Pic låser sig selv

hej...

vi sider og er ved at lave et styringsprogram og programet virker fint men vi har et problem med at det låser sig selv en gang i mellem nogen der kan finde en fejl...
programmet er til en pic16f874

M.V.H. rene kvist. her er koden:

#include <pic.h>
#include <string.h>
#include "C:\ht-pic\samples\delay.h"
#include <stdio.h>
#include "c:\ht-pic\samples\delay.c"


bank1 unsigned char text [20];  // Array for tekst on VFD diplay

int temp;
double temp1 ,temp2;
int ch0, ch1, ch2, ch3, ch5, ch6,ch7,ch8;
   

void lcd()

{
  int i;
  for (i=0; i<strlen(text); i++)
  {
    PORTB = text[i];  // Write a char to VFD
    PORTC = 192;
    PORTC = 0;
  }
  for (i=0; i<40-strlen(text); i++)
  {
    PORTB = 32;    // Fill rest with space
    PORTC = 192;
    PORTC = 0;
  }
}

void pulse(void)                     
{
  int i;
  RC2 = 1;
  RC3 = 1;    // Send pulse with width of "temp" lenght
  for (i=1; i<temp; i++)
    DelayUs(23);  // 100 uS vith 3.2678 MHz crystal
  RC2 = 0;
  RC3 = 0;
}

void interrupt send(void)  // Every 20 mS
{
  temp = 5;    // Startpulse of 0.5 mS lenght
  pulse();
  temp = 5 + (0.01953125 * ch0);  // 10 / 512 = 0.01953125
  pulse();
  temp = 5 + (0.01953125 * ch1);
  pulse();
  temp = 5 + (0.01953125 * ch2);
  pulse();
  temp = 5 + (0.01953125 * ch3);
  pulse();

  if(ch5 > 523 && ch6 < 500)
  {
  temp = 10;
  }

  if(ch5 < 500 && ch6 < 500)
  {
  temp = 15;
  }

  if(ch5 < 500 && ch6 > 523)
  {
  temp = 20;
  }

  pulse();

  if(ch7 > 523 && ch8 < 500)
  {
  temp = 10;
  }

  if(ch7 < 500 && ch8 < 500)
  {
  temp = 15;
  }

  if(ch7 < 500 && ch8 > 523)
  {
  temp = 20;
  }

  pulse();
  T0IF = 0;    // Clear Timer interrupt bit 
}


void main(void)
{
 
  DelayMs(20);    // Wait for VFD is ready to recieve data
  TRISA = 255;    // Port A to input
  TRISB = 0;    // Port B to output
  TRISC = 0;    // Port C to output

  RBIE = 0;    // interrupt on change disabled
  PEIE =0;    // Pereferial interrupt disabled
  GIE = 1;    // global interrupt enable

  ADCON0 = 129;    // 00.000.0.0.1 - 2Tosc. Ch0. DONE, x, A/D-operating
  ADCON1 = 128;    // 1.000.0000  - MSB_of_adrh_0.xxx.All_to_analog

  T0CS = 0;    // Timer 0 increment on every instruction cycle
  T0IE = 1;    // Enable timer0 interrupt
  PSA = 0;    // Prescaler assigned to Timer 0

  PS0 = 1;
  PS1 = 1;
  PS2 = 1;    // Prescaler 1:64 

  T1CON = 1;    // Enable Timer 1

  PORTB = 56;    // 8 Bit interface
  PORTC = 128;
  DelayMs(3);
  PORTC = 0;

  PORTB = 12;    // Display on, Cursor off, Blink off
  PORTC = 128;
  DelayMs(3);
  PORTC = 0;

  PORTB = 1;    // Clear display
  PORTC = 128;
  DelayMs(3);
  PORTC = 0;

  TMR1H = 0;    // Reset 16 bit counter 1
  TMR1L = 0;
  TMR0  = 0;    // Reset 8 bit counter 0

  do {
    sprintf(text, "Danfoss Universe");
    lcd();

    ADCON0 = 129;    // Start A/D converter CH 0
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch0 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 137;  // Start A/D converter CH 1
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch1 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023
 
    ADCON0 = 145;  // Start A/D converter CH 2
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch2 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 153;  // Start A/D converter CH 3
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch3 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 161;  // Start A/D converter CH 5
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch5 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 169;  // Start A/D converter CH 6
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch6 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 177;  // Start A/D converter CH 7
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch7 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    ADCON0 = 185;  // Start A/D converter CH 8
    DelayUs(1);
    ADGO = 1;
    while(!ADIF);
    DelayMs(1);
    ch8 = (ADRESH * 256) + ADRESL; // convert the 16 bit to voltage-value 0-1023

    temp1 = (5.0 / 1023.0) * ch5; // convert the 16 bit to voltage-value 0-5 Volt
    temp2 = (5.0 / 1023.0) * ch6;

    sprintf(text, "%2.2f  %2.2f", temp1, temp2);
    lcd();

  } while(1);
}