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STM32 Single Wire UART


A simple application demonstrating how to use the single wire / half-duplex UART functionality of STM32. Without adaptions this example runs on STM32F3 discovery board. You need to establish a physical connection between pins PA2 (USART2_TX) and PC10 (UART4_TX).

Add a single_wire_uart_loopback fixture to your board in the hardware map to allow twister to verify this sample’s output automatically.

Building and Running

Build and flash as follows, replacig stm32f3_disco with your board:

west build -b stm32f3_disco samples/drivers/uart/stm32/single_wire
west flash

After flashing the console output should not show any failure reports, but the following message repeated every 2s:

Received c