Improved dev setup docs.

docs/docs/dev-setup.md

@@ -4,9 +4,109 @@ title: Basic Setup
 sidebar_label: Basic Setup
 ---
 
-1. Install `west` from pip.
+## Preprequisites
-1. Install the ARM SDK from Zephyr project.
+
-1. (Optional) Install 32-bit libs for building and testing locally.
+A unix-like environment with Python 3 installed. So far this has been tested on Fedora and Debian. Further testing is required for macOS and WSL.
-1. `west init -l zmk`
+
-1. Build it.
+## Setup
-1. Flash it.
+
+### West Build Command
+
+`west` is the [Zephyr meta-tool](https://docs.zephyrproject.org/latest/guides/west/index.html) used to configure and build Zephyr applications. It can be installed by using the `pip` python package manager:
+
+```bash
+pip install --user west
+```
+
+:::note
+If you don't already have it configured, you may need to update your
+`PATH` to include the pip install path. See [User Installs](https://pip.pypa.io/en/stable/user_guide/#user-installs) and (Stack Overflow)[https://stackoverflow.com/questions/38112756/how-do-i-access-packages-installed-by-pip-user] for more details.
+:::
+
+### Zephyr ARM SDK
+
+To build firmwares for the ARM architecture (all supported MCUs/keyboards at this point), you'll need to install the Zephyr ARM SDK to your system:
+
+```
+export ZSDK_VERSION=0.11.3
+wget -q "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZSDK_VERSION}/zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run" && \
+	sh "zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run" --quiet -- -d /opt/toolchains/zephyr-sdk-${ZSDK_VERSION} && \
+	rm "zephyr-toolchain-arm-${ZSDK_VERSION}-setup.run"
+```
+
+### Source Code
+
+Next, you'll need to clone the ZMK source repository if you haven't already:
+
+```
+git clone https://github.com/zmkfirmware/zmk.git
+```
+
+### Initialize & Update Zephy Workspace
+
+Since ZMK is build as a Zephyr application, the next step is
+to use `west` to initialize and update your workspace. The ZMK
+Zephyr application is in the `app/` source directory:
+
+#### Initialize West
+
+```bash
+west init -l app/
+```
+
+#### Update To Fetch Modules
+
+```bash
+west update
+```
+
+#### Export Zephyr Core
+
+```bash
+west zephyr-export
+```
+
+## Build
+
+To build for your particular keyboard, the behaviour varies slightly depending on if you are building for a keyboard with
+an onboard MCU, or one that uses a MCU board addon.
+
+### Keyboard (Shield) + MCU Board
+
+ZMK treats keyboards that take a MCU addon board as [shields](https://docs.zephyrproject.org/latest/guides/porting/shields.html), and treats the smaller MCU board as the true [board](https://docs.zephyrproject.org/latest/guides/porting/board_porting.html)
+
+Given the following:
+
+- MCU Board: Proton-C
+- Keyboard PCB: kyria
+- Keymap: default
+
+You can build ZMK with the following:
+
+```bash
+west build -b proton_c -- -DSHIELD=kyria -DKEYMAP=default
+```
+
+### Keyboard With Onboard MCU
+
+Keyboards with onboard MCU chips are simply treated as the [board](https://docs.zephyrproject.org/latest/guides/porting/board_porting.html) as far as Zephyr is concerned.
+
+Given the following:
+
+- Keyboard: Planck
+- Keymap: default
+
+you can build ZMK with the following:
+
+```bash
+west build -b planck -- -DKEYMAP=default
+```
+
+## Flashing
+
+Once built, the previously supplied parameters will be remember, so you can simply run the following to flash your
+board, with it in bootloader mode:
+
+```
+west flash
+```