CI - PreviS10

#include <xc.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "GLCD.h"
#define _XTAL_FREQ 8000000

volatile unsigned int state_changed = 0, select = 1;

void configAD()
{
   TRISA = 0xFF;
   TRISB = 0x00;
   TRISD = 0x00;

   ADCON0 = 0x01; // Selects Channel AN0
   ADCON1 = 0x0D; // RA0 and RA1 set as analog
   ADCON2 = 0x24; // Left justified, TAD = 8, FOSC/4
}

void config_interrupts()
{
   INTCONbits.GIE = 1; // Enable global interrupts
   INTCONbits.PEIE = 1; // Enable peripheral interrupts
   INTCON = 0b10100111;
   RCONbits.IPEN = 1;
}

void config_timer0()
{
   T0CONbits.TMR0ON = 1; //Enable TMR0
   T0CONbits.T08BIT = 0; //16-bit
   T0CONbits.T0SE = 0;   //On rising edge
   T0CONbits.PSA = 0;    //We choose prescale value
}

void interrupt change_AD(void)
{
   if (INTCONbits.TMR0IE == 1 && INTCONbits.TMR0IF == 1) {
      ADCON0bits.GO = 1;
      while (GO == 1);
      if (select == 1) {
     select = 2;
     state_changed = 1;
     ADCON0 = 0x05;
      }
      else if (select == 2) {
     select = 1;
     state_changed = 2;
     ADCON0 = 0x01;
      }
   }
   INTCONbits.TMR0IF = 0;
   return;
}

void main(void)
{
   configAD();
   GLCDinit();
   config_interrupts();
   config_timer0();
   setStartLine(0);
   clearGLCD(0, 7, 0, 127);
   writeTxt(0, 0, "RA0 = ");
   writeTxt(2, 0, "RA1 = ");
   while (1) {
      if (state_changed == 1) {
     float aux = (ADRESL >> 6) + (ADRESH << 2);
     aux = (aux*5)/1023;
     int integer_part = aux;
     int decimal_part = (aux * 100);
     decimal_part = decimal_part%100;
     clearGLCD(0, 0, 36, 127);
     writeNum(0, 36, integer_part);
     putch(0, 42, '.');
     writeNum(0, 48, decimal_part);
     state_changed = 0;
     INTCON = 0b10100111;
      }
      else if (state_changed == 2) {
     float aux = (ADRESL >> 6) + (ADRESH << 2);
     aux = (aux*5)/1023;
     int integer_part = aux;
     int decimal_part = aux * 100;
     decimal_part = decimal_part%100;
     clearGLCD(2, 2, 36, 127);
     writeNum(2, 36, integer_part);
     putch(2, 42, '.');
     writeNum(2, 48, decimal_part);
     state_changed = 0;
     INTCON = 0b10100111;
      }
   }
}

//JosepRivaille