stm32/usart: configurable readback for half-duplex to support 1-wire + ds18b20 example #3679
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The 1-Wire bus requires the ability to read data while transmission is in progress to detect if a sensor pulls the bus to a low level (logic 0).
This pull request adds a new enum
HalfDuplexReadbackwithReadbackvariant that keeps receiver enabled during transmission. Half duplex can be newly created withBufferedUart(#3278). A simplified example, based on the RP example, has been added to demonstrate how to use this feature with the DS18B20 temperature sensor.