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| <li class="toctree-l4"><a class="reference internal" href="../../bridge/index.html"><code class="docutils literal notranslate"><span class="pre">bridge</span></code> Network Bridge</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../buttons/index.html"><code class="docutils literal notranslate"><span class="pre">buttons</span></code> Read GPIO Buttons</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../calib_udelay/index.html"><code class="docutils literal notranslate"><span class="pre">calib_udelay</span></code> Calibration tool for udelay</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../camera/index.html"><code class="docutils literal notranslate"><span class="pre">camera</span></code> Camera Snapshot</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../can/index.html"><code class="docutils literal notranslate"><span class="pre">can</span></code> CAN Device Test</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../capture/index.html"><code class="docutils literal notranslate"><span class="pre">capture</span></code> PWM Capture example</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../cctype/index.html"><code class="docutils literal notranslate"><span class="pre">cctype</span></code> Verify C++ cctype operations</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../etl/index.html"><code class="docutils literal notranslate"><span class="pre">etl</span></code> Embedded Template Library (ETL) C++ example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../fb/index.html"><code class="docutils literal notranslate"><span class="pre">fb</span></code> Framebuffer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../fboverlay/index.html"><code class="docutils literal notranslate"><span class="pre">fboverlay</span></code> Framebuffer overlay test tool</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../flash_test/index.html"><code class="docutils literal notranslate"><span class="pre">flash_test</span></code> SMART Flash test</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../flowc/index.html"><code class="docutils literal notranslate"><span class="pre">flowc</span></code> Serial Hardware Flow Control</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../foc/index.html"><code class="docutils literal notranslate"><span class="pre">foc</span></code> FOC motor controller example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ft80x/index.html"><code class="docutils literal notranslate"><span class="pre">ft80x</span></code> FT80x GUI Chip</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ftpc/index.html"><code class="docutils literal notranslate"><span class="pre">ftpc</span></code> FTP Client</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ftpd/index.html"><code class="docutils literal notranslate"><span class="pre">ftpd</span></code> FTP daemon</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../fxos8700cq_test/index.html"><code class="docutils literal notranslate"><span class="pre">fxos8700cq_test</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../gpio/index.html"><code class="docutils literal notranslate"><span class="pre">gpio</span></code> GPIO Read and Write</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../hall/index.html"><code class="docutils literal notranslate"><span class="pre">hall</span></code> Hall effect sensor example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hdc1008_demo/index.html"><code class="docutils literal notranslate"><span class="pre">hdc1008_demo</span></code> HDC1008 driver example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hello/index.html"><code class="docutils literal notranslate"><span class="pre">hello</span></code> Hello World</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hello_nim/index.html"><code class="docutils literal notranslate"><span class="pre">hello_nim</span></code> Hello World in Nim</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hello_wasm/index.html"><code class="docutils literal notranslate"><span class="pre">hello_wasm</span></code> Hello World in WASM</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hello_zig/index.html"><code class="docutils literal notranslate"><span class="pre">hello_zig</span></code> Hello World in Zig</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../helloxx/index.html"><code class="docutils literal notranslate"><span class="pre">helloxx</span></code> Hello World in C++</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hidkbd/index.html"><code class="docutils literal notranslate"><span class="pre">hidkbd</span></code> USB Host HID keyboard</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../hts221_reader/index.html"><code class="docutils literal notranslate"><span class="pre">hts221_reader</span></code> <code class="docutils literal notranslate"><span class="pre">HTS221</span></code> Humidity Sensor</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../i2cchar/index.html"><code class="docutils literal notranslate"><span class="pre">i2cchar</span></code> Transfer Through I2C</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../i2sloop/index.html"><code class="docutils literal notranslate"><span class="pre">i2sloop</span></code> I2S loopback test</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../igmp/index.html"><code class="docutils literal notranslate"><span class="pre">igmp</span></code> Trivial IGMP</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ina219/index.html"><code class="docutils literal notranslate"><span class="pre">ina219</span></code> Current/Power Monitor INA219</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ina226/index.html"><code class="docutils literal notranslate"><span class="pre">ina226</span></code> Current/Power Monitor INA226</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ini_dumper/index.html"><code class="docutils literal notranslate"><span class="pre">ini_dumper</span></code> ini dumper example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ipcfg/index.html"><code class="docutils literal notranslate"><span class="pre">ipcfg</span></code> IP Configuration file example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../ipforward/index.html"><code class="docutils literal notranslate"><span class="pre">ipforward</span></code> IP Forwarding Using TUN</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../json/index.html"><code class="docutils literal notranslate"><span class="pre">json</span></code> cJSON</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../keyboard/index.html"><code class="docutils literal notranslate"><span class="pre">keyboard</span></code></a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../leds/index.html"><code class="docutils literal notranslate"><span class="pre">leds</span></code> Toggle LEDs</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../leds_rust/index.html"><code class="docutils literal notranslate"><span class="pre">leds_rust</span></code> Toggle LEDs in Rust</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../leds_zig/index.html"><code class="docutils literal notranslate"><span class="pre">leds_zig</span></code> Toggle LEDs in Zig</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../libtest/index.html"><code class="docutils literal notranslate"><span class="pre">libtest</span></code> Static Library Test</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../lis3dsh_reader/index.html"><code class="docutils literal notranslate"><span class="pre">lis3dsh_reader</span></code> <code class="docutils literal notranslate"><span class="pre">LIS3DSH</span></code> Accelerometer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../lp503x/index.html"><code class="docutils literal notranslate"><span class="pre">lp503x</span></code> LP503X PWM LED example</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../lsm303_reader/index.html"><code class="docutils literal notranslate"><span class="pre">lsm303_reader</span></code> <code class="docutils literal notranslate"><span class="pre">LSM303</span></code> Accelerometer/Magnetometer</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="../../lsm6dsl_reader/index.html"><code class="docutils literal notranslate"><span class="pre">lsm6dsl_reader</span></code> <code class="docutils literal notranslate"><span class="pre">LSM6DSL</span></code> Accelerometer/Gyroscope</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../lvglterm/index.html"><code class="docutils literal notranslate"><span class="pre">lvglterm</span></code> LVGL Terminal for NuttShell (NSH)</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../media/index.html"><code class="docutils literal notranslate"><span class="pre">media</span></code> Media test</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../mtdpart/index.html"><code class="docutils literal notranslate"><span class="pre">mtdpart</span></code> MTD Partition Test</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="../../nettest/index.html"><code class="docutils literal notranslate"><span class="pre">nettest</span></code> Client/Server Over TCP</a></li> |
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| <section id="baremetal-hello-world-in-rust"> |
| <h1><cite>baremetal</cite> Hello World in Rust<a class="headerlink" href="#baremetal-hello-world-in-rust" title="Permalink to this heading"></a></h1> |
| <p>This example demonstrates how to create a simple “Hello World” program in Rust for a bare-metal environment. The program is compiled using the <cite>rustc</cite> compiler directly, without relying on any operating system or standard library.</p> |
| <p>The key aspects of this example include:</p> |
| <ul class="simple"> |
| <li><p><strong>No Standard Library</strong>: The program uses the <cite>#![no_std]</cite> attribute, which means it does not link against the standard library. This is essential for bare-metal programming where the standard library is not available.</p></li> |
| <li><p><strong>No Main Function</strong>: The program uses the <cite>#![no_main]</cite> attribute, which indicates that the program does not have a standard <cite>main</cite> function. Instead, it defines a custom entry point.</p></li> |
| <li><p><strong>Panic Handler</strong>: A custom panic handler is defined using the <cite>#[panic_handler]</cite> attribute. This handler is called when a panic occurs, and in this case, it enters an infinite loop to halt the program.</p></li> |
| <li><p><strong>C Interoperability</strong>: The program uses the <cite>extern “C”</cite> block to declare the <cite>printf</cite> function from the C standard library. This allows the Rust program to call C functions directly.</p></li> |
| <li><p><strong>Entry Point</strong>: The <cite>hello_rust_main</cite> function is the entry point of the program. It is marked with <cite>#[no_mangle]</cite> to prevent the Rust compiler from mangling its name, making it callable from C.</p></li> |
| <li><p><strong>Printing</strong>: The program uses the <cite>printf</cite> function to print “Hello, Rust!!” to the console. The <cite>printf</cite> function is called using the <cite>unsafe</cite> block because it involves calling a C function.</p></li> |
| </ul> |
| <p>This example is a great starting point for understanding how to write and compile Rust programs for bare-metal environments, where you have full control over the hardware and no operating system overhead.</p> |
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