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

#byte PORTB =0xF81  

/* We attribute to the memory position 0xF81 the name PORTB. This means that we define an 8-bit variable whose value will be stored to the memory position F81h.*/

#byte PORTD =0xF83

// The position F83h is the PORTD data register.

void push_button(void);

//Declaration of push-button function           

void main()

{  

   //PortD becomes output

   //PortB becomes input

   PORTD=0x0F;

   //PortD is given initial value 00001111

   while(TRUE) { 

  //The push-button function is called

  //switch states in PORTD bits

      }                

}

//Define push_button function

//The function definition is written after the main program

//With this function the microcontroller waits

//a full button press (press+release)

//and then go to the next command.

void push_button(void) {                

       // Wait until the button is pressed

// In the wait state, no command is executed

// When the button is pressed the loop is exited

// and the next command is executed

      // 50ms delay to avoid bounce effect

      //Wait until the button is released                                 

// In the wait state, no command is executed

// When the button is released the loop is exited

// and the next command is executed

      // 50ms delay to avoid bounce effect