SPI3 issue NUCLEO-H7S3L8 (PC11 pin)

[Dziubasku]

Hi, I have a problem configuring SPI3 on a NUCLEO-H7S3L8 board.

I’m writing directly to registers and not using any ready-made functions. I configured SPI3 and everything works correctly as long as I use PB4 as MISO. However, I wanted to use PC11 instead, and then I only read 0xFF.

I’m using exactly the same settings for PC11 as for PB4, and both are configured with AF6.

My question is: does PC11 require any special configuration, or maybe something on the Nucleo board blocks it from being used this way?

[mƎALLEm]

Hello,

Nothing special from NUCLEO board side. PC11 is exposed to both connectors and nothing already connected to it on the board according to its schematic.

What I suggest is to:

1- Start by toggling PC11 and check if it is toggling as intended.

2- Check if you already enabled RCC clock of PC port.

3- Check if you've selected the correct alienate function for SPI3_MISO on PC11. Did you select AF6? (you said you did it but please check):

[Andrew Neil]

Have you used an oscilloscope and/or logic analyser to see what's actually happening on the wires?

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@Dziubasku wrote:

I’m writing directly to registers and not using any ready-made functions. ?

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So have you tried doing it via CubeMX ?

If the behaviour remains the same, that would rule-out any issues in your code.