you can search for 0xfff in the kernel tree. For example the cs8900 ethernet
controller has some code for the sleep pin, which is an external i/o pin.
Don't worry about i/o pins, you almost have to make sure that you don't
change the chip selects pins. Read the adress, and/or only the bits you
want to change and write it back. If you're worried to put to outputs together
by fault, just put a 10k resistor in between and measure the voltage across it.
Am Fre, 26 Jan 2001 schrieben Sie:
> > Programming the I/O pins is fairly easy, just look at the Dragonball
> > user's manual. You can even access these from an application program,
> > though that's not recommended. Please note, however, you don't have
> > access to some of the I/O pins of the Dragonball on the uCsimm
> > connector.
> I supose all my questions are covered inside the user manual. Is there any
> open source project that uses this thing ? Anything that interfaces with the
> outside world trhough the I/O pins. I kind of like to see the experiences
> others had before proceeding. They always have a lenghty explanation on what
> they faced and how they solved which it i find quite informative.
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