Planck Firmware Guide

Setting up the environment

Windows

Install MHV AVR Tools for AVR GCC compiler and Cygwin(or MinGW) for shell terminal.
Install DFU-Programmer (the -win one).
Start DFU bootloader on the chip first time you will see 'Found New Hardware Wizard' to install driver. If you install device driver properly you can find chip name like 'ATmega32U4' under 'LibUSB-Win32 Devices' tree on 'Device Manager'. If not you will need to update its driver on 'Device Manager' to the dfu-programmer driver.

Mac

Install CrossPack.
Install DFU-Programmer.

Linux

Install AVR GCC with your favorite package manager.
Install DFU-Programmer.

Using the built-in functions

Here is a list of some of the functions avaiable from the command line:

make clean: clean the environment - may be required in-between builds
make: compile the code
make COMMON=true: compile with the common (non-extended) keymap
make KEYMAP=<keymap>: compile with the extended keymap file extended_keymaps_extended_keymap_<keymap>.c
make COMMON=true KEYMAP=<keymap>: compile with the common keymap file common_keymaps/keymap_<keymap>.c
make dfu: build and flash the layout to the PCB
make dfu-force: build and force-flash the layout to the PCB (may be require for first flash)

Generally, the instructions to flash the PCB are as follows:

Make changes to the appropriate keymap file
Save the file
make clean
Press the reset button on the PCB/press the key with the RESET keycode
make <arguments> dfu - use the necessary KEYMAP=<keymap> and/or COMMON=true arguments here.

Extended keymap

Keymap

Unlike the common keymap, prefixing the keycodes with KC_ is required. A full list of the keycodes is available here. For the keycodes available only in the extended keymap, see this header file.

You can use modifiers with keycodes like this:

LCTL(KC_C)

Which will generate Ctrl+c. These are daisy-chainable, meaning you can do things like:

LCTL(LALT(KC_C))

That will generate Ctrl+Alt+c. The entire list of these functions is here:

LCTL(): Left control
LSFT() / S(): Left shift
LALT(): Left alt/opt
LGUI(): Left win/cmd
RCTL(): Right control
RSFT(): Right shift
RALT(): Right alt/opt
RGUI(): Right win/cmd

S(KC_1)-like entries are useful in writing keymaps for the Planck.

Other keycodes

A number of other keycodes have been added that you may find useful:

CM_<key>: the Colemak equivalent of a key (in place of KC_<key>), when using Colemak in software (CM_O generates KC_SCLN)
RESET: jump to bootloader for flashing (same as press the reset button)
BL_STEP: step through the backlight brightnesses
BL_<0-15>: set backlight brightness to 0-15
BL_DEC: lower the backlight brightness
BL_INC: raise the backlight brightness
BL_TOGG: toggle the backlight on/off

Function layers

The extended keymap extends the number of function layers from 32 to the near-infinite value of 256. Rather than using FN<num> notation (still avaiable, but limited to FN0-FN31), you can use the FUNC(<num>) notation. F(<num>) is a shortcut for this.

The function actions are unchanged, and you can see the full list of them here. They are explained in detail here.

Macros

Macros have been setup in the extended_keymaps/extended_keymaps_default.c file so that you can use M(<num>) to access a macro in the action_get_macro section on your keymap. The switch/case structure you see here is required, and is setup for M(0) - you'll need to copy and paste the code to look like this (e.g. to support M(3)):

switch(id) {
  case 0:
    return MACRODOWN(TYPE(KC_A), END);
    break;
  case 1:
    return MACRODOWN(TYPE(KC_B), END);
    break;
  case 2:
    return MACRODOWN(TYPE(KC_C), END);
    break;
  case 3:
    return MACRODOWN(TYPE(KC_D), END);
    break;
} 
return MACRO_NONE;

MACRODOWN() is a shortcut for (record->event.pressed ? MACRO(__VA_ARGS__) : MACRO_NONE) which tells the macro to execute when the key is pressed. Without this, the macro will be executed on both the down and up stroke.

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