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Best answer by mƎALLEm

Please refer to the thread I provided to you (there is an example of printf attached): https://community.st.com/t5/stm32-mcus-embedded-software/how-to-use-printf/m-p/736985#M56462

F429-DISCO is using USART1 connected to VCP:

From the user manual of the board:

SofLit_1-1731409358224.png

From F429-DISCO schematics:

SofLit_0-1731409235084.png

Hope it helps.

 

14 replies

mƎALLEm
mƎALLEm
ST Technical Moderator
November 12, 2024

The attachments are not helpful. Normally you need to share your code and attach your ioc file.

Meanwhile, you can use this example already running on STM32F429ZI-Nucleo board:

https://github.com/STMicroelectronics/STM32CubeF4/tree/master/Projects/STM32F429ZI-Nucleo/Examples/UART/UART_Printf

Hope it helps.

To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
    E
    Emanuele78Author
    Associate II
    November 12, 2024

    Given that I am using the STM32F429ZIT6 DISCOVERY KIT connected to the PC via USB, from the received messages I didn’t understand whether I should use USART3 or USART1. I tried following the instructions, but it doesn’t work.

    Ok, the code in main.c is very simple:

    /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
 if(HAL_GPIO_ReadPin(Pulsante_on_board_GPIO_Port, Pulsante_on_board_Pin))
 {
 stato = !stato;
 HAL_Delay(250);
 }

 HAL_GPIO_WritePin(Led_on_board_LD3_GPIO_Port, Led_on_board_LD3_Pin, stato);

 if(HAL_UART_Transmit(&huart3, (const uint8_t *)"TEST ", 6, 100) !=HAL_OK)
		 Error_Handler();
 HAL_Delay(500);
 /* USER CODE END WHILE */

 /* USER CODE BEGIN 3 */
 }

     

    mƎALLEm
    mƎALLEmBest answer
    ST Technical Moderator
    November 12, 2024

    Please refer to the thread I provided to you (there is an example of printf attached): https://community.st.com/t5/stm32-mcus-embedded-software/how-to-use-printf/m-p/736985#M56462

    F429-DISCO is using USART1 connected to VCP:

    From the user manual of the board:

    SofLit_1-1731409358224.png

    From F429-DISCO schematics:

    SofLit_0-1731409235084.png

    Hope it helps.

     

    To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
      Andrew Neil
      Andrew Neil
      Super User
      November 12, 2024

      See the Posting Tips for how to properly post source code:

      https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

      A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
      mƎALLEm
      mƎALLEm
      ST Technical Moderator
      November 12, 2024

      I noticed you are using F429 disco board that it is using USART1.

      See the example I attached in this thread.

      As stated by @Andrew Neil you need to share the code + provide which HW you are using, ST board? Custom board? this prevents us to provide you wrong answers.

       

      To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
        mƎALLEm
        mƎALLEm
        ST Technical Moderator
        November 12, 2024

        Hello @Emanuele78 , did you mistakenly accept the wrong comment as solution ?

        To give better visibility on the answered topics, please click "Best answer" on the reply which solved your issue or answered your question.
        E
        Emanuele78Author
        Associate II
        November 12, 2024

        Yes, sorry..

        Andrew Neil
        Andrew Neil
        Super User
        November 12, 2024

        Instructions to undo that:

        https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256#:~:text=If%20you%20accidentally%20chose%20the%20wrong%20post%20as%20solution%2C%20you%20can%20always%20revert%20this%20action%20by%20clicking%20%22Not%20the%20Solution%22

         

        A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
        waclawek.jan
        waclawek.jan
        Super User
        November 12, 2024

        Is this a new board?

        Because older revisions (B01) of it did not have the VCP capability.

        Revision should be displayed on a sticker on the bottom of the board.

        JW

          Andrew Neil
          Andrew Neil
          Super User
          November 20, 2024
          @waclawek.jan wrote:

          older revisions (B01) of it did not have the VCP capability.

          I guess that's why it's not shown on the block diagram - it was just copied without being updated?

          A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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