Bonjour @mwalt.3
Even if you set the data direction to receive only, you still need both pins on the STM32CubeMX. The only way to use just 1 pin is to set the mode to half duplex and set data direction to receive only. This will keep only 1 pin (the TX pin will do both TX and RX).
Best Regards.
STTwo-32
Best Regards.
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