From 3b76bd6b33b997fde9c4a0be0154bdcbcd7a8042 Mon Sep 17 00:00:00 2001 From: Kelsey Breseman Date: Sat, 17 Sep 2016 12:00:43 -0400 Subject: [PATCH] Rust blinky --- blinky-rust.html | 8 +++ blinky-rust.md | 145 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 153 insertions(+) create mode 100644 blinky-rust.html create mode 100644 blinky-rust.md diff --git a/blinky-rust.html b/blinky-rust.html new file mode 100644 index 0000000..cc55e30 --- /dev/null +++ b/blinky-rust.html @@ -0,0 +1,8 @@ +--- +layout: default +--- + +{% capture include_install %} +{% include_relative blinky-rust.md %} +{% endcapture %} +{{ include_install | markdownify }} diff --git a/blinky-rust.md b/blinky-rust.md new file mode 100644 index 0000000..cc20177 --- /dev/null +++ b/blinky-rust.md @@ -0,0 +1,145 @@ +{::options parse_block_html="true" /} + +
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+![](http://i.imgur.com/jDRIX06.jpg) +
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+# Hello, (Physical) World! + +Blinking some lights is the "Hello World" of hardware. Let's make those LEDs built into Tessel 2 dance for us. + +In your command line, make a folder for your Tessel code, then initialize a Tessel project in that folder by running each of the following commands in the terminal: + +`mkdir tessel-code` + +`cd tessel-code` + +`t2 init --lang=rust` + +Those three steps are: + +1. Make a folder called "tessel-code" +2. Enter your new "tessel-code" folder +3. Initialize a Tessel project using the language Rust + +Great! Now you're set up to run code on Tessel. Your "tessel-code" folder contains: + +* a "Cargo.toml" with some metadata Rust uses for your project +* a folder called "src" to hold your Rust code +* an entrypoint file called "main.rs" in the src folder + +
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+ +You can open and look at any of the files to learn more about them. But right now we're most interested in main.rs. + +
+ +"main.rs" contains the code to make the blue and green LEDs blink. Let's take a look: + +{% highlight rust %} +//! A blinky example for Tessel + +// Import the tessel library +extern crate rust_tessel; +// Import the Tessel API +use rust_tessel::Tessel; +// Import sleep from the standard lib +use std::thread::sleep; +// Import durations from the standard lib +use std::time::Duration; + +fn main() { + // Create a new Tessel + let mut tessel = Tessel::new(); + + // Turn on one of the LEDs + tessel.led[2].on().unwrap(); + + println!("I'm blinking! (Press CTRL + C to stop)"); + + // Loop forever + loop { + // Toggle each LED + tessel.led[2].toggle().unwrap(); + tessel.led[3].toggle().unwrap(); + // Re-execute the loop after sleeping for 100ms + sleep(Duration::from_millis(100)); + } +} +{% endhighlight %} + +
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+ +When we work with Rust, commands are executed through the Cargo file. In your command line, enter + +`t2 run Cargo.toml` + +to run your code in Tessel's RAM. + +**Look at your Tessel!** The blue and green LEDs on your Tessel's LED panel should blink back and forth. + +
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+ +![](http://i.imgur.com/kZIZNcL.gif) + +
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+ +**Bonus:** mess with the code to make the LEDs blink in sync. + +**Extra bonus:** Want to untether your computer from your Tessel? Run: + +`t2 push Cargo.toml` + +Now plug Tessel in to USB power, just like plugging in a phone or an original Tessel. + +
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+ +Wait for it to boot up, then... lights will blink! + +Tired of the blinking lights? `t2 erase` will clear the saved code. + +If you're connected over LAN, you can run any of these commands remotely, without plugging Tessel back into your computer. + +Learn more `t2` commands by running `t2 -h` or looking at the [T2 CLI docs](https://tessel.io/docs/cli). + +
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+ +![](http://i.imgur.com/2JXAPKt.jpg) + +
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+ +![](http://i.imgur.com/kFHhIim.jpg) + +
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