请问圈圈：
D12上电后，USB枚举怎么是这样的呢？
为何返回设备描述符后，收到电脑的清除特性的包呢？
以下为51串口输出内容：
Usb_suspend.
Usb_reset.
Usb_end0_out.
8006000100004000
Usb_get_device_descriptor.
Usb_device_descriptor_send_complete.
Usb_end0_out.
1201100100000010
Usb_clr_feature.
Usb_end0_out.
1201100100000010
Usb_clr_feature.
Usb_end0_out.
1201100100000010
Usb_clr_feature.
Usb_end0_out.
1201100100000010
Usb_clr_feature.
Usb_end0_out.
.......
....... |
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