// Declaration 4x4 keyboard port
 char keypadPort at PORTC;
 // Definition pins for LCD.
 sbit LCD_RS at RB4_bit;
 sbit LCD_EN at RB5_bit;
 sbit LCD_D7 at RB3_bit;
 sbit LCD_D6 at RB2_bit;
 sbit LCD_D5 at RB1_bit;
 sbit LCD_D4 at RB0_bit;
 // Definition of TRIS registers for LCD.
 sbit LCD_RS_Direction at TRISB4_bit;
 sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D7_Direction at TRISB3_bit;
 sbit LCD_D6_Direction at TRISB2_bit;
 sbit LCD_D5_Direction at TRISB1_bit;
 sbit LCD_D4_Direction at TRISB0_bit;
 // Function to decode the keyboard.
 char ReadKey (void)
 {
 // Switch case structure to assess the values ??returned
 // by press keyboard.
 switch (Keypad_Key_Press ())
 {
 case 1: return '1';
 case 2: return '2';
 case 3: return '3';
 case 4: return 'A';
 case 5: return '4';
 case 6: return '5';
 case 7: return '6';
 case 8: return 'B';
 case 9: return '7';
 case 10: return '8';
 case 11: return '9';
 case 12: return 'C';
 case 13: return '*';
 case 14: return '0';
 case 15: return '#';
 case 16: return 'D';
 default: return 0; // button not pressed.
 }
 }

void main (void)
 {
            // Declaration of variables.
            char key;
            // Setup and initialization of PIC.
            Lcd_init ();                             // Initialize the LCD.
            Lcd_Cmd (_LCD_CURSOR_OFF);          // Turns off the cursor.
            Lcd_Out (1, 1, "key");                      // Print text.
            while (1)                                              // infinite loop.
            {
                 Key = ReadKey ();                       // It reads the keyboard and its result is stored in key.
                 Lcd_Chr (2,1, key);                      // Display the value returned by the keyboard.
            }
 }