This document provides instructions for setting up Swift programming on a Raspberry Pi, including downloading Swift binaries, installing dependencies, and using the SwiftyGPIO library to access GPIO pins. Key steps include installing Ubuntu Core or Raspbian on an SD card, installing Swift binaries from a URL or building from source, installing dependencies like libxml2 and clang, and using SwiftyGPIO to configure pin directions and read/write values to control an output pin based on an input pin. Tools like SourceKitten and rsub enable using the Swift compiler and debugger remotely over SSH.

1. Swift on the Raspberry PI

3. TOC
1. Why
2. Building
3. GPIO
4. Tools

4. Why?

5. Just
another
language

6. Just
another
good
language

7. Advantages
4 Expressive
4 Fast
4 Memory-efficient
4 C-compatible

8. Downsides
4 Not a real platform (such as Android Things)
4 Not many drivers
4 ARM Linux not officially supported by Apple (yet)

9. Building

10. Requirements
4 Raspberry PI 3
4 Micro-SD Card (8 or 16 GB)
4 Ubuntu Core (+ Ubuntu SSO Account) or Raspbian
4 External Screen (just for first booting)
4 HDMI Cable !

11. 1. Ubuntu Core
1. Create an Ubuntu SSO Account
2. Read https://developer.ubuntu.com/core/get-
started/raspberry-pi-2-3
3. Install on the micro-SD card
4. ssh <USERNAME>@<RASPBERRY-IP>

12. 2. The "Classic" mode
1. sudo snap install classic --edge --devmode
2. sudo classic

13. 3. Building Swift
6 HoursFrom sources

14. 3. (not) Building Swift
(The I've-just-got-30-minutes way)
$ http://swift-arm.ddns.net/job/Swift-3.0-Pi3-ARM-Incremental/
lastSuccessfulBuild/artifact/
swift-3.0-2016-12-21-RPi23-ubuntu16.04.tar.gz
or
$ wget https://www.dropbox.com/s/cah35gf5ap22d11/swift-3.0.2-RPi23-1604.tgz
Courtesy of @uraimo

15. 4. Dependencies
$ sudo apt-get install -y libpython2.7 libxml2 libicu-dev clang-3.6 libcurl3
$ sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-3.6 100
$ sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.6 100

16. 5. All set!
$ swift --version
> Swift version 3.0.1-dev (LLVM a922364e5b, Clang 968470f170, Swift 0cca6668a2)

17. Resources
4 http://viteinfinite.com/2017/02/swift-on-the-
raspberry-pi-part-1/
4 http://dev.iachieved.it/iachievedit/building-
swift-3-0-on-an-armv7-system/
4 https://www.uraimo.com/2016/12/30/Swift-3-0-2-
for-raspberrypi-zero-1-2-3/

18. GPIO

19. 4 https://github.com/uraimo/SwiftyGPIO

20. let package = Package(
name: "MyProject",
dependencies: [
.Package(url: "https://github.com/uraimo/SwiftyGPIO.git",
majorVersion: 0),
]
)

22. A basic example
import SwiftyGPIO
let gpios = SwiftyGPIO.GPIOs(for:.RaspberryPi2)
guard var gpio2 = gpios[.P2], var gpio3 = gpios[.P3] else {
return
}
gpio2.direction = .IN
gpio3.direction = .OUT
while true {
gpio3.value = gpio2.value == 1 ? 0 : 1
}

25. Tools

27. SourceKitten

28. SwiftKitten + rsub

29. SwiftKitten + rsub
ssh -R 52698:localhost:52698 <user@remoteHost>
$ rsub file.swift

30. Resources
4 https://github.com/johncsnyder/SwiftKitten
4 https://github.com/Drarok/rsub

31. That's (almost) all!