Need CDC-ACM (libusb, HS) Sample, Without UART for STM32U5 – For Real-Time DCMI Data.

[saikumar]

 

Hi ST Community,

I'm working with the STM32U5G9ZJT6Q and need to send real-time data from DCMI over USB through CDC . I generated a CDC-ACM project using CubeMX 6.14.0, and by default, it appears as a Virtual COM Port under device manager . Then i used Zadig to replace the driver with libusb-win32, and now the device shows up under libusb devices, ready for high-speed (HS) USB communication.

However, all CDC-ACM examples I’ve found using with UART, which doesn’t meet the performance needs for my video streaming use case.

I’m requesting a sample project or reference code using the STM32U5 USB stack, where CDC-ACM works with libusb (HS mode) and does not rely on UART, so I can send DCMI data directly over USB.

thanks,

[FBL]

Hi @saikumar 

 

While we can't provide a specific example for every request, we can assist you in customizing your project using reference board STM32U5G9J-DK2. Start with this example provided for CDC interface and let us assist you troubleshooting issues. Consider sharing minimum project so we can identify the specific problem you're encountering.

[FBL]

Hello @saikumar 

This example uses classic middleware on STM32U5. If you consider using USBX stack, I recommend this example. I'm not sure which driver (lib_usb) will it point.

• On one side, the STM32 exchanges data with a PC host through USB CDC interface in Device mode.
• On the other side, the STM32 exchanges data with ST-LINK MCU through UART which could be customized according to your specific requirements.

[saikumar]

hello, mr @FBL 

Actually, I have the same requirement as mentioned in this post:

"https://community.st.com/t5/stm32-mcus-embedded-software/how-to-implement-winusb-instead-of-cdc-acm-on-stm32u5-series-mcu/m-p/805629#M63864"

In your reply, you mentioned that we need to use  "https://github.com/STMicroelectronics/stm32u5-classic-coremw-apps/tree/main " .

 

I would like to ask :- instead of requiring a total stack change, is it not possible to update the existing STM32U5 series USB device stack to support WinUSB functionality directly?

This would help a lot , who are already using the default USB stack generated by STM32CubeMX for STM32U5 and want to use WinUSB without major modifications.

Looking forward to your input.

Thanks.