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<h1 class="menu-title">Real-Time Interrupt-driven Concurrency</h1>
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<main>
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<h1 id="rtic-by-example"><a class="header" href="#rtic-by-example">RTIC by example</a></h1>
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<p>This part of the book introduces the RTIC framework to new users by walking them through examples of increasing complexity.</p>
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<p>All examples in this part of the book are part of the
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<a href="https://github.com/rtic-rs/rtic/tree/master/rtic/examples">RTIC repository</a>, found in the <code>examples</code> directory.
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The examples are runnable on QEMU (emulating a Cortex M3 target),
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thus no special hardware required to follow along.</p>
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<h2 id="running-an-example"><a class="header" href="#running-an-example">Running an example</a></h2>
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<p>To run the examples with QEMU you will need the <code>qemu-system-arm</code> program.
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Check <a href="https://rust-embedded.github.io/book/intro/install.html">the embedded Rust book</a> for instructions on how to set up an
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embedded development environment that includes QEMU.</p>
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<p>To run the examples found in <code>examples/</code> locally using QEMU:</p>
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<pre><code>cargo xtask qemu
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</code></pre>
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<p>This runs all of the examples against the default <code>thumbv7m-none-eabi</code> device <code>lm3s6965</code>.</p>
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<p>To limit which examples are being run, use the flag <code>--example <example name></code>, the name being the filename of the example.</p>
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<p>Assuming dependencies in place, running:</p>
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<pre><code class="language-console">$ cargo xtask qemu --example locals
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</code></pre>
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<p>Yields this output:</p>
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<pre><code class="language-console"> Finished dev [unoptimized + debuginfo] target(s) in 0.07s
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Running `target/debug/xtask qemu --example locals`
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INFO xtask > Testing for platform: Lm3s6965, backend: Thumbv7
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INFO xtask::run > 👟 Build example locals (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::run > ✅ Success.
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INFO xtask::run > 👟 Run example locals in QEMU (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::run > ✅ Success.
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INFO xtask::results > ✅ Success: Build example locals (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::results > ✅ Success: Run example locals in QEMU (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::results > 🚀🚀🚀 All tasks succeeded 🚀🚀🚀
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</code></pre>
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<p>It is great that examples are passing and this is part of the RTIC CI setup too, but for the purposes of this book we must add the <code>--verbose</code> flag, or <code>-v</code> for short to see the actual program output:</p>
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<pre><code class="language-console">❯ cargo xtask qemu --verbose --example locals
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Finished dev [unoptimized + debuginfo] target(s) in 0.03s
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Running `target/debug/xtask qemu --example locals --verbose`
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DEBUG xtask > Stderr of child processes is inherited: false
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DEBUG xtask > Partial features: false
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INFO xtask > Testing for platform: Lm3s6965, backend: Thumbv7
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INFO xtask::run > 👟 Build example locals (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::run > ✅ Success.
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INFO xtask::run > 👟 Run example locals in QEMU (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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INFO xtask::run > ✅ Success.
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INFO xtask::results > ✅ Success: Build example locals (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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cd examples/lm3s6965 && cargo build --target thumbv7m-none-eabi --features test-critical-section,thumbv7-backend --release --example locals
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DEBUG xtask::results >
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cd examples/lm3s6965 && cargo build --target thumbv7m-none-eabi --features test-critical-section,thumbv7-backend --release --example locals
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Stderr:
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Finished release [optimized] target(s) in 0.02s
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INFO xtask::results > ✅ Success: Run example locals in QEMU (thumbv7m-none-eabi, release, "test-critical-section,thumbv7-backend", in examples/lm3s6965)
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cd examples/lm3s6965 && cargo run --target thumbv7m-none-eabi --features test-critical-section,thumbv7-backend --release --example locals
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DEBUG xtask::results >
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cd examples/lm3s6965 && cargo run --target thumbv7m-none-eabi --features test-critical-section,thumbv7-backend --release --example locals
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Stdout:
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bar: local_to_bar = 1
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foo: local_to_foo = 1
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idle: local_to_idle = 1
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Stderr:
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Finished release [optimized] target(s) in 0.02s
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Running `qemu-system-arm -cpu cortex-m3 -machine lm3s6965evb -nographic -semihosting-config enable=on,target=native -kernel target/thumbv7m-none-eabi/release/examples/locals`
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Timer with period zero, disabling
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INFO xtask::results > 🚀🚀🚀 All tasks succeeded 🚀🚀🚀
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</code></pre>
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<p>Look for the content following <code>Stdout:</code> towards the end ouf the output, the program output should have these lines:</p>
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<pre><code class="language-console">bar: local_to_bar = 1
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foo: local_to_foo = 1
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idle: local_to_idle = 1
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</code></pre>
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<blockquote>
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<p><strong>NOTE</strong>:
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For other useful options to <code>cargo xtask</code>, see:</p>
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<pre><code>cargo xtask qemu --help
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</code></pre>
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<p>The <code>--platform</code> flag allows changing which device examples are run on,
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currently <code>lm3s6965</code> is the best supported, work is ongoing to
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increase support for other devices, including both ARM and RISC-V</p>
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