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@@ -26,4 +26,18 @@ Struct Walkthrough
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*x_axis* and *y_axis* fields capture analog input from a joystick, determining direction and speed.
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*x_axis* and *y_axis* fields capture analog input from a joystick, determining direction and speed.
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*nav_bttn* represents a joystick push-button.
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*nav_bttn* represents a joystick push-button.
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*led* allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).
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*led* allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).
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*motor1_rpm_pwm* to *motor4_rpm_pwm* provide individual PWM signals to four DC motors.
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This enables fine-grained speed control, supports differential drive configurations, and even allows for maneuvering in multi-directional platforms like omni-wheel robots.
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Why Use __attribute((packed))?
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The packed attribute tells the compiler not to add any padding between fields in memory. This makes the struct:
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- Compact
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- Predictable for serialization over protocols like UART or ESP-NOW
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- Ideal for low-latency transmission in embedded systems
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This ensures the receiver interprets the exact byte layout you expect, minimizing bandwidth and maximizing compatibility across platforms.
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15
ESP-IDF_Robot/tutorial/docs/build/html/data.html
vendored
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ESP-IDF_Robot/tutorial/docs/build/html/data.html
vendored
@@ -56,6 +56,20 @@ It’s intended to be sent from a transmitting device (like a remote control or
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<p><em>x_axis</em> and <em>y_axis</em> fields capture analog input from a joystick, determining direction and speed.
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<p><em>x_axis</em> and <em>y_axis</em> fields capture analog input from a joystick, determining direction and speed.
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<em>nav_bttn</em> represents a joystick push-button.</p>
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<em>nav_bttn</em> represents a joystick push-button.</p>
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<p><em>led</em> allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).</p>
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<p><em>led</em> allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).</p>
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<p><em>motor1_rpm_pwm</em> to <em>motor4_rpm_pwm</em> provide individual PWM signals to four DC motors.
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This enables fine-grained speed control, supports differential drive configurations, and even allows for maneuvering in multi-directional platforms like omni-wheel robots.</p>
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</section>
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<section id="why-use-attribute-packed">
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<h2>Why Use __attribute((packed))?<a class="headerlink" href="#why-use-attribute-packed" title="Link to this heading">¶</a></h2>
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<p>The packed attribute tells the compiler not to add any padding between fields in memory. This makes the struct:</p>
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<blockquote>
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<div><ul class="simple">
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<li><p>Compact</p></li>
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<li><p>Predictable for serialization over protocols like UART or ESP-NOW</p></li>
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<li><p>Ideal for low-latency transmission in embedded systems</p></li>
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</ul>
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</div></blockquote>
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<p>This ensures the receiver interprets the exact byte layout you expect, minimizing bandwidth and maximizing compatibility across platforms.</p>
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</section>
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</section>
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</section>
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</section>
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@@ -90,6 +104,7 @@ It’s intended to be sent from a transmitting device (like a remote control or
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<li class="toctree-l1"><a class="reference internal" href="overview.html">HOW DOES IT WORK?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="overview.html">HOW DOES IT WORK?</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">DATA STRUCT</a><ul>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">DATA STRUCT</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#struct-walkthrough">Struct Walkthrough</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#struct-walkthrough">Struct Walkthrough</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#why-use-attribute-packed">Why Use __attribute((packed))?</a></li>
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</ul>
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</ul>
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</li>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="transmitter.html">TRANSMITTER</a></li>
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<li class="toctree-l1"><a class="reference internal" href="transmitter.html">TRANSMITTER</a></li>
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@@ -46,6 +46,7 @@
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</li>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="data.html">DATA STRUCT</a><ul>
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<li class="toctree-l1"><a class="reference internal" href="data.html">DATA STRUCT</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="data.html#struct-walkthrough">Struct Walkthrough</a></li>
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<li class="toctree-l2"><a class="reference internal" href="data.html#struct-walkthrough">Struct Walkthrough</a></li>
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<li class="toctree-l2"><a class="reference internal" href="data.html#why-use-attribute-packed">Why Use __attribute((packed))?</a></li>
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</ul>
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</ul>
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</li>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="transmitter.html">TRANSMITTER</a><ul>
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<li class="toctree-l1"><a class="reference internal" href="transmitter.html">TRANSMITTER</a><ul>
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# Sphinx build info version 1
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# Sphinx build info version 1
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# This file records the configuration used when building these files. When it is not found, a full rebuild will be done.
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# This file records the configuration used when building these files. When it is not found, a full rebuild will be done.
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config: 4ff0b7a7d45b83bb7dd9dbbad6843002
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config: b38705e9208fae3c4e0e02be9136bc77
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tags: 62a1e7829a13fc7881b6498c52484ec0
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tags: 62a1e7829a13fc7881b6498c52484ec0
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@@ -97,6 +97,11 @@
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Struct Walkthrough
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Struct Walkthrough
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</a>
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</a>
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</li>
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</li>
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<li class="toctree-l2">
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<a class="reference internal" href="#why-use-attribute-packed">
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Why Use __attribute((packed))?
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</a>
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</li>
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</ul>
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</ul>
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</li>
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</li>
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<li class="toctree-l1">
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<li class="toctree-l1">
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@@ -662,6 +667,52 @@ It’s intended to be sent from a transmitting device (like a remote control
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</em>
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</em>
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allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).
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allows the transmitter to toggle an onboard LED and is used for status indication (e.g. pairing, battery warning, etc).
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</p>
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</p>
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<p>
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<em>
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motor1_rpm_pwm
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</em>
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to
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<em>
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motor4_rpm_pwm
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</em>
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provide individual PWM signals to four DC motors.
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This enables fine-grained speed control, supports differential drive configurations, and even allows for maneuvering in multi-directional platforms like omni-wheel robots.
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</p>
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</section>
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<section id="why-use-attribute-packed">
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<h3>
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Why Use __attribute((packed))?
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<a class="headerlink" href="#why-use-attribute-packed" title="Link to this heading">
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¶
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</a>
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</h3>
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<p>
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The packed attribute tells the compiler not to add any padding between fields in memory. This makes the struct:
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</p>
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<blockquote>
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<div>
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<ul class="simple">
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<li>
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<p>
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Compact
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</p>
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</li>
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<li>
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<p>
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Predictable for serialization over protocols like UART or ESP-NOW
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</p>
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</li>
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<li>
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<p>
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Ideal for low-latency transmission in embedded systems
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</p>
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</li>
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</ul>
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</div>
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</blockquote>
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<p>
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This ensures the receiver interprets the exact byte layout you expect, minimizing bandwidth and maximizing compatibility across platforms.
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</p>
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</section>
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</section>
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</section>
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</section>
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<span id="document-transmitter">
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<span id="document-transmitter">
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