rt1052 can not detect usb attach or detach

[1920844004]

As shown below code,my device rt1052 can not detect usb attach or detach,why?

project is: KSDK 2.4.0\boards\evkbimxrt1050\usb_examples\usb_device_hid_generic\bm\mdk

pay attention: #define USB_DEVICE_CONFIG_DETACH_ENABLE   1

[1920844004 · Accepted solution]

usb_otg_vbus should connect to USB 5V，otherwise can not detect usb attach or detach!