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| <div class="section" id="segger-rtt-console"> |
| <h1>SEGGER RTT Console<a class="headerlink" href="#segger-rtt-console" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="objective"> |
| <h2>Objective<a class="headerlink" href="#objective" title="Permalink to this headline">¶</a></h2> |
| <p>Sometimes you dont have UART on your board, or you want to use it for |
| something else while still having newt logs/shell capability. With |
| <a class="reference external" href="https://www.segger.com/jlink-rtt.html">SEGGER’s RTT</a> capability you |
| can swap UART for RTT, which is a very high-speed memory-mapped I/O.</p> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#hardware-needed" id="id1">Hardware needed</a></p></li> |
| <li><p><a class="reference internal" href="#setup-the-target" id="id2">Setup the target</a></p></li> |
| <li><p><a class="reference internal" href="#run-the-target-executables" id="id3">Run the target executables</a></p></li> |
| <li><p><a class="reference internal" href="#connect-to-console" id="id4">Connect to console</a></p></li> |
| </ul> |
| </div> |
| <div class="section" id="hardware-needed"> |
| <h3><a class="toc-backref" href="#id1">Hardware needed</a><a class="headerlink" href="#hardware-needed" title="Permalink to this headline">¶</a></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> |
| </div> |
| <div class="section" id="setup-the-target"> |
| <h3><a class="toc-backref" href="#id2">Setup the target</a><a class="headerlink" href="#setup-the-target" title="Permalink to this headline">¶</a></h3> |
| <p>We’ll assume you have an existing project with some kind of |
| console/shell like <a class="reference internal" href="../blinky/blinky_console.html"><span class="doc">Blinky with console and shell</span></a> |
| that we’re switching over to RTT from UART.</p> |
| <p><strong>Note:</strong> We have tested RTT with J-Link version V6.14h. We recommend |
| that you upgrade your J-Link if you have an earlier version of J-Link |
| installed. Earlier versions of J-Link use the BUFFER_SIZE_DOWN value |
| defined in hw/drivers/rtt/include/rtt/SEGGER_RTT_Conf.h for the |
| maximum number of input characters. If an input line exceeds the |
| BUFFER_SIZE_DOWN number of characters, RTT ignores the extra |
| characters. The default value is 16 characters. For example, this limit |
| causes shell commands with more than 16 characters of input to fail. You |
| may set the Mynewt <code class="docutils literal notranslate"><span class="pre">RTT_BUFFER_SIZE_DOWN</span></code> syscfg setting in your |
| target to increase this value if you do not upgrade your J-Link version.</p> |
| <p>We can disable uart and enable rtt with the newt target command:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">newt target amend nrf52_blinky syscfg=CONSOLE_UART=0</span> |
| <span class="go">newt target amend nrf52_blinky syscfg=CONSOLE_RTT=1</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="run-the-target-executables"> |
| <h3><a class="toc-backref" href="#id3">Run the target executables</a><a class="headerlink" href="#run-the-target-executables" title="Permalink to this headline">¶</a></h3> |
| <p>Now ‘run’ the newt target as you’ll need an active debugger process to |
| attach to:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>run<span class="w"> </span>nrf52_blinky<span class="w"> </span><span class="m">0</span> |
| <span class="go">App image succesfully generated: ~/Downloads/myapp1/bin/targets/nrf52_blinky/app/apps/blinky/blinky.img</span> |
| <span class="go">Loading app image into slot 1</span> |
| <span class="go">[~Downloads/myapp1/repos/apache-mynewt-core/hw/bsp/nrf52-thingy/nrf52-thingy_debug.sh ~/Downloads/myapp1/repos/apache-mynewt-core/hw/bsp/nrf52-thingy ~/Downloads/myapp1/bin/targets/nrf52_blinky/app/apps/blinky/blinky]</span> |
| <span class="go">Debugging ~/Downloads/myapp1/bin/targets/nrf52_blinky/app/apps/blinky/blinky.elf</span> |
| <span class="go">GNU gdb (GNU Tools for ARM Embedded Processors) 7.8.0.20150604-cvs</span> |
| <span class="go">Copyright (C) 2014 Free Software Foundation, Inc.</span> |
| <span class="go">License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html></span> |
| <span class="go">This is free software: you are free to change and redistribute it.</span> |
| <span class="go">There is NO WARRANTY, to the extent permitted by law. Type "show copying"</span> |
| <span class="go">and "show warranty" for details.</span> |
| <span class="go">This GDB was configured as "--host=x86_64-apple-darwin10 --target=arm-none-eabi".</span> |
| <span class="go">Type "show configuration" for configuration details.</span> |
| <span class="go">For bug reporting instructions, please see:</span> |
| <span class="go"><http://www.gnu.org/software/gdb/bugs/>.</span> |
| <span class="go">Find the GDB manual and other documentation resources online at:</span> |
| <span class="go"><http://www.gnu.org/software/gdb/documentation/>.</span> |
| <span class="go">For help, type "help".</span> |
| <span class="go">Type "apropos word" to search for commands related to "word"...</span> |
| <span class="go">Reading symbols from ~/Downloads/myapp1/bin/targets/nrf52_blinky/app/apps/blinky/blinky.elf...done.</span> |
| <span class="go">0x000000d8 in ?? ()</span> |
| <span class="go">Resetting target</span> |
| <span class="go">0x000000dc in ?? ()</span> |
| <span class="gp gp-VirtualEnv">(gdb)</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="connect-to-console"> |
| <h3><a class="toc-backref" href="#id4">Connect to console</a><a class="headerlink" href="#connect-to-console" title="Permalink to this headline">¶</a></h3> |
| <p>In a seperate terminal window <code class="docutils literal notranslate"><span class="pre">telnet</span> <span class="pre">localhost</span> <span class="pre">19021</span></code> and when you |
| continue your gdb session you should see your output. If you’re not |
| familiar with telnet, when you’re ready to exit you may by using the |
| hotkey ctrl+] then typing quit</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>telnet<span class="w"> </span>localhost<span class="w"> </span><span class="m">19021</span> |
| <span class="go">Trying ::1...</span> |
| <span class="go">telnet: connect to address ::1: Connection refused</span> |
| <span class="go">Trying fe80::1...</span> |
| <span class="go">telnet: connect to address fe80::1: Connection refused</span> |
| <span class="go">Trying 127.0.0.1...</span> |
| <span class="go">Connected to localhost.</span> |
| <span class="go">Escape character is '^]'.</span> |
| <span class="go">SEGGER J-Link V6.14e - Real time terminal output</span> |
| <span class="go">SEGGER J-Link EDU V8.0, SN=268006294</span> |
| <span class="go">Process: JLinkGDBServer</span> |
| </pre></div> |
| </div> |
| <p>Then you can interact with the device:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">stat</span> |
| <span class="go">stat</span> |
| <span class="go">000262 Must specify a statistic name to dump, possible names are:</span> |
| <span class="go">000262 stat</span> |
| <span class="go">000262 compat></span> |
| </pre></div> |
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