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MChap.1
MChap.1
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Jan 17, 2021 2:59 AM UTC
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What pins are available for GPIO on STM32F429I-DISCO?

My initial thought was that while some pins are connected to other peripherals on the discovery board, that they may still be used for GPIO. Is this true, or can a pin not be used for GPIO if connected to a peripheral, even if that peripheral is not used (e.g. SDRAM, gyroscope, etc.).

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TDK
TDKBest answer
Jan 17, 2021 4:02 AM UTC

It depends on the peripheral. Generally a pin can be used unless an external peripheral is trying to drive it, and in order to make sure the peripheral doesn't talk, you may need to hold a pin in a certain state. I think all peripherals are okay with 3.3V inputs, so shouldn't be a conflict there. The user manual generally lists the conflicts for individual pins.

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TDK
TDKBest answer
Jan 17, 2021 4:02 AM UTC

It depends on the peripheral. Generally a pin can be used unless an external peripheral is trying to drive it, and in order to make sure the peripheral doesn't talk, you may need to hold a pin in a certain state. I think all peripherals are okay with 3.3V inputs, so shouldn't be a conflict there. The user manual generally lists the conflicts for individual pins.

"If you feel a post has answered your question, please click ""Accept as Solution""."
MChap.1
MChap.1Author
Associate
Jan 17, 2021 5:59 AM UTC

That makes a lot of sense. I did see that portion of the manual, so it's mainly a matter of determining which pins are peripheral outputs and how to keep the peripheral from talking. I do need some 5V tolerant pins, but I believe there are enough pins that aren't used with peripherals that I should be fine. Thanks!

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