Applications of Embe ...

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

                                // It must be in the same folder with the project

#byte PORTB=0xF81 // F81 Is the position or PORTB data register

                                    // at the data memory of the microcontroller

                                    // SFR Special Function Register

#byte PORTD=0xF83  // F83 Is the position or PORTB data register

                                      // at the data memory of the microcontroller

                                     // SFR Special Function Register

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

void main()

{                                  // Opening bracket of main

set_tris_b(0x00);          // PORTB is set as output port

                                     // (PORTB Direction Register = 0000 0000)

set_tris_d(0xff);            // PORTD is set as input port 

                                      // (PORTD Direction Register = 1111 1111)

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

int i=0;                               // Integer varable used in the  for() { }

int a;                                   // Integer varable a

while(TRUE) {                  //Endless loop(condition always true)

            a=0;

            for (i=0; i<=7; i++){

…………………………………………………………………………

Complete the program with the necessary commands

 ………………………………………………………..……………….

                                            }  // Closing bracket of for() { }

            PORTB=a;                  // PORTB takes the value of the variable a

                                                // Variable a equals the multitude of 1s of  PORTD

            }                                  // Closing bracket of while

}                                              // Closing bracket of main

Tip1. The function bit_test(PORTD,i) checks the bit i of PORTD data register. If the bit equals to 1 then the function returns the value 1. If the bit is 0, then the function returns the value 0.

Tip2. We can use the counter a=a+ bit_test(PORTD,i) to count the 1s of PORTD