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<h2 id="segger-systemview">SEGGER SystemView</h2>
<p><br> </p>
<h3 id="objective">Objective</h3>
<p>With <a href="https://www.segger.com/systemview.html">SEGGER's SystemView</a> you can "record data from the target system while it is running. The recorded data is analyzed and the system behavior is visualized in different views." </p>
<p><br></p>
<h3 id="hardware-needed">Hardware needed</h3>
<p>You'll need a SEGGER J-Link programmer in order to use this advanced functionality. You might have an external J-Link programmer you're already using, or maybe your board has a dedicated J-Link onboard as some development kits do. Another possibilty is J-Link OB firmware available for some devices like the micro:bit. </p>
<h3 id="software-needed">Software needed</h3>
<ul>
<li>Download <a href="https://www.segger.com/downloads/free-utilities/">SEGGER's SystemView app</a>.</li>
<li>Copy the description file from sys/sysview/SYSVIEW_Mynewt.txt to the /Description/ directory of SystemView</li>
</ul>
<h3 id="setup-the-target">Setup the target</h3>
<p>We'll assume you have an existing example we're enabling SystemView on, in this case <a href="../nRF52/">blinky on nrf52</a>. We can do so with the newt target amend command:</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>newt target amend blink_nordic syscfg=OS_SYSVIEW=1
</code></pre></div>
<p><br></p>
<h3 id="run-the-target-executables">Run the target executables</h3>
<p>Now 'run' the newt target as you'll need an active debugger process to attach to:</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt run blink_nordic 0
App image succesfully generated: ~/Downloads/myproj/bin/targets/blink_nordic/app/apps/bleprph/bleprph.img
Loading app image into slot 1
[~/Downloads/myproj/repos/apache-mynewt-core/hw/bsp/nrf52-thingy/nrf52-thingy_debug.sh ~/Downloads/myproj/repos/apache-mynewt-core/hw/bsp/nrf52-thingy ~/Downloads/myproj/bin/targets/blink_nordic/app/apps/bleprph/bleprph]
Debugging ~/Downloads/myproj/bin/targets/blink_nordic/app/apps/bleprph/bleprph.elf
GNU gdb (GNU Tools for ARM Embedded Processors) 7.8.0.20150604-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later &lt;http://gnu.org/licenses/gpl.html&gt;
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type &quot;show copying&quot;
and &quot;show warranty&quot; for details.
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Reading symbols from ~/Downloads/myproj/bin/targets/blink_nordic/app/apps/bleprph/bleprph.elf...done.
0x000000d8 in ?? ()
Resetting target
0x000000dc in ?? ()
</code></pre></div>
<p><br></p>
<h3 id="launch-the-app">Launch the app</h3>
<p><br>
Launch the app and press <strong>OK</strong> in the System Information dialog box.</p>
<p><img alt="SEGGER SystemView" src="../pics/segger_sysview1.png" /></p>
<p><br></p>
<p>Select ** Target &gt; Start Recording ** and press <strong>OK</strong> in the Configuration dialog box. </p>
<p><img alt="SEGGER SystemView Start Recording" src="../pics/segger_sysview_start_record.png" /></p>
<p><br></p>
<p>You should see the recording for your Mynewt application. </p>
<p><img alt="SEGGER SystemView Recording" src="../pics/segger_sysview_recording.png" /></p>
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