[PIC] Frequency meter using CCP capture module

[mnyama]

My brotherz, actually am doing frequency measuring of pulses using ccp modules with pic 16f887+mikroc compiler, after fooling myself arround the code,ultimately, i managed to construct the codez, but there is stil one problem that needs to be rectified, since the results obtained on LCD is not stable, at one time, there is a wrong results, and another instant there is correct results, i dont know what causes this wrong answer to appear on the LCD,can somebody help me out, because it is my project, help me out, look on the codez below, and two snaps, one showing correct results 3KHZ(CCP1), but other showing the wrong strange results(CCP2), these two keeps alternating continously, could any1 help me, especially on the way to declare variables?

 //lcd configuration
sbit LCD_RS at RD4_bit;
sbit LCD_EN at RD5_bit;
sbit LCD_D4 at RD0_bit;
sbit LCD_D5 at RD1_bit;
sbit LCD_D6 at RD2_bit;
sbit LCD_D7 at RD3_bit;
sbit LCD_RS_Direction at TRISD4_bit;
sbit LCD_EN_Direction at TRISD5_bit;
sbit LCD_D4_Direction at TRISD0_bit;
sbit LCD_D5_Direction at TRISD1_bit;
sbit LCD_D6_Direction at TRISD2_bit;
sbit LCD_D7_Direction at TRISD3_bit;
//end of lcd configuration

 unsigned int t1,t2,T=0;
 float t3,tp=0;
 unsigned char cpf,cnt=0; //variables as count
 char txt[15];

void system_init()
{
// Configure AN pins as digital I/O
ANSEL = 0x00;
ANSELH = 0x00;

// Disable comparators
 C1ON_bit = 0;
 C2ON_bit = 0;
  //configuring  PORTD is output
 TRISD = 0;
 PORTD =0;
  //setting the RC2/CCP1 pin as input
 PORTC.F2=1;  //set the RC2/CCP1 pin as input
 INTCON = 0b11000000;  // Enable interrupt (bits GIE+peripheral)
PIE1=0b00000101; //except for the TMR1IE&CCP1IE bits
T1CON = 0b00000001; /*T1 on,sychronised,prescaler value 1:1 */
CCP1CON=0b00000111; //capture every 16th rising edge
Lcd_Init();                 // Initialize LCD
Lcd_Cmd(_LCD_CLEAR);        // CLEAR display
Lcd_Cmd(_LCD_CURSOR_OFF);   // Cursor off
TMR1H=0; //initialize the TMR1H&TMR1L
TMR1L=0;

CCPR1H=0; //clear the ccp register
CCPR1L=0;
}
 void interrupt()
 {
  if(PIR1.F2==1)   //ccp capture flag bit
  {
  PIR1.F2=0; //clear flag bit
  cpf++; //record the ccp flag bit
  }
  if(PIR1.F0==1)    //timer1 overflow flag bit
  {
   PIR1.F0=0; //clear the flag bit
   cnt++; //record the t1 overflows
  }
}


void main() {
system_init();  //configurin the system
Lcd_Out(1,1,"Freq meter");


for(;;)
{
 if(cpf==1)  //wait here untill the first captured rising edge
 {
  t1=CCPR1H*256+CCPR1L;   //copy the content of the ccp--->t1 variable
 }
 
if(cpf==2)//wait here until the 2nd captured value
{
 T1CON.F0=0; //stop the timer1
 INTCON = 0b00000000;//clear all interrupt
 t2=CCPR1H*256+CCPR1L+cnt*65536;
 T=t2-t1;  //find the difference between 2nd capture - 1st captured  value
 t3=T/16; //divide the difference in time by 16 due to ccp prescalar value 1:16
 tp=(1/t3)*1000000;
FloatToStr(tp,txt);// convert the t3 into string txt
 Lcd_Out(2,1,txt);//send the results to lcd
 Lcd_Out_Cp("Hz"); //units in microsecond because of 4Mhz crsystal, 4Mhz/4=1Mhz
                   //this is equevalent to 1microsecond internal timer period
 TMR1H,TMR1L=0; //clear the timer to zero for next round trip
cpf,cnt=0;  //reset the counter variables
CCPR1H,CCPR1L=0; //reset the ccp variable
T1CON.F0=1; //switch on the timer again
INTCON = 0b11000000;//Re-enabling the interrupt again
}
}

}