#define rs RE0
#define en RE1
#define trrs TRISE0				   
#define tren TRISE1

unsigned char cal=0;
unsigned char lsb=0;
unsigned char msb=0;
unsigned char mmb=0;
unsigned int temp=0;
unsigned int tp=0;
unsigned char ton=0;
unsigned char toff=0;

lcd_delay()
{
unsigned char i;
for(i=0;i<252;i++);
}

void lcd_datawrite(unsigned char data)
{
rs=1;
lcd=data;
en=1;
lcd_delay();
en=0;
}

void lcd_cmdwrite(unsigned char data)
{
rs=0;
lcd=data;
en=1;
lcd_delay();
en=0;
}

void lcd_install()
{
TRISD=0x00;				   
trrs=0;				   
tren=0;
lcd_cmdwrite(0x38);  // 5x7 dots ini 
lcd_cmdwrite(0x0C);  // cursor on disp on
lcd_cmdwrite(0x80);  // move to 1st lint 1st loc
lcd_cmdwrite(0x01);  // clear disp
}

void lcd_stringwrite(unsigned char *ptr)
{
while(*ptr!='\0'){
lcd_datawrite(*ptr);
ptr++;
}
}

void main()
{
ADCON1=0x0F;
	
lcd_install();

CCP1CON=0X05;
T3CON=0X0;
T1CON=0X00;
TRISB=0;
TRISD=0;
TRISC2=1;
CCPR1L=0;
CCPR1H=0;
CCP1M0=1;
while(1)
{
TMR1H=0;
TMR1L=0;
CCP1M0=1;
CCP1IF=0;
while(CCP1IF==0);
TMR1ON=1;
CCP1IF=0;
while(CCP1IF==0);
TMR1ON=0;
temp=tp=((CCPR1L+2)*2);
lsb=temp%10;
temp=temp/10;
mmb=temp%10;
msb=temp/10;
lcd_cmdwrite(0x80);
lcd_stringwrite("TP=");
lcd_datawrite(0x30|msb);
lcd_datawrite(0x30|mmb);
lcd_datawrite('.');
lcd_datawrite(0x30|lsb);
TMR1H=0;
TMR1L=0;
CCP1IF=0;
while(CCP1IF==0);
TMR1ON=1;
CCP1M0=0;
CCP1IF=0;
while(CCP1IF==0);
TMR1ON=0;
temp=ton=((TMR1L-1)*2);
lsb=temp%10;
temp=temp/10;
mmb=temp%10;
msb=temp/10;
lcd_stringwrite(" TON=");
lcd_datawrite(0x30|msb);
lcd_datawrite(0x30|mmb);
lcd_datawrite('.');
lcd_datawrite(0x30|lsb);
temp=toff=tp-ton;
lsb=temp%10;
temp=temp/10;
mmb=temp%10;
msb=temp/10;
lcd_cmdwrite(0xC0);
lcd_stringwrite("TOff=");
lcd_datawrite(0x30|msb);
lcd_datawrite(0x30|mmb);
lcd_datawrite('.');
lcd_datawrite(0x30|lsb);
}
}