PIC18F2580 DC motor driver program not working

[Cantafford]

Hello,

I'm trying to interface a DC motor with a LD239D full bridge driver using a PIC18F2580.
The truth table for the LD239D is(in my case):
Rc0 = 1; Rc1=0; => CW rotation
Rc0 = 0; Rc1=1; => CCW rotation
Rc0 = 0; Rc1=0; => motor stops
Rc0 = 1; Rc1=1; => motor stops


This is my schematic:

And this is the code:

/*
* File:   driver.c
* Author: me
*
* Created on October 23, 2015, 11:06 AM
*/

#include <stdio.h>
#include <stdlib.h>
#include "config.h"

void main()
{
OSCCON = 0x76; // set internal oscillator to 8Mhz
TRISA = 0b11111111; // portA as input(the switches)
TRISC = 0b11111100; // set portC as output(RC0 = in1, RC1 = in2)

while(1)
{
    
     if(PORTAbits.RA0 == 0 && PORTAbits.RA1 == 1 && PORTAbits.RA2 == 1) // clockwise
     {LATCbits.LATC0 = 1; LATCbits.LATC1 = 0;}
 

     if(PORTAbits.RA0 == 1 && PORTAbits.RA1 == 0 && PORTAbits.RA2 == 1) // counter clockwise
     {LATCbits.LATC0 = 0; LATCbits.LATC1 = 1;}
   
     if(PORTAbits.RA2 == 0) // motor stops
     {LATCbits.LATC0 = 0; LATCbits.LATC1 = 0;}
}
    
}

I'm sure it's obvious however what I want to do is: basically when button 1 is pressed and the others are not motor will run CW, when button 2 is pressed and the others are not go CCW and when third one's pushed the motor shall stop regardless of what direction it's spinning.

The program worked fine if I added some delays instead of those ifs. When I use the if's however the RC0 and RC1 stay in 0 forever no matter what buttons I press. Obviously I'm missing something very simple but I just can't figure out what.

Any help will be appreciated. Thank you for reading!

 

[Pommie]

Port A is setup as analogue. Try setting ADCON1 = 0x0f and CMCOM = 0x07.

Mike.

 

[Cantafford]

Port A is setup as analogue. Try setting ADCON1 = 0x0f and CMCOM = 0x07.

Mike.

Thank you! It works now!