USB Dual-Role (Host + Device) support on U585I-IOT02A — example for firmware upgrade

[Vinay_Shirol]

Hi team,

I am working on the STM32U585I-IOT02A board and trying to implement USB dual-role functionality (Host + Device).

My goal is:

• USB Host: MSC class (to read firmware from a USB flash drive)

• USB Device: CDC class (for communication with a PC)

I have enabled both the USB Host stack and USB Device stack in CubeMX, but I am unable to get the dual-role setup working reliably.

My main objective is to upgrade firmware using a USB flash drive (MSC Host) while still supporting CDC Device communication.

I would like to know:

1. Does STM32U5 support USB dual-role operation (Host + Device) simultaneously or via role switching?

2. Is there any example project or reference implementation for USB dual-role on STM32U5?

3. Are there recommended approaches for implementing firmware upgrade via USB MSC Host on this board?

Any guidance or example projects would be very helpful.

Thank you.

[Gyessine]

Hello @Vinay_Shirol 
Although there is unfortunately no example that meets your specific requirements, I have a project that switches between two device class functionalities on an STM32U585 IoT kit.
The project starts as a HID device, then switches to the CDC device class after five seconds. you can use USB tree viewer to track the switch
You can use this project as a reference to fulfill your request.
However, since you want to implement both device and host functionality at the same time, you should select OTG_Dual_Role_Device option so you can select host files in your project alongside device files.

You can also review this article, where we implemented dual-role data functionality on the STM32H7 (HID host and CDC device) but with using ST middleware, not USBX. In this example, we manually implemented device files.
BR
Gyessine

[Vinay_Shirol]

Thanks @Gyessine , 

                                I will go though this article and try it on my board. I will update here whatever the status of this later.