# How to build the rusEFI firmware from the source files  

## Step-by-step guide to creating the build environment in windows 10+ using Windows Shell for Linux

The best way to build the rusEFI firmware is using a set of tools that run best under linux,

1. Install WSL
   Run the following in an elevated powershell  

```shell
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
```

2. Download linux  
   Download the appx for linux 2004 from here:
   [WSL Install Manual](https://docs.microsoft.com/en-us/windows/wsl/install-manual)  
   Or type the following into powershell:  

```shell
cd ubuntu/
Invoke-WebRequest -Uri <https://aka.ms/wsl-ubuntu-2004> -OutFile Ubuntu.appx -UseBasicParsing
```

   This command will download the file to the currently active directory.  

3. install linux

```shell
PS C:\Windows\system32> cd c:/Ubuntu
PS C:\Ubuntu> Add-AppxPackage Ubuntu_2004.2020.424.0_x64.appx
```

   Open start menu and launch linux  
   Wait for it to complete install and ask for username and password

4. check WSL default install
   In powershell type:  

```shell
wslconfig /l
```

   Make sure the ubuntu 2004 is marked as default.

5. get git  

```shell
sudo apt-get install git
```

6. clone git  

```shell
git clone <https://github.com/YOUR-REPOSITORY/rusefi.git>
```

7. Run setup script  

```shell
cd /home/owner/rusefi/firmware
sh setup_linux_environment.sh
```

8. install VScode in windows  
   Download and install as normal, is should detect WSL and ask to install the extension for it, do this and close VScode  

9. Install VScode in linux  

```shell
cd /home/owner/rusefi
code .
```

10. Hit ctrl-b and run "build unit tests"
    Allow to run and complete, it may exit with "multiple targets" error, if so just run it a second time.  

11. exit both VScode and ubunu  
    Click the x in VScode and type exit in ubuntu  

12. reboot ubuntu from the start menu and run make  

```shell
cd /home/owner/rusefi/firmware
make -j$(nproc)
```

    This should build the firmware for the F407 Discovery board  

13. If successful then reopen VScode in ubuntu  

```shell
cd /home/owner/rusefi
code .
```

14. Run the built tool for the specific board in VScode  
    Ctrl-Shift-B and select the chosen board, this should build the firmware.  

- Note submodules are their own thing - the main repo just contains a pointer to where the submodule should be checked out  

- Zach method:

install wsl (already have ubuntu 20.04 on wsl2)  

```shell
sudo apt update
sudo apt install openjdk-8-jre-headless -y
curl -O <https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu-rm/9-2020q2/gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2>
tar -xf gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2
```

## Without WSL

A less fancy toolchain without WSL works as well.
There is [a forum thread](https://rusefi.com/forum/viewtopic.php?f=5&t=9) on building the firmware, but be aware that it contains some out-of-date information.

## Linux

See [Developing on Linux](Developing-On-Linux)