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Swift on the Raspberry PI

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

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Why?

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Just another language

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Just another good language

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

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

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Building

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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 !

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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 @

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

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3. Building Swift 6 Hours From sources

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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

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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

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

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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/

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GPIO

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

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

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A basic example import SwiftyGPIO func run() { let gpios = SwiftyGPIO.GPIOs(for:.RaspberryPi2) guard let gpio2 = gpios[.P2], let gpio3 = gpios[.P3] else { return } gpio2.direction = .IN gpio3.direction = .OUT gpio2.onChange{ gpio in gpio3.value = gpio.value } _ = readLine() } run()

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Tools

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SourceKitten

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SwiftKitten + rsub

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SwiftKitten + rsub ssh -R 52698:localhost:52698 $ rsub file.swift

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

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That's (almost) all!

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