Remapping SPI pin

StanCosgrove · ‎2024-01-23

Hi i m using STM32H750XBH and i would like to remap SPI pin to the following pin out, i m using SPI3 full duplex master, HW NSS output, could anyone advise is this is feasible? Or i need to following the pin out from the standard H750 ioc pin arrangement?

PA4 - SPI3_NSS

PC10- SPI3_SCK

PC11 - SPI3_MISO

PC12 - SPI3_MOSI

TDK · ‎2024-01-23

Yes, you can manually select which pins are used. Enable SPI how you want it, then left click the pin you want and select the SPI3 mode.

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FBL · ‎2024-01-24

Hello @StanCosgrove

You need also to check the datasheet to refer to the correct alternate function.

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StanCosgrove · ‎2024-01-24

yes i checked, and found only PA4, PA15 and PE4 are viable for HW CS?

tjaekel · ‎2024-01-24

If the datasheet (not the reference manual with SW details, the HW datasheet with the pinmux table) "tells" you where you can "grab" a signal (on a pin, with an ALT function - it is pretty correct.

If you do not see that the same signal, e.g. SPI3_NSS is coming out on a different pin (via ALT setting) - you cannot "reroute" this signal to a different PIN ALTernative.