LCD Keypad Interface - PIC18F4550

/*******************************************************************************
Program for, LCD Keypad Interfacing
MCU: PIC18F4550; X-Tal: 8MHz(internal); Compiler: mikroC pro for PIC v7.6.0
Date: 19-08-2021;
*******************************************************************************/

sbit LCD_RS at LATB4_bit;
sbit LCD_EN at LATB5_bit;
sbit LCD_D4 at LATB0_bit;
sbit LCD_D5 at LATB1_bit;
sbit LCD_D6 at LATB2_bit;
sbit LCD_D7 at LATB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;

// global variables
char keypadPort at PORTD; // required by 4x4 keypad library
char text[17];
char ascii_to_int( char);


void main() {

  char pulsador = 0;
  char valor;
  TRISB = 0x00;
  TRISC = 0x00;

  Keypad_Init();

  LCD_Init(); // Inicializamos la pantalla LCD
  LCD_Cmd(_LCD_CLEAR); // Limpia la pantalla LCD
  LCD_Cmd(_LCD_CURSOR_OFF); // Apaga el cursor en la pantalla
  Delay_ms(500); // Retardo de 500 milisegundos

  do {
    pulsador = Keypad_Key_Press();
    valor = ascii_to_int(pulsador);
    //ByteToStr(pulsador, text);
    //Lcd_Out(1, 1, "ASCII:");
    //Lcd_Out_Cp(text);
    Lcd_Out(1, 1, "Key: ");
    Lcd_Chr(1, 6, valor);
  } while (1);
}

char ascii_to_int(char pulsador) {
  switch (pulsador) {
    case 1: pulsador = 55; return pulsador; break;  // 7
    case 2: pulsador = 56; return pulsador; break;  // 8
    case 3: pulsador = 57; return pulsador; break;  // 9
    case 4: pulsador = 47; return pulsador; break;  // /
    case 5: pulsador = 52; return pulsador; break;  // 4
    case 6: pulsador = 53; return pulsador; break;  // 5
    case 7: pulsador = 54; return pulsador; break;  // 6
    case 8: pulsador = 42; return pulsador; break;  // *
    case 9: pulsador = 49; return pulsador; break;  // 1
    case 10: pulsador = 50; return pulsador; break; // 2
    case 11: pulsador = 51; return pulsador; break; // 3
    case 12: pulsador = 45; return pulsador; break; // -
    case 13: pulsador = 67; return pulsador; break; // c/on
    case 14: pulsador = 48; return pulsador; break; // 0
    case 15: pulsador = 61; return pulsador; break; // =
    case 16: pulsador = 43; return pulsador; break; // +
  }
}