Applications of Embe ...

 #include <main.h> // the file main.h with the

                  // initial settings is included.

                  // This file must be placed in the same

                  // folder with the project.

                  // Also the 18F4550.h file must exist

                  // in the same folder with the project

#include <flex_lcd.h> // The h file of the lcd driver

                      // should be in the same folder where we will save our program.

                      // The #define LCD_DB4 PIN_B4 etc statements in flex_lcd.c

                      // should be checked and possibly modified.

                      // These statements determine the pins of the microcontroller

                      // that are connected to LCD 16x2.

#include <keypad.h>   // The h file of the keypad driver

                      // should be in the same folder where we will save our program.

                      // The #define row0 PIN_B4 etc statements in keypad.h

                      // should be checked and possibly modified.

                      // These statements determine the pins of the microcontroller

                      // that are connected to the keypad 4x4.

#byte PORTB =0xF81

                     // We attribute to the memory position 0xF81 the name PORTB.

                     // This means that we define a 8 bit variable whose value

                     // will be stored to the memory position F81h.

                     // The memory position F81h is the PORTD data register.

#byte PORTD=0xF83    // F83h is the position or PORTD data register

                     // at the data memory of the microcontroller

                     // SFR Special Function Register

//initialization routine

void init(void);

// ********* main program ************************

void main(){

   char k;      //variable for storing the ASCII code of the key pressed

   init();      //initialization routine

   kbd_init();  //initialization routine for the keypad 4x4

   lcd_init();  //initialization routine for the LCD 16x2  

   while(TRUE){

      k=kbd_getc();    //keypad reading

      //If a key is pressed (k! = 0) and if the key pressed is not 'C',

      //the character will appear on the LCD

      if (k!=0 && k!='C'){

         printf(lcd_putc,"%c",k);

      }

      //If 'C' key is pressedm then the screen clears

      else if(k=='C'){

         printf(lcd_putc,"\f");

      } 

   }

}

// initialization routine

void init(void){

   set_tris_d(0x00);    //PORTD is defined as output

}