UART Serial Monitor using VS Code, Linux, and ST-Link

Forum|Forum|1 year ago
January 13, 2025
5 replies
4314 views

I have an older STM32 Nucleo-F746ZG and I want to try and send some serial over the ST-Link. I am in Ubuntu with VS Code. I have successfully built the project and it appears to be running in debug mode. However when I try to connect and read the serial output via Screen, Putty or even the Serial Monitor extension nothing is showing up on the serial port. I have found the ST-Link is at /dev/ttyACM0 and I have added my user to the dialout group, but nothing shows up.

I am using UART2 in Asynchronous mode, added interrupt and using VS Code in debug mode. I suspect that this is OS related, but wanted to know if anyone had any suggestions on where to look.

I have done other projects with STM32-Nucleo and VS Code so I believe this is a simple error on my part related to the ST-Link usb in Linux.

Doug

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Best answer by Andrew Neil

@hdferguson3 wrote:
I am using UART2

Is that USART the one connected to the ST-Link ?

eg, https://community.st.com/t5/stm32-mcus-products/uart-doesn-t-work/m-p/759888/highlight/true#M270155

A

Andrew NeilAnswer

Super User

@hdferguson3 wrote:
I am using UART2

Is that USART the one connected to the ST-Link ?

eg, https://community.st.com/t5/stm32-mcus-products/uart-doesn-t-work/m-p/759888/highlight/true#M270155

H

hdferguson3Author

Visitor II

How can I determine that?

A

Andrew Neil

Super User

From the board's User Manual and/or Schematics - as illustrated in the linked post/thread

H

hdferguson3Author

Visitor II

Oops, let me swap to USART3 and try this again!!! I'll report back.

A

Andrew Neil

Super User

You said it's, "an older STM32 Nucleo-F746ZG" - does that mean it's previously been used by you and/or others?

If yes (especially if others have been using it), you'll need to check those solder bridges (SB4, SB5, SB6, SB7)

H

hdferguson3Author

Visitor II

Boom! That was it. I knew I had overlooked something simple. I followed a tutorial and looking back that didn't overly make clear which USART they picked an why. So, make sure you know which USART to use and why.

Thanks!