Connection between RM520N-GL and STM32H7S3

IoT Modules 5G Module
1

Hello,

I’m working with the RM520N-GL module and trying to connect it over USB to a STM32H7S3L8H6H acting as USB Host.

I expected the module to expose a CDC class interface, but after setting AT+QCFG=“usbnet”,1, it still enumerates with USB class 0xFF (vendor specific).

I would like to ask if there is a way to use the RM520N-GL over USB with standard USB classes that a microcontroller USB Host stack can recognize.

If not, is there any documentation or example available on how to implement a custom USB Host driver to support the RM520N-GL’s current USB interface?

Thanks in advance.

2

Dear @andgarriv
Actually, STM32 is host, RM520NGL is salve, we don’t have USB host driver, you can check whether STM32 has it.

3

Thank you very much for your reply.

Yes, the STM32H7 I’m using does include a USB Host stack and supports the CDC class.

My question is:
Is there a way to configure the RM520N-GL so that the AT command port enumerates as a standard CDC ACM interface, instead of a vendor-specific class (0xFF)?

That would allow me to use it directly with the existing STM32 USB Host CDC driver without needing to implement a custom host class.

Thanks again.

4

Dear @andgarriv
It depends on the driver in host not module side.