Trying to watch all PORTB (actually only using pins 0 to 5, others are 
unused), but having difficulty with reading the port. It all works using 
MPLAB SIM.

The configuration includes:

#pragma config PBAD = DIG        //PORTB configured as digital
#pragma config CCP2MX = OFF    // RB3 pin is PORT

and

TRISA = 0b00000000;     // All PORTA Output
TRISB = 0b00111111;     //RB0 - RB5 INPUT, RB6 & RB7 are for programmer 
ADCON1 =   0b00111111;     // RA0, RA1, RA2, RA3, RA5, RB0, RB1, RB2, 
RB3 and RB4 are digital
TRISC = 0b00000000;        // All PORTC Output
INTCON2 =  0b00000000;    //Set PORTB Pullups to high

I have verified that all PORTB bits are high, unless, I pull a pin down 
by connecting to ground.

This works

if (PORTBbits.RB4 == 0)

but I want to check all bits!
and this doesn't work

if (PORTB != 0b11111111)

The rest of the "IF" is below:

    {   
        LATC = 0b00111111;   
        LATA = 0b00111111;
    }
    else
    {
        LATC = 0b00000000;
        LATA = 0b00000000;
    }

It would seem that if any one, or all PORTB pins went to 0 volts (they 
are using the weak internal pullups), then PORTB would not equal all 
bits =1.


The application is a TV remote control repeater, and I don't want to 
send a signal back to the originating room. PORTB will have a IR 
receiver in each room, an emitter at each piece of equipment. This is 
only to test the PCB board and the PIC, before getting into the issues 
of actually moving the signal around.
Probably something dumb, I missed. Help appreciated. :)
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist