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You have found the QMK Firmware documentation site. This is a keyboard firmware based on the [tmk_keyboard firmware](http://github.com/tmk/tmk_keyboard) with some useful features for Atmel AVR controllers, and more specifically, the [OLKB product line](http://olkb.com), the [ErgoDox EZ](http://www.ergodox-ez.com) keyboard, and the [Clueboard product line](http://clueboard.co/). It has also been ported to ARM chips using ChibiOS. You can use it to power your own hand-wired or custom keyboard PCB.
Understanding the essential changes made on the [tmk_keyboard firmware](http://github.com/tmk/tmk_keyboard) should help you understand the QMK Firmware.
| Firmware |TMK |QMK |
|------------------------------|-----------------------|-------------------------|
| Maintainer |hasu (@tmk) |Jack Humbert et al. |
| Build path customization | `TMK_DIR = ...` | `include .../Makefile` |
| `keymaps` array data | 3D array of `uint8_t` holding **keycode** | 3D array of `uint16_t` holding **action code** |
| `fn_actions` array data | 1D array of `uint16_t` holding **action code** | 1D array of `uint16_t` holding **action code** |
# Getting started
Before you are able to compile, you'll need to install an environment for AVR development. You'll find the instructions for any OS below. If you find another/better way to set things up from scratch, please consider [making a pull request](https://github.com/qmk/qmk_firmware/pulls) with your changes!
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* [Build Environment Setup](Build-Environment-Setup)
* [QMK Overview](QMK-Overview)
# Going beyond the keycodes
# Configuring QMK Firmware
Aside from the [basic keycodes](https://github.com/qmk/qmk_firmware/wiki/Keycodes), your keymap can include shortcuts to common operations.
The QMK Firmware can be configured via the `keymaps` array data.
## Quick aliases to common actions
For simply generating a [basic keycode](https://github.com/qmk/qmk_firmware/wiki/Keycodes), you add it as an element of your `keymaps` array data.
Your keymap can include shortcuts to common operations (called "function actions" in tmk). To learn more about them check out the [Key Functions](Key-Functions) page.
For more complicated actions, you add the corresponding **action code** directly as an element of your `keymaps` array data.
The **action code** is a 16 bit data and organized carefully to represent common operations with the combination of C macros. It is sometimes called quantum keycode in the QMK source comment.
For example, the keycode `KC_8` as an element of your `keymaps` array data is for generating keystroke of "8". The action code `SHFT(KC_8)` an element of your `keymaps` array data is for generating key stroke of "*" which is "8" key shifted.
Please note only up to 32 **action codes** were usable in `fn_actions` array data and accessed via special keycodes (`KC_FN0` to `KC_FN31`) in `keymaps` array data in tmk.
For more details of the `keymaps` array, see [Keymap Overview](Keymap) page.
## C macro functions for action code
Basic C macro functions is documented in the [Key Functions](Key-Functions) page.
There are several new standardized support for common operations with new action codes as follows.
## Space Cadet Shift: The future, built in