Questions about implementing custom USB device function, callback is not working

[2songh]

Environment
Zephyr Version: 3.4.99

Describe the bug
I implemented the USB callback in/out function by referring to the link.

• Link: https://docs.zephyrproject.org/latest/connectivity/usb/device/usb_device.html

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A folder was added under the zephyr/subsys/usb/device path.
Three files were added under the folder.

• CMakeLists.txt
  

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• Kconfig
  

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• core.c
  

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After that, I added USB-related configs to my project prj.conf file.

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When I built and flashed the project, USB worked fine.

When connected to a PC, a message is displayed including the configuration I added.

However, even if I try to generate an interrupt by sending a message to my board through the PC, no callback function is generated.

Please advise if I have made any mistakes or are lacking in this matter.

[jfischer-no]

You need to use usb_write() to arm/write-to an endpoint and when the transfer to the host is complete, the driver will call endpoint callback m2i_in_cb.

[2songh]

I'm already using usb_write() in m2i_in_cb.

Are there any problems in this part?

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Additionally, the dts file is missing from the main description, so it is added.