The Easy Way

If you have an ErgoDox EZ, the absolute easiest way for you to customize your firmware is using the graphical configurator, which uses QMK under the hood.

If you can find firmware someone else has made that does what you want, that is the easiest way to customize your ErgoDox. It requires no programming experience or the setup of a build environment.

Quickstart:

Find and download an existing firmware from Other Firmware Options
Then flash the firmware to your ErgoDox Ez or ErgoDox Infinity

Customizing Keymaps

There are many existing keymaps in the "keymaps" directory. If you just want to use one of them, you don't need to modify keymaps and can just build and flash the firmware as described below. These directories each have a "readme.md" file which describe them.

If none of the existing keymaps suit you, you can create your own custom keymap. This will require some experience with coding. Follow these steps to customize a keymap:

Read the qmk firmware README from top to bottom. Then come back here. :)
Clone the qmk_firmware repository
Set up your build environment (see below).
Make a new directory under "keymaps" to hold your customizations.
Copy an existing keymap that is close to what you want, such as "keymaps/default/keymap.c".
Use an editor to modify the new "keymap.c". See "Finding the keycodes you need" below). Try to edit the comments as well, so the "text graphics" represent your layout correctly.
Compile your new firmware (see below)
Flash your firmware (see below)
Test the changes.
Submit your keymap as a pull request to the qmk_firmware repository so others can use it. You will want to add a "readme.md" that describes the keymap.

Build Dependencies

Before you can build, you will need the build dependencies. There is a script to try to do this for Linux:

Run the util/install_dependencies.sh script as root.

For the Infinity, you need the chibios submodules to be checked out or you will receive errors about the build process being unable to find the chibios files. Check them out with:

Go to the top level repo directory and run: git submodule update --init --recursive

Flashing Firmware

ErgoDox EZ

The Ez uses the Teensy Loader.

Linux users need to modify udev rules as described on the Teensy Linux page. Some distributions provide a binary, maybe called teensy-loader-cli.

To flash the firmware:

Build the firmware with make keymapname, for example make default
This will result in a hex file called ergodox_ez_keymapname.hex, e.g. ergodox_ez_default.hex
Start the teensy loader.
Load the .hex file into it.
Press the Reset button by inserting a paperclip gently into the reset hole in the top right corder.
Click the button in the Teensy app to download the firmware.

To flash with ´teensy-loader-cli´:

Build the firmware with make keymapname, for example make default
Run ´<path/to/>teensy_loader_cli -mmcu=atmega32u4 -w ergodox_ez_.hex´
Press the Reset button by inserting a paperclip gently into the reset hole in the top right corder.

ErgoDox Infinity

The Infinity is two completely independent keyboards, and needs to be flashed for the left and right halves seperately. To flash them:

Build the firmware with make infinity-keymapname
Plug in the left hand keyboard only.
Press the program button (back of keyboard, above thumb pad).
Install the firmware with sudo make infinity-keymapname-dfu-util
Build right hand firmware with make infinity-keymapname MASTER=right
Plug in the right hand keyboard only.
Press the program button (back of keyboard, above thumb pad).
Install the firmware with sudo make infinity-keymapname-dfu-util MASTER=right

More information on the Infinity firmware is available in the TMK/chibios for Input Club Infinity Ergodox

Infinity Master/Two Halves

The Infinity is two completely independent keyboards, that can connect together. You have a few options in how you flash the firmware:

Flash the left half, rebuild the firmware with "MASTER=right" and then flash the right half. This allows you to plug in either half directly to the computer and is what the above instructions do.
Flash the left half, then flash the same firmware on the right. This only works when the left half is plugged directly to the computer and the keymap is mirrored. It saves the small extra step of rebuilding with "MASTER=right".
The same as the previous one but with "MASTER=right" when you build the firmware, then flash the same firmware to both halves. You just have to directly connect the right half to the computer.
For minor changes such as changing only the keymap without having updated any part of the firmware code itself, you can program only the MASTER half. It is safest to program both halves though.

Contributing your keymap

The QMK firmware is open-source, so it would be wonderful to have your contribution! Within a very short time after launching we already amassed dozens of user-contributed keymaps, with all sorts of creative improvements and tweaks. This is very valuable for people who aren't comfortable coding, but do want to customize their ErgoDox. To make it easy for these people to use your layout, I recommend submitting your PR in the following format.

All work goes inside your keymap subdirectory (keymaps/german in this example).
keymap.c - this is your actual keymap file; please update the ASCII comments in the file so they correspond with what you did.
readme.md - a readme file, which GitHub would display by default when people go to your directory. Explain what's different about your keymap, what you tweaked or how it works. No specific format to follow, just communicate what you did. :)
Any graphics you wish to add must be hosted elsewhere (please don't include images in your PR). This is absolutely not a must. If you feel like it, you can use Keyboard Layout Editor to make something and grab a screenshot, but it's really not a must. If you do have graphics, your readme can just embed the graphic as a link (![alt-text](url)), just like I did with the default layout.

Finding the keycodes you need

Let's say you want a certain key in your layout to send a colon; to figure out what keycode to use to make it do that, you're going to need quantum/keymap_common.h.

That file contains a big list of all of the special, fancy keys (like, being able to send % on its own and whatnot).

If you want to send a plain vanilla key, you can look up its code under doc/keycode.txt. That's where all the boring keys hang out.

Other Firmware Options

There are external tools for customizing the layout, but those do not use the featurs of this qmk firmware. These sites include:

The official ErgoDox EZ configurator
Massdrop configurator for EZ, works but not officially supported
Input Club configurator for Infinity, provides left and right files

You can also find an existing firmware that you like, for example from:

Dozens of community-contributed keymaps

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