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Caan
Caan
Associate III
February 24, 2026
Solved

Custom STM32H750XB Board USB (Device mode- Virtual Com Port)

I have build a Fully pin compatible STM32H750B-DK board with USB Device only setup along with Touchgfx and Freertos , Touchgfx is displaying everything correctly but the USB Isn't responding , I have setup the USB OTG FS in Device Mode as shown in the attached Images.
PC is not detecting anything

Gyessine
GyessineBest answer
ST Technical Moderator
February 25, 2026

Hello @Caan 
There are several actions that you can take to troubleshoot the root cause of the issue.
First, test your project on a reference board as suggested by @TDK .
It is also advisable to isolate the USB component from TouchGFX when testing on both boards to determine whether the problem is due to a hardware implementation or a software issue.
If the USB functions correctly in isolation, test the entire project on both boards.Maybe TouchGFX is interfering with USB functionality.
BR
Gyessine

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
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2 replies

TDK
TDK
February 24, 2026

> Fully pin compatible STM32H750B-DK

Does the same code work on the STM32H750B-DK board?

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Gyessine
GyessineBest answer
ST Technical Moderator
February 25, 2026

Hello @Caan 
There are several actions that you can take to troubleshoot the root cause of the issue.
First, test your project on a reference board as suggested by @TDK .
It is also advisable to isolate the USB component from TouchGFX when testing on both boards to determine whether the problem is due to a hardware implementation or a software issue.
If the USB functions correctly in isolation, test the entire project on both boards.Maybe TouchGFX is interfering with USB functionality.
BR
Gyessine

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
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