Driving me NUTS!

[PaulJC]

Im no expert (far from it lol) but i don't think that "PORTB = PORTD" would work.

I would try something like:

Loop:
IF PortD.0 = 1 Then PortB.0 = 1
IF PortD.1 = 1 Then PortB.1 = 1
IF PortD.2 = 1 Then PortB.2 = 1
IF PortD.3 = 1 Then PortB.3 = 1
Goto Loop


Cheers Paul

[muddy0409]

Thanks for the suggestion Paul.
Just tried that but still no go.
It appears that the loop is looping, just that the portD input data is not being read into wherever it is supposed to go, unless I reset the chip.

Bloody frustrating, ain't it???

[PaulJC]

Bloody frustrating, ain't it???

Yep lol.

Do you have the datasheet for your switch?

[peterdeco1]

Hi Muddy. I am not at all familiar with the PIC you are using except I read a post by someone who had PORTD problems and fixed them with setting the ADCON1 and ADCON2 registers.

[HenrikOlsson]

Hi Muddy,
First make a short loop blinking the LED's on PORTB to make sure they work and that the port is set up correct. (Which they seem to be since it reflects changes on reset).

For i = 1 to 5
  PortB = %00001111
  Pause 200
  PortB = %00000000
Next

Then try to read PortD to a variable first and then write that variable to PortD.

Switch VAR Byte
Loop:
  Switch = PortD                 'Read PortD, store in Switch
  PortB = Switch                 'Write switch to PortB
  Pause 10                         'Wait 10mS
Goto Loop                          'Do it again.

How about that, does that work?

/Henrik Olsson. (At work, no board to test with here.)

[muddy0409]

Gooday Henrik.
Tried that along the way back from final code back to the simplified code described above. No, it doesn't work.

Peter

[muddy0409]

Thanks to everyone who made suggestions. But I RTFM and came up with the answer, which just may help someone else.....
PORTD is also the PARALLEL SLAVE PORT. To make it a general purpose I/O port, Bit4 of TRISE must be set to 0 IE TRISE.4 = 0

Did that and now seems to be OK. Will spend the next few hours reverting to the final code and see what happens.


Peter Moritz.