pelya
commented
9 years ago First, there is a kernel patch - this is dark magic, without which nothing will work. This patch adds two new devices to your Android system, /dev/hidg0 for keyboard, and /dev/hidg1 for mouse. If you want to add HID joystick for example, you need to modify hid_function_bind_config() and hid_function_init(), and another struct ghid_device_android_joystick, with proper USB descriptor. The best way to get USB descriptor is to buy USB analyzer, and copy data from existing USB joystick. You can also read USB specification: http://en.wikipedia.org/wiki/USB_human_interface_device_class
Then you need Android application, which will write data to these devices. It doesn't matter if it's written in C or Java, as long as it writes valid data to these files. Keyboard/mouse protocol description is here: https://github.com/pelya/android-keyboard-gadget#how-it-works My Android app is written in C++ and uses SDL library. gfx.cpp contains low-level graphics functions, gui.cpp is a GUI widgets implementation, flash-kernel.cpp is for flashing kernel on Nexus 7, input.cpp is for opening device files and writing data to them, main.cpp is, well, main(), touchpad.cpp is the touchpad implementation, and scancodes.cpp contains keyboard scancode table.
On Mon, Nov 10, 2014 at 12:45 PM, the-st0rm notifications@github.com wrote:
What should I read exactly to understand what you have coded entirely. I need something like a walkthough of your code to understand what is this function and why it is used etc etc, so that I can develop on top of that.
Best Regards
— Reply to this email directly or view it on GitHub https://github.com/pelya/android-keyboard-gadget/issues/12.
the-st0rm
conrad-heimbold
What should I read exactly to understand what you have coded entirely. I need something like a walkthough of your code to understand what is this function and why it is used etc etc, so that I can develop on top of that.
Best Regards