STM32H7A3 USB_OTG_FS

comer · ‎2025-04-09

Hi,

I am using the STM32H7A3 board to implement the virtual serial port function for USB, and I want to use FS mode. However, there is no macro definition related to FS mode in STM32H7a3xx. h. Do I need to manually add it? And I checked the demo in the development package, but there is no demo of H7A3 regarding the virtual serial port. Can you provide it? Currently, I am referring to the USB virtual serial port demo of stm32H743l for porting, following the HS mode, but the computer does not recognize the USB interface.

Andrew Neil · ‎2025-04-10

That doesn't tell us much - Please give a link.

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.

View solution in original post

Andrew Neil · ‎2025-04-09

Welcome to the forum.

Please see How to write your question to maximize your chances to find a solution for best results.

@comer wrote:
I am using the STM32H7A3 board

Which STM32H7A3 board ?

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.

comer · ‎2025-04-09

It's not an official development board, it's the smallest system board I bought online

Andrew Neil · ‎2025-04-10

That doesn't tell us much - Please give a link.

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.

comer · ‎2025-04-10

hi ,andrew neil

The important thing is not this development board, but the USB code generated by CubeIDE when I use the STM32H7A3 chip for development the configuration related to FS, whether this chip can be configured into FS mode?

Andrew Neil · ‎2025-04-11

@comer wrote:
The important thing is not this development board

So why have you marked that post as the solution? Clearly is isn't!

To unmark, see: 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

@comer wrote:
The important thing is not this development board, but the USB code generated by CubeIDE

Note true: The hardware needs to be correct as well as the software!

Embedded software works in the context of the hardware - it can't be considered in isolation - so it's important to know that context.

@comer wrote:
whether this chip can be configured into FS mode?

That would be answered in the datasheet.

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.

Pavel A. · ‎2025-04-11

STM32H7A/B have only one USB controller (per the documentation, I don't have these boards) and it is named "HS".

For example see here. This is why _FS macros are not defined for this product - just by arbitrary convention.