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+# Planck Firmware Guide
+
+## Setting up the environment
+
+### Windows
+1. Install [MHV AVR Tools](https://infernoembedded.com/sites/default/files/project/MHV_AVR_Tools_20131101.exe). Disable smatch, but **be sure to leave the option to add the tools to the PATH checked**.
+2. Install [MinGW](https://sourceforge.net/projects/mingw/files/Installer/mingw-get-setup.exe/download). 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.
+3. Clone this repository. [This link will download it as a zip file, which you'll need to extract.](https://github.com/jackhumbert/qmk_firmware/archive/master.zip) Open the extracted folder in Windows Explorer.
+4. 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.
+5. 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:
+
+1. Install Xcode from the App Store.
+2. Install the Command Line Tools from `Xcode->Preferences->Downloads`.
+3. Install [DFU-Programmer][dfu-prog].
+
+### Linux
+1. Install AVR GCC with your favorite package manager.
+2. Install [DFU-Programmer][dfu-prog].
+
+Note that, since it will be directly accessing USB hardware, the
+`dfu-programmer` program needs to be run as root.
+
+## Verify Your Installation
+1. Clone the following repository: https://github.com/jackhumbert/qmk_firmware
+2. Open a Terminal and `cd` into `qmk_firmware/keyboard/planck`
+3. 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:
+
+1. Make changes to the appropriate keymap file
+2. Save the file
+3. `make clean`
+4. Press the reset button on the PCB/press the key with the `RESET` keycode
+5. `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](http://www.madwizard.org/download/electronics/msys-1.0-vista64.zip).
+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/keyboard/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](https://github.com/jackhumbert/qmk_firmware/blob/master/tmk_core/doc/keycode.txt). For the keycodes available only in the extended keymap, see this [header file](https://github.com/jackhumbert/qmk_firmware/blob/master/quantum/keymap_common.h).
+
+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](https://github.com/jackhumbert/tmk_keyboard/blob/master/common/action_code.h). They are explained in detail [here](https://github.com/jackhumbert/tmk_keyboard/blob/master/doc/keymap.md#2-action).
+
+### 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.
+
+[cygwin]:       https://www.cygwin.com/
+[mingw]:        http://www.mingw.org/
+[mhv]:          https://infernoembedded.com/products/avr-tools
+[winavr]:       http://winavr.sourceforge.net/
+[crosspack]:    http://www.obdev.at/products/crosspack/index.html
+[dfu-prog]:     http://dfu-programmer.sourceforge.net/