Turns a Logitech G402 Mouse into a Camera!

Ever wanted to know what the optical sensor in your mouse see?

Here i hacked a Logitech G402 Gaming mouse and uploaded my own firmware to grab pixels off the sensor and send them over usb to a linux machine, where a sdl2 program renders it on screen!

To replicate this for yourself, you need:

1. A logitech G402 lying around that you dont care about(will be destroyed..kindof..you can actually make it into a mouse again)
2. A stlink-v2 clone.. to reprogram the STM32 onboard the mouse.
3. have sdl2 installed in your system for the GUI application to successfuly compile.

The firmware directory contains the actual STM32CubeMX project, if you want to read the code you can.. else you just need to flash the logitech-g402.bin file under Debug to the mouse.

Then you need to build the usbd kernel module under usbd_driver.. just do sudo make

Then you need to load this module into the the kernel by sudo insmod usbd.ko

Then you can plug in the mouse into your PC.

After that you need to set permissions for our device file by doing sudo chmod 777 /dev/usbd

After that you can build g402_capture.cpp and run it by doing make g402_capture && ./gcap

And then BOOM!