Hi,
Unfortunately, we have only a simple example of FreeRtos, it does not include the usart example. But I think it is simple for you to add the Usart module.
As the following Figure, there are example for Both freertos and usart, I suggest you based on the frertos example to develop our own project, add the usart example, it is okay. You should note that the usart module interrupt level must be less than the Freertos switching interrupt priority.
In detail, pls the usart module interrupt priority level in IPRx register must be greater than 8, for example, you can select 15.
Hope it can help you
BR
XiangJun Rong

