NUCLEO - H753ZI - USB Host with HUB - Stm32CubeMX

[MoGrunwalski]

Hello,

I am trying to use the USB HOST with CubeMX, everything works fine and I can detect my USB stick properly. The connection/disconnection is detected correctly.

Then, I tested connecting a UGREEN SD card reader, and everything works fine as long as I insert only one SD card. However, when I insert the second SD card into the card reader, CubeMX does not detect the second connection and only considers the first connection.

Similarly, when I connect a powered USB hub (Meta 7-Port USB 2.0 Hub), it detects the USB but never goes into "APPLICATION READY"...?

My question is the following: is it possible to use the USB Host with CubeMX to control a USB hub and read and write to multiple USB sticks?

I haven’t found any example on GitHub.

Thank you for reading!

[FBL]

Hi @MoGrunwalski & welcome to ST Community

Maybe this example should be helpful

STM32CubeH7/Projects/NUCLEO-H723ZG/Applications/USB_Host/MSC_Standalone at master · STMicroelectronics/STM32CubeH7

even though not sure if that would be possible to use multiple USB sticks. Which product are you using? If having issues, would you attach ioc file?

[MoGrunwalski]

Hi @FBL 

I just saw your example, but nothing seems to resemble the ability to control a USB hub with the USB Host. Here is my .ioc file attached.

 

[Pavel A.]

Yes this may be possible, with good USB libraries that support hubs.

Regarding the UREEN reader - if you connect it with two cards to a PC, will the PC see both cards? If yes, does PC see the reader as USB composite device with two functions, or one device/function with two LUNs?

 

 

[MoGrunwalski]

 

Hi @Pavel A. 

Isn't this kind of library managed and defined directly with the code generated by STM32CubeMX?
Regarding the UGREEN card reader, the PC sees a device with two LUNs. I find my two distinct disks in the disk manager (E:) and (G:), and in the task manager, I see "Generic MassStorageClass USB Device" listed twice

 

Thank you 

[Pavel A.]

Hi @MoGrunwalski , maybe one device with two LUNs will be possible to implement with the existing ST USB library, as it does not require composite or hub support or other complications on the USB level.

Some tweaking is needed in the MSC (mass storage) protocol layer. Unlikely that STM32CubeMX can help here.

 

 

[Pavel A.]

Multiple CDC (host) unfortunately requires a hub or composite.

Multiport serial adapters were popular many years ago, but AFAIK this kind of device has not made it to official usb.org standard. This is a pity because need for such devices still exists.