Applications of Embe ...

 #include<main.h>  //The file <main.h> contains the initial settings

                  //This file must be in the same folder

                  //with your project

#byte PORTB=0xF81 //F81 is the address of the PORTB data register

                  // in the data memory of the PIC18F4550 microcontroller.

                  // It's a Special Function Register (SFR)

#byte PORTD=0xF83  //F83 is the address of the PORTB data register

                  // in the data memory of the PIC18F4550 microcontroller.

                  // It's a Special Function Register (SFR)

 

// ********* Main program ************************

 

void main()

{                             // Opening bracket of main()

 

set_tris_b(0x00);   // PORTB becomes output(Direction Register=0000 0000)

set_tris_d(0xff);    // PORTD becomes input(Direction Register=1111 1111)

 

PORTB=0b00000000;   // PORTB takes the initial value 0000 0000

 

int a;                                // definition of integer variable a for storing the value

                                        // of PORTD

int i;                                 // Integer variable we use inside the for

                                        // With the while (TRUE){   } the content inside the brackets

                                        // is executed endless

                                        // The word TRUE corespondes to a true condition.

                                        // Instead of TRUE we could use the condition 5>1

                                        // or any othere condition that is always true.

while(TRUE) {               //Eternal loop (contition always true)

            a=PORTD;          //The content of PORTD data register is transfered

                                        // to the variable a

            switch (a){

                case 0:  PORTB=0xFF; delay_ms(100); PORTB=0x00; delay_ms(100);

                            // Progran turning ON and OFF when a=0 (PORTD = 0000 0000)

                            break;

                      

               case 1: PORTB=0b11000011;delay_ms(100);PORTB=0b00111100;delay_ms(100);

                              // Progran turning ON and OFF when  a=1 (PORTD = 0000 0001)

 

                               break;

           

                case 2: PORTB=0b10101010;delay_ms(100);PORTB=0b01010101;delay_ms(100);  

                                // Progran turning ON and OFF when a=2 (PORTD = 0000 0010)

 

                              break;

                      

                  case 3: PORTB=0b10000000; for (i=1; i<=7; i++)

                                                                    {delay_ms(50); PORTB=PORTB/2;}

                                                                     delay_ms(50);

                                // Progran turning ON and OFF when a=3 (PORTD = 0000 0011)

 

                                break;

               

                     case 4: PORTB=0xF0; delay_ms(100); PORTB=0x0F; delay_ms(100);

                                // Progran turning ON and OFF when a=4 (PORTD = 0000 0100)

 

                                break;

                      

                     } // Closing bracket of switch ()

 

            } //Closing bracket of while ()

 

} // Closing bracket of main ()