How to enable USART driver in CubeMX?

[HF.Wang]

The code generated by the STM32CubeMX is using the UART rather than the USART.

How do we generate the code using the USART driver lib via the CubeMX?

[HF.Wang]

Using the STM32L412 with the latest CubMx and Lib.

[Karl Yamashita]

It's the same driver for both types

[Guenael Cadier · Accepted solution]

Hi @Community member​ 

USART1, USART2, ... and/or UART4 or UART5, ... are instances of peripherals, able to achieve UART/USART communications.

Usually, USARTx instances are able to handle :

- UART comms : Asynchronous communication, no CLK signal

- USART comms : Synchronous, based on a CLK signal

while UARTy instances only handle :

- UART comms : Asynchronous communication, no CLK signal

So depending on what type of communication you want to handle, you need to select the appropriate type in CubeMx configuration :

"Asynchronous" => Use of HAL UART API, UART comm type

"Synchronous" => Use of HAL USART API, USART comm type

 

Hope this answers your question

Regards

[HF.Wang]

Thanks. Got it. That mean the USART only be used when the synchronous mode selected. If the only asynchronous mode used, the CubeMX will only use the UART lib.