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Problems with data reception via USART3 on STM32F429-Disco board

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Original post: https://community.st.com/t5/stm32cubemx-mcus/problems-with-data-reception-via-usart2-on-stm32f429zi/td-p/741765

Even setting USART3 it doesn't work (see attachments). Did I make a mistake setting some parameters, or is something missing? Thanks a lot

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mƎALLEmBest answer

ST Technical Moderator

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:

From F429-DISCO schematics:

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.

mƎALLEm

ST Technical Moderator

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.

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E

Emanuele78Author

Associate II

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 */
 }

Myproject_PULSANTEeLED.ioc

mƎALLEmBest answer

ST Technical Moderator

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:

From F429-DISCO schematics:

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

Super User

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

ST Technical Moderator

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

ST Technical Moderator

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

Yes, sorry..

Andrew Neil

Super User

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

Super User

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

Super User

@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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