Lpc2000

--- In lpc2000@yahoogroups.com, "MattKav" <mkavalauskas@b...> wrote:
> I am trying to use P0.3 as a GPIO, but it doesn't seem to be
> working.
> I define the bit as:
> #define ADC_CS  (1 << 3)
> but it doesn't work.  If I change it to:
> #define ADC_CS  (1 << 19)
> I can toggle it just fine using the exact same code.  P0.2 does not
> work either.
> 
> I am not using the I2C, but I am using SPI.  I am using Timer0;
> however, I am not using the Match.
> 
> I have even tried forcing the pin to be GPIO using:
> PINSEL0 = PINSEL0 & 0xFFFFFF0F;
> but that doesn't work either.
> 
> Any suggestions?  (Besides swapping in P0.19 for P0.3.)

Maybe add pull-up resistors.
P0.2 and P0.3 can only work as inputs or open-drain outputs, not push-
pull outputs.  This is true even when they aren't configured as I2C.

Karl Olsen