Question

1. Making use of MPLAB IDE, write firmware code to switch all LED’s connected to port pins RD0-RD7 continuously on for one second and then off for one second. 2. First use a flowchart to determine the program structure and then generate your commented firmware source code.

Answer 1

1:

#include <htc.h>
#define _XTAL_FREQ 8000000
void main()
{
TRISD0 = 0;
TRISD1 = 0;

TRISD2 = 0;

TRISD3 = 0;

TRISD4 = 0;

TRISD5 = 0;

TRISD6 = 0;

TRISD7 = 0;

RD0 = 0;
RD1 = 0;
RD2 = 0;
RD3 = 0;
RD4 = 0;
RD5 = 0;
RD6 = 0;
RD7 = 0;
  while(1)
  { 
    RD0 = 1;
    RD1 = 1;
    RD2 = 1;
    RD3 = 1;
    RD4 = 1;
    RD5 = 1;
    RD6 = 1;
    RD7 = 1;
   
    __delay_ms(1000);
    RD0 = 0;
    RD1 = 0;
    RD2 = 0;
    RD3 = 0;
    RD4 = 0;
    RD5 = 0;
    RD6 = 0;
    RD7 = 0;
    __delay_ms(1000);
  }
}