USB link STM32 - EG915U


After several research attempts, I could not find what I was looking for. That’s why I am posting this message today. I need to connect my microcontroller (STM32L4R9AI) to an EG915U modem through USB.

The microcontroller uses the latest HOST USB library which is compatible with all USB classes. However, it cannot detect any interface to send AT commands. I can detect the VID (0x2C7C) and PID (0x901) of the module.

For your information, I was able to communicate with another eval board with the CDC Class using this library. Have you ever completed this kind of project? Do you have any tips to help me?

Thank you."

If you’re running Linux on this board start with the basics: cat /sys/kernel/debug/usb/devices

Hello Jfrog,

Thank you for your reply.
I don’t use any operating system on my STM32, I develop in the C language.