STM32H735G-DK STMOD+ Pin4 as GPIO

[gila2025]

Hello,

I will need some help to determine if STM32H735G-DK STMOD+ connector Pin 4 SCK/RTS can be configured as a GPIO pin. Not sure which port is mapped to this pin as I will need to control this pin as a GPIO.

Thanks.

[Andrew Neil]

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@gila2025 wrote:

Not sure which port is mapped to this pin .

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The schematics, as always, are on the 'CAD Resources' tab of the board's Product Page:

https://www.st.com/en/evaluation-tools/stm32h735g-dk.html#cad-resources

Also check out the User Manual - available on the 'Documentation' tab:

https://www.st.com/en/evaluation-tools/stm32h735g-dk.html#documentation

[mfgkw]

According to UM2679 (https://www.st.com/resource/en/user_manual/um2679-discovery-kit-with-stm32h735ig-mcu-stmicroelectronics.pdf, "8.4 P2 STMod+ connector") the wiring of some pins on STMod+ depends on solder bridges.
Pin4 is routed via SB6 (default: closed) to PF8 and via SB7 (default: open) to PF7.
So with an unmodified DK pin 4 can be used as GPIO PF8 (if not used as U(S)ART7_RTS). Opening SB6 and closing SB7 moves pin4 to GPIO PF7 (alias SPI5_SCK).

(Table 15 in UM2679 is a bit misleading since the default configuration for pins 1 through 4 is not mentioned first but second.)