Information related to ps2avr bootmapper based keyboards
I have a VE.a clone that I got from aliexpress. This repo records some notes that I made when researching the protocol to get/set keymaps from the keyboard. My goal was to be able do do this via Linux/Unix because the Bootmapper client only supported the Mac or Windows. Maybe some of this information will be helpful to others.
This repo has a backup of the JSON files used to upload the layout to the Bootmapper Mac/Windows client.
Unfortunately, the source code is not available for the binaries embedded in the Bootmapper Adobe Air app. These binaries are responsible for the actual USB communication with the keyboard.
However, the source code for the firmware is probably here: https://github.com/showjean/ps2avrU/
What I ended up doing was capture the USB traffic in sigrok while doing multiple downloads and a single upload. Those traces are in the sigrok-traces directory.
I will only mention that the firmware code is a bit hard to follow. The traces show the relevant info. However, they roughtly correspond to requests made to vusb.c. The requests are a HID_REPORT_OPTION. The author then does a switch on the packet length (wut?) as a way of differentiating messages. The code then uses OPTION_GET_REPORT_LENGTH_KEYMAP_LAYER1 to determine which chunk of memory from KEYMAP_ADDRESS to send out.