stm32mp157f-dk2 usb gadget

[WLeun.3]

Hi everyone,

I am using stm32mp157f-dk2 with ecosystem 3.1.

I want to configure the usb type C port(CN7) as serial port, and communicate with the host PC.

This article helps me a lot. https://wiki.st.com/stm32mpu/wiki/USB_overview#How_to_configure_USB_Gadget_through_configfs

I modified the usbotg-gadget-config.bb, the stm32_usbotg_eth_config.sh and create my own service, as attached.

After that, I can successfully set up the device. I can see ttyGS0 show up in my device.

However, when I connect it to the host, although the host is able to detect my device, it can't recognize my device.

What am I missing?

I suspect that it is the stlink causing the issue, as it occupy the ttyACM0 already and the host cannot create another tty corresponding to the GS0. I am not sure how will the host OS deal with this situation.

Regards,

Leung

10/3 update: I found that my PC can't boot up when the device is connected. It scared me. I am still investigating why it is failing, but I think the stlink is not the root cause.

[WLeun.3]

Do anyone have experience with the serial usb?

[Kevin HUBER]

Hello @WLeun.3​,

I will try to help you

Please can I have:

• Your complete Bootlog
• Your complete DTB file to verify the usbotg_hs configuration.

Regards,

Kevin

[WLeun.3 · Accepted solution]

Hi @Kevin HUBER​ ,

I have already fixed it. Setting USB_G_SERIAL=Y in kernel config solve my problem.

Anyway, thanks for your reply.

Regards,

Leung