ejrob
Posts: 3
Joined: Wed Oct 05, 2011 11:06 pm
Contact: Website

Re: Max number of GPIO (by repurposing special function pins)

Fri Feb 17, 2012 10:27 pm

Hopefully this hasn't already been asked, but what is the maximum number of GPIO pins that can be utilized on a current Raspberry Pi board? I know that there are 8 of them by default, and I've also read that it is possible to repurpose some of the special function pins to become GPIO.  Unfortunately for the time being, there doesn't appear to be any more information about this process, or any limitations that might need to be considered when pursuing it.

I'm asking because of a potential project that would involve attaching this LED video panel to a Raspberry PI, but the panel requires 12 data pins. Ideally I would like to control the panel directly from the RPi, without extra circuitry.

arm2
Posts: 253
Joined: Thu Dec 15, 2011 3:46 pm

Re: Max number of GPIO (by repurposing special function pins)

Sat Feb 18, 2012 3:03 pm

The answer can be found in the Data Sheet and what Gert posted on the 15th Feb in the thread you mentioned.

ejrob
Posts: 3
Joined: Wed Oct 05, 2011 11:06 pm
Contact: Website

Re: Max number of GPIO (by repurposing special function pins)

Sun Feb 19, 2012 5:26 pm

Thanks for pointing that out. I didn't read the later posts too closely and mistook that as specific to the gertboard itself.

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