USBX - Composite USB device - CDC ACM and MSC

[robertkau]

I'm trying to develop an application for the STM32H750 using USBX to implement two classes on the same USB device: CDC ACM and MSC. I've managed to get each one working individually, but I'm having trouble combining them. When I connect it to a PC, no driver is assigned to the CDC, although it's recognized as both a mass storage and communication device. Has anyone encountered this issue before? Is there any example I can use as a reference?

[Pavel A.]

> When I connect it to a PC, no driver is assigned to the CDC, although it's recognized as both a mass storage and communication device. 

Please post a screenshot how it looks in the  device manager. View -> Devices by container.

[FBL]

Hi @robertkau 

You can check this article using composite dual CDC HID device How to implement the USB device composite class in... - STMicroelectronics Community. You may simply need to redefine MSC class instead of HID class.