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Mar 7, 2014 at 4:53 comment added Passerby @user33573 the signals are "usb enumeration". That's what it is called. An adapter would be a usb breakout, and you would connect the d+ and d- to individual channels of a logic probe or oscilloscope, or if you have a couple hundred to spare, a usb logic analyzer. As for replicating enumeration on a MCU, that requires creating a USB HOST for usb composite devices and usb hid devices. A MCU with hardware USB Host support would be your best bet.
Mar 7, 2014 at 2:57 comment added user33573 What signals are sent to the Xbox controller during enumeration that allows the controller to stay on? Would this require reverse engineering to figure out? If so is there a known USB adapter device that has leads sticking out allowing for signal interception? When the exact wave forms of the signals are identified, should it not be a trivial task to replicate said signals with a MCU?
Mar 6, 2014 at 11:57 history answered Passerby CC BY-SA 3.0