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| <h1 id="using-the-serial-port-with-mynewt-os">Using the Serial Port with Mynewt OS</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 will show you how to connect to some of the development boards |
| we use via a serial port. </p> |
| <p>The development boards covered here are:</p> |
| <ul> |
| <li>Nordic Semiconductor NRF52dk</li> |
| <li>Arduino M0 Pro</li> |
| </ul> |
| <p>In order to communicate with these boards you will also need a USB<-->Serial |
| converted. We'll be using the <a href="https://www.adafruit.com/products/2264">AdaFruit FT232H Breakout Board</a> for |
| this, 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>screen</code> command built in to Mac OS X, but later tutorials will |
| also show Minicom setup.</p> |
| <p>So let's get started!</p> |
| <p><br></p> |
| <h2 id="setup-ft232h">Setup FT232H</h2> |
| <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 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> |
| <p><img alt="FT232H Wiring" src="../pics/ft232h.png" /></p> |
| <p><br></p> |
| <h2 id="setup-nordic-semiconductor-nrf52dk">Setup Nordic Semiconductor NRF52DK</h2> |
| <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> |
| <p><img alt="NRF52DK Wiring" src="../pics/nrf52dk.png" /> </p> |
| <p><br></p> |
| <h2 id="setup-arduino-m0-pro">Setup Arduino M0 Pro</h2> |
| <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> |
| <p><img alt="Arduino M0 Pro Wiring" src="../pics/m0pro.png" /></p> |
| <p><br></p> |
| <h2 id="setup-serial-communications">Setup Serial Communications</h2> |
| <p>You will need to know the serial port to connect to and use a terminal program to connect to the board.</p> |
| <h3 id="example-for-mac-os-and-linux-platforms">Example for Mac OS and Linux Platforms</h3> |
| <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> |
| <li>Mac OS uses the format <code>tty.usbserial-<some identifier></code>. </li> |
| <li>Linux uses the format <code>TTYUSB<N></code>, where <code>N</code> is a number. For example, TTYUSB2.</li> |
| </ul> |
| <p><br> |
| This example is run on a Mac OS system. </p> |
| <p>Check what USB devices are already connected: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ ls -la /dev/*usb* |
| 0 crw-rw-rw- 1 root wheel 20, 63 Nov 23 11:13 /dev/cu.usbmodem401322 |
| 0 crw-rw-rw- 1 root wheel 20, 62 Nov 23 11:13 /dev/tty.usbmodem401322 |
| $ |
| </code></pre></div> |
| |
| <p><br> |
| Plug in the FT232H board and check the ports again: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ ls -la /dev/*usb* |
| 0 crw-rw-rw- 1 root wheel 20, 63 Nov 23 11:13 /dev/cu.usbmodem401322 |
| 0 crw-rw-rw- 1 root wheel 20, 65 Nov 23 11:26 /dev/cu.usbserial-0020124 |
| 0 crw-rw-rw- 1 root wheel 20, 62 Nov 23 11:13 /dev/tty.usbmodem401322 |
| 0 crw-rw-rw- 1 root wheel 20, 64 Nov 23 11:26 /dev/tty.usbserial-0020124 |
| $ |
| </code></pre></div> |
| |
| <p><br> |
| The FT232H is connected to <code>/dev/tty.usbserial-0020124</code> (The number after tty.usbserial will be different on your machine.) |
| <br> |
| Use the screen command to connect to the board: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ screen /dev/tty.usbserial-0020124 115200 |
| </code></pre></div> |
| |
| <p><br> |
| To exit out of <code>screen</code> you'll type <code>control-A</code> followed by <code>control-\</code> and you'll |
| be back to a terminal prompt.</p> |
| <p><br></p> |
| <p>You can also use minicom: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ minicom -D /dev/tty.usbserial-0020124 |
| |
| Welcome to minicom 2.7 |
| |
| OPTIONS: |
| Compiled on Nov 24 2015, 16:14:21. |
| Port /dev/tty.usbserial-0020124, 09:57:17 |
| |
| Press Meta-Z for help on special keys |
| </code></pre></div> |
| |
| <p><br> |
| 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><br></p> |
| <h3 id="example-for-windows-platforms">Example for Windows Platforms</h3> |
| <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>ttyS<N></code> where N is a number. You must map the port name to a Windows COM port: <code>/dev/ttyS<N></code> maps to <code>COM<N+1></code>. For example, <code>/dev/ttyS2</code> maps to <code>COM3</code>.</p> |
| <p>Check what USB devices are already connected: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ls -l /dev/ttyS* |
| crw-rw-rw- 1 <user> None 117, 5 May 9 04:24 /dev/ttyS5 |
| $ |
| </code></pre></div> |
| |
| <p><br> |
| /dev/ttyS5 maps to the Windows COM6 port. You can run Windows Device Manager to confirm:</p> |
| <p><br> |
| <img alt="Device Manager - USB Devices" src="/os/tutorials/pics/device_manager_no_ft232H.png" /></p> |
| <p><br></p> |
| <p>Plug in the FT232H board and check the ports again: |
| <br></p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ls -l /dev/ttyS* |
| ls -l /dev/ttyS* |
| crw-rw-rw- 1 <user> None 117, 10 May 9 04:55 /dev/ttyS10 |
| crw-rw-rw- 1 <user> None 117, 5 May 9 04:55 /dev/ttyS5 |
| $ |
| </code></pre></div> |
| |
| <p><br> |
| The FT232H board is connected to port /dev/ttyS10 (or COM11):</p> |
| <p><br> |
| <img alt="Device Manager - FT232H" src="/os/tutorials/pics/device_manager_ft232H.png" /></p> |
| <p><br></p> |
| <p>We use the PuTTY terminal application to connect to the board on the COM11 port: |
| <br> |
| <img alt="PuTTY" src="/os/tutorials/pics/putty.png" /></p> |
| <p><br></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><br></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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