1. Enumeration sequence
1.Get_Descriptor (Device) through default address
2.Set_Address through default address
3.Get_Descriptor (Device) through assigned address
4.Get_Descriptor (Configuration , 9 bytes) through assigned address
5.Get_Descriptor(String) through assigned address
6.Get_Descriptor (Configuration, include all subordinate descriptors)
through assigned address
7.Set_Configuration through assigned address
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