Here is a simple program I made that turns on specific ports for the PIC mcu.
#include "pic.h"
#define bitset(var,bitno) ((var) |= 1 << (bitno))
#define bitclr(var,bitno) ((var) &= ~(1 << (bitno))
void initialize(void){
bitclr(STATUS, RP0); //set bank 0
PORTA = 0x00; //initialize
PORTB = 0x00;
bitset(STATUS, RP0); //set bank 1
TRISA = 0xFF; //set port a pins to input
TRISB = 0x00; //set port b pins to output
}
void main(){ //main program
initialize(); //run initialization
while (1){ //continuous run
if (RA0 == 0){ //if singal is low then only turn on some port b pins
PORTB = 0b00111100;
}
else{ //otherwise all on
PORTB = 0xFF;
}
}
}
Just connect a VDD source to the MCU, and to the MCLR pin. Also connect a VDD source to a switch. The other side of the switch should connect to the pin RA0 and VSS (place a 10k resistor between VSS and the switch). Make sure the PIC is also powered (VDD and VSS) and connect and LED to all the RB# pins. With the code above, it should work.
Cheers,
Miguel V
National Instruments
