Communication between Nucleo-F411RE and Raspberry Pi using ST-Link VCP

[suhfi]

Hello, i am using STM32F411RE with raspberry pi 4. i want to communicate rasp with stm32 through usb cable from pi to CN1 of stm32. i want the communication both ways. could you please tell me how to do it?
Thank you in advance.

[Andrew Neil]

You need to give more details:

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

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@suhfi wrote:

CN1 of stm32.

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STM32 is just the microcontroller chip - it has no CN1

Are you talking about a Nucleo-F411RE board ?

https://www.st.com/en/evaluation-tools/nucleo-f411re.html

In which case CN1 is the ST-Link connector.

So you're wanting to use the ST-Link's VCP (Virtual COM Port) for UART communication with your RPi?

https://www.st.com/resource/en/user_manual/um1724-stm32-nucleo64-boards-mb1136-stmicroelectronics.pdf#page=25

Does the ST-Link's VCP show up on the RPi when you plug it in?

[SofLit]

Hello @suhfi ,

The title needs to provide a summury of your request. Putting "Communication" as a title doesn't give a clear information about your request. The title needs also to be concise. I'm updating your title then ..

I invite you to read these tips on how to post in this community.

Thank you for your understanding.

[Andrew Neil]

On using a direct UART connection:

https://community.st.com/t5/stm32-mcus-products/uart-transmission-and-reception-between-stm32-nucleo-64-and/td-p/213120

Or use a USB-to-UART converter ?

[suhfi]

yes, i want to know how to do the communication between stm32f411re and raspberry pi 4 using usb cable connected to raspberry pi 4 and CN1 of stm32f411re. how can i do that.
i have seen many blogs but none of them are clear how to do thatt.

i want two way communication between them.

[SofLit]

You need that Raspberry detects your STLINK as VCP (Virtual Comport).

So it's a Linux stuff not related to the STM32:

So to me the subject is more: "How to detect and use Serial Ports under Linux"

See these links:

https://www.cyberciti.biz/faq/find-out-linux-serial-ports-with-setserial/

https://thelinuxforum.com/articles/752-how-to-list-serial-ports-on-linux

...

I think you need to get something like: ttyUSB

[Andrew Neil]

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@suhfi wrote:

 CN1 of stm32f411re. .

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Again, stm32f411re is just the MCU chip - it has no CN1.

https://www.st.com/en/microcontrollers-microprocessors/stm32f411re.html 

These are chips:

So are you talking about a Nucleo-F411RE board ?

https://www.st.com/en/evaluation-tools/nucleo-f411re.html 

To clarify, the chip is highlighted in red; the board in blue:

https://community.st.com/t5/stm32-mcus-boards-and-hardware/nucleo-stm32f303k8-pa3-pin-doesn-t-work-for-uart-receive/m-p/690491/highlight/true#M19880

PS:

Another example:

https://community.st.com/t5/stm32-mcus-products/diffrence-between-stm32f29i-disc1-and-stm32f429zi/m-p/745107/highlight/true#M266845

#BoardVsChip #ChipVsBoard

[Andrew Neil]

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@SofLit wrote:

You need that Raspberry detects your STLINK as VCP (Virtual Comport).

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Exactly.

Do you know if an ST-Link's VCP should "just work" on Linux (and on RPi Linux, in particular)?

[suhfi]

so i have enabled communication device class, and wrote the code for transmitting. but when i connect in Teraterm, i am not able to see the transmitted message. the stm32f411re isn't sending the message. i tried debugging the code and i can see the data that is sent is blank, that means stm32 isn't sending the data. 

[SofLit]

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@Andrew Neil wrote:

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Do you know if an ST-Link's VCP should "just work" on Linux (and on RPi Linux, in particular)?

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I think it could.. It's detected on windows as VCP I don't see any reason why it won't be detected on Linux.