Infinity
========
Massdrop Infinity Keyboard:
https://www.massdrop.com/buy/infinity-keyboard-kit

kiibohd controller(MD1):
https://github.com/kiibohd/controller

DFU bootloader:
https://github.com/kiibohd/controller/tree/master/Bootloader

Program with bootloader:
    $ dfu-util -D kiibohd.dfu.bin

Pinout:
https://github.com/kiibohd/controller/blob/master/Scan/MD1/pinout

MCHCK compatible:
https://mchck.org/about/

MCU Freescale MK20DX128VLF5 48-QFP:
http://cache.freescale.com/files/32bit/doc/data_sheet/K20P48M50SF0.pdf



Pin Usage
=========
Key Matrix:
    Strobe(output high):            PTB0 PTB1 PTB2 PTB3 PTB16 PTB17 PTC4 PTC5 PTD0
    Sense(input with pull-down):    PTD1 PTD2 PTD3 PTD4 PTD5 PTD6 PTD7


SWD pinout:
    SWD_CLK(PTA0) SWD_DIO(PTA3)
    SWD pins are placed next to reset button; SWD_CLK, SWD_DIO, GND, VCC from top.
    Note that RESET is also needed to get full control with OpenOCD.

LED:
    PTA19(turns on with output high)



Memory map
==========
kiibohd bootloader: Lib/mk20dx128vlf5.bootloader.ld
0x0000_0000 +-------------------+ -----------------+---------------+ Vector table
            | .vectors          | ------------.    | StackPointer0 |     of Bootloader
            | .startup          |              \   | ResetHandler1 |
            | .rodata           |               `--+---------------+ 0xF8
0x0000_0400 | .flashconfig(0x10)| 
      _0410 | .text             |
            | .init             |
0x0000_1000 +-------------------+ -----------------+---------------+ Vector table
            | _app_rom          | ------------.    |               |     of App
            |                   |              \   |               |
            |                   |               `--+---------------+
            |                   |
            ~                   ~
            |                   |
0x07FF_FFFF +-------------------+ 128KB


0x1FFF_E000 +-------------------+ -----------------+---------------+ Vector table
      _E0F8 |                   | ------------.    |               |     of App(copied)
            |                   |              \   |               |  
            |                   |               `--+---------------+ mbed NVIC
            |                   |
            | RAM               |
            |                8KB|
0x2000_0000 +-------------------+
            |                   |
            |                   |
            |                   |
            |                   |
            | RAM               |
            |                8KB|
0x2000_2000 +-------------------+ _estack