Logitech G102 LightSync
===

## USB Decriptor Architecture


## Device Desc.

* bcdUSB: 2.0 (0x0200)
* idVendor: Logitech, Inc. (0x046d)
* idProduct: G102/G203 LIGHTSYNC Gaming Mouse (0xc092)
* bMaxPacketSize: 64 (high speed)

:::spoiler USB Speed
1. Low Speed: 8
2. SuperSpeed: 512
:::

* bNumConfigurations: 1

## Config Desc.

* bmAttributes: 0xa0

1... .... = Must be 1 for USB 1.1 or higher
.0.. .... = Self-Powered (Powered from the USB bus)
..1. .... = Remote Wakeup

* bMaxPower: 150 (300mA)
* bNumInterfaces: 2

## Interface Desc. 0

* bInterfaceClass: HID (0x03)
* bInterfaceSubClass: Boot Interface (0x01)
* bInterfaceProtocol: Mouse (0x02)
* bNumEndpoints: 1

## Endpoint Desc.

* bEndpointAddress: 0x81

1... .... = In
.... 0001 = Endpoint Number: 0x1

* bmAttributes: 0x03

.... ..11 = Interrupt-Transfer

* wMaxPacketSize: 8

...0 0... .... .... = Transactions per microframe: 1 (0)
.... ..00 0000 1000 = Max Packet Size: 8

* bInterval: 1

## Interface Desc. 1

* bInterfaceClass: HID (0x03)
* bInterfaceSubClass: None (0x00)
* bInterfaceProtocol: 0x00
* bNumEndpoints: 1

## Endpoint Desc.

* bEndpointAddress: 0x82

1... .... = In
.... 0002 = Endpoint Number: 0x2

* bmAttributes: 0x03

.... ..11 = Interrupt-Transfer

* wMaxPacketSize: 8

...0 0... .... .... = Transactions per microframe: 1 (0)
.... ..00 0001 0100 = Max Packet Size: 20

* bInterval: 1

## Reference

1. [WinDriver USB Overview](https://www.jungo.com/st/support/documentation/windriver/802/wdusb_man_mhtml/node22.html)
2. [Standard USB descriptors](https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/standard-usb-descriptors)
3. [How to send a USB control transfer](https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-control-transfer)