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| <div class="section" id="using-the-serial-port-with-mynewt-os"> |
| <h1>Using the Serial Port with Mynewt OS<a class="headerlink" href="#using-the-serial-port-with-mynewt-os" title="Permalink to this headline">¶</a></h1> |
| <p>Some of the projects and tutorials here will allow you to use a serial |
| port to interact with your Mynewt project. While most modern PCs and |
| laptops no longer have a true serial port, almost all can use their USB |
| ports as serial ports.</p> |
| <p>This page will show you how to connect to some of the development boards we |
| use via a serial port.</p> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#using-the-usb-port-on-the-nrf52dk" id="id4">Using the USB port on the nRF52DK</a></p></li> |
| <li><p><a class="reference internal" href="#using-a-usb-to-serial-breakout-board" id="id5">Using a USB to Serial Breakout Board</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#setup-ft232h" id="id6">Setup FT232H</a></p></li> |
| <li><p><a class="reference internal" href="#setup-nordic-semiconductor-nrf52dk" id="id7">Setup Nordic Semiconductor NRF52DK</a></p></li> |
| <li><p><a class="reference internal" href="#setup-arduino-m0-pro" id="id8">Setup Arduino M0 Pro</a></p></li> |
| <li><p><a class="reference internal" href="#setup-serial-communications" id="id9">Setup Serial Communications</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#example-for-mac-os-and-linux-platforms" id="id10">Example for Mac OS and Linux Platforms</a></p></li> |
| <li><p><a class="reference internal" href="#example-for-windows-platforms" id="id11">Example for Windows Platforms</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="section" id="using-the-usb-port-on-the-nrf52dk"> |
| <h2><a class="toc-backref" href="#id4">Using the USB port on the nRF52DK</a><a class="headerlink" href="#using-the-usb-port-on-the-nrf52dk" title="Permalink to this headline">¶</a></h2> |
| <p>The nRF52DK can communicate via a serial port directly through its USB port. By default, it uses the UART onboard, so if you need to use the UART for other purposes, consider using a USB<–>Serial converter or the Segger RTT Console instead, instructions provided below.</p> |
| <p>To see your device, check the USB devices that are connected to your computer (macOS):</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ls<span class="w"> </span>-l<span class="w"> </span>/dev/*USB* |
| <span class="go">crw-rw-rw- 1 <user> None 117, 5 May 9 04:24 /dev/cu.usbmodem1411</span> |
| <span class="go">crw-rw-rw- 1 <user> None 117, 5 May 9 04:24 /dev/tty.usbmodem1411</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">/dev/cu.usbmodem####</span></code> and <code class="docutils literal notranslate"><span class="pre">/dev/tty.usbmodem####</span></code> represent your device. To get console access, you can either use the screen command or Minicom:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>minicom<span class="w"> </span>-D<span class="w"> </span>/dev/tty.usbmodem1411 |
| |
| <span class="go">Welcome to minicom 2.7</span> |
| |
| <span class="go">OPTIONS:</span> |
| <span class="go">Compiled on Apr 26 2018, 13:21:44</span> |
| <span class="go">Port /dev/tty.usbmodem1411, 11:12:13</span> |
| |
| <span class="go">Press Meta-Z for help on special keys</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="using-a-usb-to-serial-breakout-board"> |
| <h2><a class="toc-backref" href="#id5">Using a USB to Serial Breakout Board</a><a class="headerlink" href="#using-a-usb-to-serial-breakout-board" title="Permalink to this headline">¶</a></h2> |
| <p>If you need to use an external USB to Serial converter, this guide will show you how to set it up. The development boards covered here are:</p> |
| <ul class="simple"> |
| <li><p>Nordic Semiconductor nRF52dk</p></li> |
| <li><p>Arduino M0 Pro</p></li> |
| </ul> |
| <p>For this tutorial, we’ll be using the <a class="reference external" href="https://www.adafruit.com/products/2264">AdaFruit FT232H Breakout |
| Board</a>, but almost |
| any similar board should work just as well. You will also need Minicom |
| or a similar Serial communications application. We’ll show you how to |
| use the <code class="docutils literal notranslate"><span class="pre">screen</span></code> command built in to Mac OS X, but later tutorials |
| will also show Minicom setup.</p> |
| <div class="section" id="setup-ft232h"> |
| <h3><a class="toc-backref" href="#id6">Setup FT232H</a><a class="headerlink" href="#setup-ft232h" title="Permalink to this headline">¶</a></h3> |
| <p>This is a great board because it’s so easy to set up, and it can do |
| Serial UART, SPI, I2C and GPIO as well. There’s full documentation on |
| the board |
| <a class="reference external" href="https://learn.adafruit.com/adafruit-ft232h-breakout/overview">here</a> |
| but we’re only covering the wiring for the Serial UART.</p> |
| <p>Start by connecting a jumper wire to Pin D0. This will be the UART Tx |
| pin, which we’ll then connect to the Rx pin on the Development Board.</p> |
| <p>Next connect a jumper wire to pin D1. This will be the UART Rx pin, |
| which we’ll connect to the Tx pin on the development board.</p> |
| <p>Finally connect a jumper wire to the GND pin.</p> |
| <p>It should look like this:</p> |
| <div class="figure align-default" id="id1"> |
| <img alt="FT232H Wiring" src="../_images/ft232h.png" /> |
| <p class="caption"><span class="caption-text">FT232H Wiring</span><a class="headerlink" href="#id1" title="Permalink to this image">¶</a></p> |
| </div> |
| </div> |
| <div class="section" id="setup-nordic-semiconductor-nrf52dk"> |
| <h3><a class="toc-backref" href="#id7">Setup Nordic Semiconductor NRF52DK</a><a class="headerlink" href="#setup-nordic-semiconductor-nrf52dk" title="Permalink to this headline">¶</a></h3> |
| <p>On the NRF52DK developer kit board, the Rx pin is P0.08, so you’ll |
| attach your jumper wire from the Tx pin (D0) of the FT232H board here.</p> |
| <p>The TX Pin is pin P0.06, so you’ll attache the jumper wire from the Rx |
| Pin (D1) on the FT232H board here.</p> |
| <p>Finally, the GND wire should go to the GND Pin on the NRF52DK. When |
| you’re done, your wiring should look like this:</p> |
| <div class="figure align-default" id="id2"> |
| <img alt="NRF52DK Wiring" src="../_images/nrf52dk.png" /> |
| <p class="caption"><span class="caption-text">NRF52DK Wiring</span><a class="headerlink" href="#id2" title="Permalink to this image">¶</a></p> |
| </div> |
| </div> |
| <div class="section" id="setup-arduino-m0-pro"> |
| <h3><a class="toc-backref" href="#id8">Setup Arduino M0 Pro</a><a class="headerlink" href="#setup-arduino-m0-pro" title="Permalink to this headline">¶</a></h3> |
| <p>On the Arduino M0 Pro, the Tx and Rx pins are clearly labeled as such, |
| as is the GND pin. Just make sure you wire Rx from the FT232H to TX on |
| the M0 Pro, and vice-versa.</p> |
| <p>Your Arduino M0 Pro should look like this:</p> |
| <div class="figure align-default" id="id3"> |
| <img alt="Arduino M0 Pro Wiring" src="../_images/m0pro.png" /> |
| <p class="caption"><span class="caption-text">Arduino M0 Pro Wiring</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p> |
| </div> |
| </div> |
| <div class="section" id="setup-serial-communications"> |
| <h3><a class="toc-backref" href="#id9">Setup Serial Communications</a><a class="headerlink" href="#setup-serial-communications" title="Permalink to this headline">¶</a></h3> |
| <p>You will need to know the serial port to connect to and use a terminal |
| program to connect to the board.</p> |
| <div class="section" id="example-for-mac-os-and-linux-platforms"> |
| <h4><a class="toc-backref" href="#id10">Example for Mac OS and Linux Platforms</a><a class="headerlink" href="#example-for-mac-os-and-linux-platforms" title="Permalink to this headline">¶</a></h4> |
| <p>First check what USB devices are already connected before connecting the |
| FT232H board to your computer. The ports are listed in the <strong>/dev</strong> |
| directory and the format of the port name is platform dependent:</p> |
| <ul class="simple"> |
| <li><p>Mac OS uses the format <code class="docutils literal notranslate"><span class="pre">tty.usbserial-<some</span> <span class="pre">identifier></span></code>.</p></li> |
| <li><p>Linux uses the format <code class="docutils literal notranslate"><span class="pre">TTYUSB<N></span></code>, where <code class="docutils literal notranslate"><span class="pre">N</span></code> is a number. For |
| example, TTYUSB2.</p></li> |
| </ul> |
| <p>This example is run on a Mac OS system.</p> |
| <p>Check what USB devices are already connected:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ls<span class="w"> </span>-la<span class="w"> </span>/dev/*usb* |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 63 Nov 23 11:13 /dev/cu.usbmodem401322</span> |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 62 Nov 23 11:13 /dev/tty.usbmodem401322</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>Plug in the FT232H board and check the ports again:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ls<span class="w"> </span>-la<span class="w"> </span>/dev/*usb* |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 63 Nov 23 11:13 /dev/cu.usbmodem401322</span> |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 65 Nov 23 11:26 /dev/cu.usbserial-0020124</span> |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 62 Nov 23 11:13 /dev/tty.usbmodem401322</span> |
| <span class="go">0 crw-rw-rw- 1 root wheel 20, 64 Nov 23 11:26 /dev/tty.usbserial-0020124</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>The FT232H is connected to <code class="docutils literal notranslate"><span class="pre">/dev/tty.usbserial-0020124</span></code> (The number |
| after tty.usbserial will be different on your machine.) Use the screen |
| command to connect to the board:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>screen<span class="w"> </span>/dev/tty.usbserial-0020124<span class="w"> </span><span class="m">115200</span> |
| </pre></div> |
| </div> |
| <p>To exit out of <code class="docutils literal notranslate"><span class="pre">screen</span></code> you’ll type <code class="docutils literal notranslate"><span class="pre">control-A</span></code> followed by |
| <code class="docutils literal notranslate"><span class="pre">control-\</span></code> and you’ll be back to a terminal prompt.</p> |
| <p>You can also use minicom:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>minicom<span class="w"> </span>-D<span class="w"> </span>/dev/tty.usbserial-0020124 |
| |
| <span class="go">Welcome to minicom 2.7</span> |
| |
| <span class="go">OPTIONS:</span> |
| <span class="go">Compiled on Nov 24 2015, 16:14:21.</span> |
| <span class="go">Port /dev/tty.usbserial-0020124, 09:57:17</span> |
| |
| <span class="go">Press Meta-Z for help on special keys</span> |
| </pre></div> |
| </div> |
| <p>If there’s no Mynewt app running, or the Mynewt app doesn’t have the |
| Shell and Console enabled, you won’t see anything there, but you can |
| always refer back to this page from later tutorials if you need to.</p> |
| </div> |
| <div class="section" id="example-for-windows-platforms"> |
| <h4><a class="toc-backref" href="#id11">Example for Windows Platforms</a><a class="headerlink" href="#example-for-windows-platforms" title="Permalink to this headline">¶</a></h4> |
| <p>First check what USB devices are already connected before connecting the |
| FT232H board to your computer. You can locate the ports from a MinGW |
| terminal or use the Windows Device Manager.</p> |
| <p>On a MinGW terminal, the ports are listed in the /dev directory and the |
| format of the port name is <code class="docutils literal notranslate"><span class="pre">ttyS<N></span></code> where N is a number. You must map |
| the port name to a Windows COM port: <code class="docutils literal notranslate"><span class="pre">/dev/ttyS<N></span></code> maps to |
| <code class="docutils literal notranslate"><span class="pre">COM<N+1></span></code>. For example, <code class="docutils literal notranslate"><span class="pre">/dev/ttyS2</span></code> maps to <code class="docutils literal notranslate"><span class="pre">COM3</span></code>.</p> |
| <p>Check what USB devices are already connected:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ls<span class="w"> </span>-l<span class="w"> </span>/dev/ttyS* |
| <span class="go">crw-rw-rw- 1 <user> None 117, 5 May 9 04:24 /dev/ttyS5</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>/dev/ttyS5 maps to the Windows COM6 port. You can run Windows Device |
| Manager to confirm:</p> |
| <p><img alt="Device Manager - USB Devices" src="../_images/device_manager_no_ft232H.png" /></p> |
| <p>Plug in the FT232H board and check the ports again:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>ls<span class="w"> </span>-l<span class="w"> </span>/dev/ttyS* |
| <span class="go">ls -l /dev/ttyS*</span> |
| <span class="go">crw-rw-rw- 1 <user> None 117, 10 May 9 04:55 /dev/ttyS10</span> |
| <span class="go">crw-rw-rw- 1 <user> None 117, 5 May 9 04:55 /dev/ttyS5</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>The FT232H board is connected to port /dev/ttyS10 (or COM11):</p> |
| <p><img alt="Device Manager - FT232H" src="../_images/device_manager_ft232H.png" /></p> |
| <p>We use the PuTTY terminal application to connect to the board on the |
| COM11 port: <img alt="PuTTY" src="../_images/putty.png" /></p> |
| <p>Press Open and you should get a terminal screen titled “COM11 - PuTTY”</p> |
| <p>If there’s no Mynewt app running, or the Mynewt app doesn’t have the |
| Shell and Console enabled, you won’t see anything there, but you can |
| always refer back to this page from later tutorials if you need to.</p> |
| <p>Now that you know how to communicate with your Mynewt application, let’s |
| move on to creating one!</p> |
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