Chapter 2 : Digital Input and Output

Schematic Diagram Circuit

 

 

 

 

Realization of Circuit on Breadboard

Exercise 1

Source Code :

//Exercise 1 : Lighting LEDs using HEX and BINARY format

 

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M) 

 

//Main Function

void main()

{

  //Set PORTD as output

  set_tris_d(0x00); //set_tris_d(0b00000000);

 

  //Initialize PORTD

  output_d(0x00); //output_d(0b00000000);

 

  while(true)

  {

     output_d(0xFF);//output_d(0b11111111);

     delay_ms(100);

     output_d(0x00); //output_d(0b00000000);

     Delay_ms(100);

  }

}

 

 

 

Exercise 2:

Source Code:

//*********************************************************

 

//Exercise 2 : Lighting LED2 and LED4

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M)

 

//Define LEDs

#define   LED1 PIN_D0

#define   LED2 PIN_D1

#define   LED3 PIN_D2

#define   LED4 PIN_D3

#define   LED5 PIN_D4

#define   LED6 PIN_D5

#define   LED7 PIN_D6

#define   LED8 PIN_D7

 

//Main Function

Void main()

{

     //Set PORTD as output

     Set_tris_d(0x00); //set_tris_d(0b00000000);

 

     //Initialize PORTD

     Output_d(0x00); //output_d(0b00000000);

 

     While(true)

     {

          //Turn ON even number LEDs

          Output_high(LED2);

          Output_high(LED4);

          Output_low(LED6);

          Output_low(LED8);

          Delay_ms(100);

     }

}

 

 

Exercise 3:

 

Source Code:

 

//*********************************************************

 

//Exercise 3 : Creating Running Light

 

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M)

 

//Define LEDs

#define   LED1 PIN_D0

#define   LED2 PIN_D1

#define   LED3 PIN_D2

#define   LED4 PIN_D3

#define   LED5 PIN_D4

#define   LED6 PIN_D5

#define   LED7 PIN_D6

#define   LED8 PIN_D7

 

 

//Main Function

Void main()

{

     //Set PORTD as output

     Set_tris_d(0x00); //set_tris_d(0b00000000);

 

     //Initialize PORTD

     Output_d(0x00); //output_d(0b00000000);

 

     While(true)

     {

          //Running Light

          Output_d(0x01); //output_d(0b00000001);

          Delay_ms(100);

          Output_d(0x02); //output_d(0b00000010);

          Delay_ms(100);

          Output_d(0x04); //output_d(0b00000100);

          Delay_ms(100);

          Output_d(0x08); //output_d(0b00001000);

          Delay_ms(100);

          Output_d(0x10); //output_d(0b00010000);

          Delay_ms(100);

          Output_d(0x20); //output_d(0b00100000);

          Delay_ms(100);

          Output_d(0x40); //output_d(0b01000000);

          Delay_ms(100);

          Output_d(0x80); //output_d(0b10000000);

          Delay_ms(100);

    

     }

}

 

 

 

Exercise 3a: (Simplified)

Source Code:

//*********************************************************

 

//Exercise 3A : Creating Running Light (Simplified)

 

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M)

 

//Define LEDs

#define   LED1 PIN_D0

#define   LED2 PIN_D1

#define   LED3 PIN_D2

#define   LED4 PIN_D3

#define   LED5 PIN_D4

#define   LED6 PIN_D5

#define   LED7 PIN_D6

#define   LED8 PIN_D7

 

 

//Main Function

Void main()

{

     int i,j;

     char PORTD;

 

     //Set PORTD as output

     Set_tris_d(0x00); //set_tris_d(0b00000000);

 

     //Initialize PORTD

     Output_d(0x00); //output_d(0b00000000);

 

     While(true)

     {

          PORTD=0x01;

          For (int i=0;i<=7;i++)

          {

              PORTD=PORTD<<1 o:p="">

              Output_d(PORTD);

              Delay_ms(100);

          }

         

          PORTD=0x80;

          For(int j=0;j<=7;j++)

          {

              PORTD=PORTD>>1;

              Output_d(PORTD);

              Delay_ms(100);

          }

    

     }

}

 

 

Exercise 4:

Source Code:

 

//*********************************************************

 

 

 

//********************************************************* 

//Exercise 4 : Count Up

 

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M)

//Define LEDs

#define   LED1 PIN_D0

#define   LED2 PIN_D1

#define   LED3 PIN_D2

#define   LED4 PIN_D3

#define   LED5 PIN_D4

#define   LED6 PIN_D5

#define   LED7 PIN_D6

#define   LED8 PIN_D7

//Main Function

Void main()

{

     //Set PORTD as output

     Set_tris_d(0x00); //set_tris_d(0b00000000);

     //Initialize PORTD

     Output_d(0x00); //output_d(0b00000000);

     While(true)

     {

          //Count Up

          output_d(0b00111111);//0

          Delay_ms(100);

          output_d(0b00000110);//1

          Delay_ms(100);

          output_d(0b01011011);//2

          Delay_ms(100);

          output_d(0b01001111);//3

          Delay_ms(100);

          output_d(0b01100110);//4

          Delay_ms(100);

          output_d(0b01101101);//5

          Delay_ms(100);

          output_d(0b01111101);//6

          Delay_ms(100);

          output_d(0b00000111);//7

          Delay_ms(100);

          output_d(0b01111111);//8

          Delay_ms(100);

          output_d(0b01101111);//9

          Delay_ms(100);

 

     }

}

 

 

 

 

Exercise 5:

 

Source Code:

 

 

//*********************************************************

//Exercise 5 : Button

#include <18f4550.h> //Header file

#fuses HS, NOLVP, NOWDT, NOPROTECT  // Hardware configuration

#use delay (clock = 20M)

//Define LEDs

#define   LED1 PIN_D0

#define   LED2 PIN_D1

#define   LED3 PIN_D2

#define   LED4 PIN_D3

#define   LED5 PIN_D4

#define   LED6 PIN_D5

#define   LED7 PIN_D6

#define   LED8 PIN_D7

 

//Define Button

#define   BUTTON1   PIN_B0

#define   BUTTON2   PIN_B1   

//Main Function

Void main()

{

     //Set PORTD as output

     Set_tris_d(0x00); //set_tris_d(0b00000000);

     //Set PORTB as input

     Set_tris_b(0xff); //set_tris_b(0b11111111);

     //Initialize PORTD

     Output_d(0x00); //output_d(0b00000000);

     While(true)

     {

          If(!input(BUTTON1)) //Press Button1

 

          {

               //7Segment ON

               output_d(0b00111111);//0

               Delay_ms(100);

          }

          Else

          {

              //7Segment OFF

              output_d(0b00000000);//0

              Delay_ms(100);

          }

     }

}