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STM32U545RE USART3 issue

Roshan_Anand
Associate

Hello

I am using STM32U545RE (LQFP64 package) for my project as master controller. I am using the following pins for USART3 along with a transceiver chip ADM3061E

Roshan_Anand_0-1703877183772.png

 

and an additional GPIO output configured to act as the Enable.

USART3_RX:PC5

USART3_TX:PC4

Enable:PB1

But on transmitting the data I am not getting any data on the output A,B pns(as in diagram).

But the same works with STM32L496RE uC, may I know what is the cause of this problem here?

 

On referring to the STM32U545xx Errata sheet, we got to know that the device that I use also has Z marking.

Is there a workaround available if the above problem is because of the untrimmed uC samples?

Regards

Roshan Anand

1 REPLY 1

What specific issue in the Errata are you worried about?  https://www.st.com/resource/en/errata_sheet/es0587-stm32u535xx-and-stm32u545xx-device-errata-stmicroelectronics.pdf

Put a pull-up on the RX pin, or enable internally.

Double check RCC clocks for GPIO and USART3. Check USART3 registers. Check HSE_VALUE

Check that the USART isn't flagging any sticky error that needs to be cleared.

Do you see data on the TX pin? Which pins?

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