Simple GPIO not working completely?!
I have a MCB2300 board and I'm playing around with simple GPIO input/output.
If I extend the blinky example from keil so that the P2.8 is also "blinking" it works, but if I want to expand it so that any pin from the P0 would blink or take input it doesn't work.
Also in the uVision debuger when I observe the Fast GPIO Port 0 and Fast GPIO Port 2 there is the difference where the P0 has FIO0PIN all set to 0 and FIO2PIN is all set to 1.
A little code I use:
from this the P2.8 works (pin 93 on LPC2378) but P0.10(pin69) and P0.11(pin70) don't change their state.
Am I missing something? I reviewed the MCB2300 schematics and I couldn't find anything connected to this pins so there shouldn't be any problems.
Any help would be appriciated as to why the P0 doesn't work for me.
--- In l..., "active_si" wrote:
> If I extend the blinky example from keil so that the P2.8 is also "blinking" it works, but if I want to expand it so that any pin from the P0 would blink or take input it doesn't work.
Do you set bit 0 in the SCS register?
While it's cleared (the default) you don't have access to port 0 and 1 through the fast I/O mode registers.
You need to enable Fast I/O on the legacy GPIO ports 0 and 1. Look at the
It's a gotcha every time... NXP should nuke those legacy ports.
Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
CrossWorks for ARM, MSP430, AVR, MAXQ, and now Cortex-M3 processors