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STM32 UART connecting RxD and TxD pin (pin, not internl line)

Question asked by Juergen Marquardt on Jun 6, 2017
Latest reply on Jun 8, 2017 by Clive One

Hi, want to build a "uart daisy chain" with several (up to 200) STM32 MCUs by connecting TxD of uart number n to RxD of uart number n+1 (1-wire connection). To perform Initial addressing Job I'm thinking to do it like the old TMP104 (temperature sensor of TI) did. For this I would need to get RxD and TxD pin of UART of STM32 be connected/disconnected.
I am aware of the "half duplex mode" (HDSEL:=1). But this mode is not useable, as it disconnects the RxD pin.
Any way to get RxD and TxD connected and disconnected by software (without additional hardware external to STM32? Best regards, Juergen.