STM32L412C8 USART2 RX TX pin swap not working

[KAsim]

I am using the STM32L412C8 and I am having trouble with the USART2 RX/TX pin swapping. I enabled it in CubeMX but if I send data to the PA2 pin (originally TX but should be RX after the swap) I get nothing. If however I send my data to PA3(should be TX after the swap) data instantly comes in. Checking the CR2 register of the USART, the SWAP bit is set.

What am I doing wrong?

[Uwe Bonnes]

Did you configure PA2 as peripheral?

[S.Ma]

Both pins should be alternate function configured. Otherwise, check the errata sheet.

[KAsim]

Yes, and I tried both push-pull and open drain.

[KAsim]

Both have been configured for USART2. The errata sheet has nothing relevant.

[S.Ma]

I've got STM32L4R5 connected to HC-06 BT module with wires, will give it a try tomorrow to check it at my desk.

[S.Ma]

Well it works on stm32l4r5. However, UE can t apparently be reset manually in debug mode.

[waclawek.jan]

OP's problem may also be the way how Rx is handled, regardless of the swap...

JW

[KAsim]

Would you mind sharing your code or the ioc file from CubeMX?

[KAsim]

What do you mean? I have used both HAL and LL functions to receive data and the result was the same.