Question about ports....pic18f4520

[kam]

Hi all,

Just a question....

I've written code to run an OLED LCD display. It all works fine using SPI bitbanging code etc...life is good.

I have the pins mapped to "C0~C5" and "A5"

Life is good.

NOW, when I move the pins to lets say "D0~D6", nada, nothing. Actually, I get display errors on the screen.

Now my question is, looking at the spec for the pic18f4520, the ports on "C" are mapped as "Digital I/O - SP", and so are the ones on Port D. I have disabled PSP.

Whats the difference? Is there any? Why would the same code but different pins make a difference is they are both "Digital I/O-SP"???

Any thoughts, advice, sharp poke in the eye, enlightenment, etc would be greatly appriciated!

BTW, I am prototyping on the CCS Software Proto Board...


~Kam (^8*

[PCM programmer]

The first thing would be to check the connections. Make sure you don't
have some pins swapped.

Next, if you're using set_tris_a() and set_tris_c(), make sure you change
them to set_tris_d() for the LCD code.