boot.py

import usb_hid


# This is only one example of a gamepad report descriptor,
# and may not suit your needs.
GAMEPAD_REPORT_DESCRIPTOR = bytes(
    (
        0x05,
        0x01,  # Usage Page (Generic Desktop Ctrls)
        0x09,
        0x05,  # Usage (Game Pad)
        0xA1,
        0x01,  # Collection (Application)
        0x85,
        0x04,  #   Report ID (4)
        0x05,
        0x09,  #   Usage Page (Button)
        0x19,
        0x01,  #   Usage Minimum (Button 1)
        0x29,
        0x10,  #   Usage Maximum (Button 16)
        0x15,
        0x00,  #   Logical Minimum (0)
        0x25,
        0x01,  #   Logical Maximum (1)
        0x75,
        0x01,  #   Report Size (1)
        0x95,
        0x10,  #   Report Count (16)
        0x81,
        0x02,  #   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
        0x05,
        0x01,  #   Usage Page (Generic Desktop Ctrls)
        0x15,
        0x81,  #   Logical Minimum (-127)
        0x25,
        0x7F,  #   Logical Maximum (127)
        0x09,
        0x30,  #   Usage (X)
        0x09,
        0x31,  #   Usage (Y)
        0x09,
        0x32,  #   Usage (Z)
        0x09,
        0x35,  #   Usage (Rz)
        0x75,
        0x08,  #   Report Size (8)
        0x95,
        0x04,  #   Report Count (4)
        0x81,
        0x02,  #   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
        0xC0,  # End Collection
    )
)

gamepad = usb_hid.Device(
    report_descriptor=GAMEPAD_REPORT_DESCRIPTOR,
    usage_page=0x1,  # Generic Desktop Control
    usage=0x05,  # Gamepad
    report_ids=(4,),  # Descriptor uses report ID 4.
    in_report_lengths=(6,),  # This gamepad sends 6 bytes in its report.
    out_report_lengths=(0,),  # It does not receive any reports.
)


usb_hid.enable(
    (
        usb_hid.Device.KEYBOARD,
        usb_hid.Device.MOUSE,
        usb_hid.Device.CONSUMER_CONTROL,
        gamepad,
    )
)