~ruther/stm32h747i-disco-usb-image-viewer

ref: d0823eecd4dee0c7e2f3ee08534b89477526b6ad stm32h747i-disco-usb-image-viewer/src/usb_device.c -rw-r--r-- 3.0 KiB 
feat: add registers, pin, exti, usb_device skeleton