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Planck Firmware Guide

Setting up the environment

Windows

Install MHV AVR Tools. Disable smatch, but be sure to leave the option to add the tools to the PATH checked.
Install MinGW. During installation, uncheck the option to install a graphical user interface. DO NOT change the default installation folder. The scripts depend on the default location.
Clone this repository. This link will download it as a zip file, which you'll need to extract. Open the extracted folder in Windows Explorer.
Right-click on the 1-setup-path-win batch script, select "Run as administrator", and accept the User Account Control prompt. Press the spacebar to dismiss the success message in the command prompt that pops up.
Right-click on the 2-setup-environment-win batch script, select "Run as administrator", and accept the User Account Control prompt. This part may take a couple of minutes, and you'll need to approve a driver installation, but once it finishes, your environment is complete!

Mac

If you're using homebrew, you can use the following commands:

brew tap osx-cross/avr
brew install avr-libc
brew install dfu-programmer

Otherwise, these instructions will work:

Install Xcode from the App Store.
Install the Command Line Tools from Xcode->Preferences->Downloads.
Install DFU-Programmer.

Linux

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

Note that, since it will be directly accessing USB hardware, the dfu-programmer program needs to be run as root.

Verify Your Installation

Clone the following repository: https://github.com/jackhumbert/qmk_firmware
Open a Terminal and cd into qmk_firmware/keyboards/planck
Run make. This should output a lot of information about the build process.

Using the built-in functions

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

make clean: clean the environment - may be required in-between builds
make: compile the code
make KEYMAP=<keymap>: compile with the extended keymap file extended_keymaps/extended_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.

Troubleshooting

If you see something like this

      0 [main] sh 13384 sync_with_child: child 9716(0x178) died before initialization with status code 0xC0000142
    440 [main] sh 13384 sync_with_child: *** child state waiting for longjmp
/usr/bin/sh: fork: Resource temporarily unavailable

after running 'make' on Windows than you are encountering a very popular issue with WinAVR on Windows 8.1 and 10. You can easily fix this problem by replacing msys-1.0.dll in WinAVR/utils/bin with this one. Restart your system and everything should work fine!

If you see this

dfu-programmer atmega32u4 erase
process_begin: CreateProcess(NULL, dfu-programmer atmega32u4 erase, ...) failed.
make (e=2): The system cannot find the file specified.
make: *** [dfu] Error 2

when trying to 'make dfu' on Windows you need to copy the dfu-programmer.exe to qmk_firmware/keyboards/planck.

Quantum MK Firmware

Keymap

Unlike the other keymaps, 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 available, 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 keymaps/keymap_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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