NUCLEO-H753ZI: Communication with PC

doronzzz · ‎2025-03-06

I'm trying to use my NUCLEO-H753ZI board to send some message to my PC using UART. I read from the data sheet that USART3 is connected to the ST-LINK for the Virtual COM Port (VCP), and USART3 can directly transmit messages to the PC. However, in the configuration window, USART3 is greyed out and cannot be configured. Is this normal? If so, how can I send messages to my PC using this board?

mƎALLEm · ‎2025-03-06

Hello @doronzzz and welcome to the community.

Because it is already configured in the Bsp and the code is already generated by CubeMx:

And you've selected to configure the VCP at the creation of the project based on the board:

Hope that answers your question

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

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mƎALLEm · ‎2025-03-06

Hello @doronzzz and welcome to the community.

Because it is already configured in the Bsp and the code is already generated by CubeMx:

And you've selected to configure the VCP at the creation of the project based on the board:

Hope that answers your question

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

doronzzz · ‎2025-03-06

The RX and TX pins of USART3 says they are under BSP control. Is this the reason why USART3 is unavailable?

mƎALLEm · ‎2025-03-06

Yes.

If you uncheck the "Virtual Com Port" check box option, USART3 will be available again.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.