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| <section id="segger-rtt-drivers"> |
| <h1>Segger RTT drivers<a class="headerlink" href="#segger-rtt-drivers" title="Permalink to this heading"></a></h1> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Segger drivers works only with J-Link debug probes. |
| Sometimes it’s possible to replace vendor-specific debug interface |
| with J-Link OB firmware. For details look at |
| <a class="reference external" href="https://www.segger.com/downloads/jlink">Segger website</a></p> |
| </div> |
| <p>Supported Segger drivers:</p> |
| <ul class="simple"> |
| <li><p>Serial over RTT - <code class="docutils literal notranslate"><span class="pre">CONFIG_SERIAL_RTTx</span></code>,</p></li> |
| <li><p>Console over RTT - <code class="docutils literal notranslate"><span class="pre">CONFIG_SERIAL_RTT_CONSOLE_CHANNEL</span></code></p></li> |
| <li><p>Segger SystemView - <code class="docutils literal notranslate"><span class="pre">CONFIG_SEGGER_SYSVIEW</span></code></p></li> |
| <li><p>Note RTT - <code class="docutils literal notranslate"><span class="pre">CONFIG_NOTE_RTT</span></code></p></li> |
| </ul> |
| <section id="segger-systemview"> |
| <h2>Segger SystemView<a class="headerlink" href="#segger-systemview" title="Permalink to this heading"></a></h2> |
| <ol class="arabic"> |
| <li><p>Steps to enable SystemView support:</p></li> |
| <li><p>Make sure your architecture supports a high-performance counter. |
| In most cases it will be:</p> |
| <p><span class="menuselection">CONFIG_ARCH_PERF_EVENTS=y</span></p> |
| <p>In that case, the the architecture logic must initialize the perf counter |
| with <code class="docutils literal notranslate"><span class="pre">up_perf_init()</span></code>.</p> |
| </li> |
| <li><p>Enable instrumentation support:</p> |
| <p><span class="menuselection">CONFIG_SCHED_INSTRUMENTATION=y</span></p> |
| </li> |
| <li><p>Configure instrumentation support. Available options for SystemView are:</p> |
| <p><span class="menuselection">CONFIG_SCHED_INSTRUMENTATION_SWITCH=y</span></p> |
| <p><span class="menuselection">CONFIG_SCHED_INSTRUMENTATION_SYSCALL=y</span></p> |
| <p><span class="menuselection">CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER=y</span></p> |
| </li> |
| <li><p>Make sure that <code class="docutils literal notranslate"><span class="pre">CONFIG_TASK_NAME_SIZE</span> <span class="pre">></span> <span class="pre">0</span></code>, otherwise task/thread |
| names will not be displayed correctly</p></li> |
| <li><p>Enable Note Driver support and disable Note RAM driver:</p> |
| <p><span class="menuselection">CONFIG_DRIVERS_NOTE=y</span></p> |
| <p><span class="menuselection">CONFIG_DRIVERS_NOTERAM=n</span></p> |
| </li> |
| <li><p>Enable Note RTT and Segger SystemView support:</p> |
| <p><span class="menuselection">CONFIG_NOTE_RTT=y</span></p> |
| <p><span class="menuselection">CONFIG_SEGGER_SYSVIEW=y</span></p> |
| </li> |
| <li><p>Configure RTT channel and RTT buffer size for SystemView:</p> |
| <p><span class="menuselection">CONFIG_SEGGER_SYSVIEW_RTT_CHANNEL=0</span></p> |
| <p><span class="menuselection">CONFIG_SEGGER_SYSVIEW_RTT_BUFFER_SIZE=1024</span></p> |
| <p>In case SystemView returns buffer overflow errors, you should increase |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_NOTE_RTT_BUFFER_SIZE_UP</span></code>.</p> |
| </li> |
| </ol> |
| <ol class="arabic simple" start="2"> |
| <li><p>Use SystemView for heap tracing:</p></li> |
| </ol> |
| <p>Refer to example configuration at <code class="docutils literal notranslate"><span class="pre">stm32f429i-disco/configs/systemview</span></code>. |
| Make sure that <code class="docutils literal notranslate"><span class="pre">CONFIG_SCHED_INSTRUMENTATION_HEAP</span></code> is enabled.</p> |
| <p>Example of screenshot from SystemView:</p> |
| <a class="reference internal image-reference" href="../../../_images/sysview.png"><img alt="../../../_images/sysview.png" class="align-center" src="../../../_images/sysview.png" style="width: 800px;" /></a> |
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