Keyboard Typing Message - mooltipass/minible GitHub Wiki

Keyboard Typing Message

This message is sent by the main MCU to tell the aux MCU to type a list of symbols.

From Main MCU:

byte 0 - 1	byte 2 - 3	byte 4 - 5	byte 6 - 7	byte 8 - X
0x0008	Payload Length	HID interface	Delay between presses	0 terminated list of 16bits symbols

HID interface: 0 for USB, 1 for BLE
Delay between presses: delay in ms between each HID report send

Reply from Aux MCU:

byte 0 - 1	byte 2 - 3	byte 4 - 5	byte 6 - 559
0x00008	2	0 if typing failure, something else otherwise	DNC

16bits symbol format:

byte 0	Description
0xFF	ignore symbol
0x00	byte 1 contains key & modifier
0x80	byte 1 contains key & modifier, dead key bitmask
else	(first) key + modifier

byte 1	Description
0x00	(second) key + modifier

Key + modifier format

bit 7	bit 6	bit 5 to 0
shift bitmask	altgr bitmask	HID code to send

HID code

HID code to send. 0x03 is remapped to 0x64
After parsing multiple keyboard mappings we found the following key codes to not be used: 0x00 0x01 0x02 0x03 0x28 0x29 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F, allowing us to implement the 16bit symbol structure described above.