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| <div class="section" id="use-hci-access-to-nimble-controller"> |
| <h1>Use HCI access to NimBLE controller<a class="headerlink" href="#use-hci-access-to-nimble-controller" title="Permalink to this headline">¶</a></h1> |
| <p>This tutorial explains how to use the example application <code class="docutils literal notranslate"><span class="pre">blehci</span></code> |
| included in the NimBLE stack to talk to the Mynewt NimBLE controller via |
| the Host Controller Interface. You may build the Mynewt image using a |
| laptop running any OS of your choice - Mac, Linux, or Windows.</p> |
| <p>The host used in this specific example is the BlueZ Bluetooth stack. |
| Since BlueZ is a Bluetooth stack for Linux kernel-based family of |
| operating system, the tutorial expects a computer running Linux OS and |
| with BlueZ installed to talk to the board with the Mynewt image.</p> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#prerequisites" id="id1">Prerequisites</a></p></li> |
| <li><p><a class="reference internal" href="#create-a-project" id="id2">Create a project</a></p></li> |
| <li><p><a class="reference internal" href="#create-targets" id="id3">Create targets</a></p></li> |
| <li><p><a class="reference internal" href="#build-targets" id="id4">Build targets</a></p></li> |
| <li><p><a class="reference internal" href="#create-the-app-image" id="id5">Create the app image</a></p></li> |
| <li><p><a class="reference internal" href="#load-the-bootloader-and-the-application-image" id="id6">Load the bootloader and the application image</a></p></li> |
| <li><p><a class="reference internal" href="#establish-serial-connection" id="id7">Establish serial connection</a></p></li> |
| <li><p><a class="reference internal" href="#open-bluetooth-monitor-btmon" id="id8">Open Bluetooth monitor btmon</a></p></li> |
| <li><p><a class="reference internal" href="#attach-the-blehci-device-to-bluez" id="id9">Attach the blehci device to BlueZ</a></p></li> |
| <li><p><a class="reference internal" href="#start-btmgmt-to-send-commands" id="id10">Start btmgmt to send commands</a></p></li> |
| </ul> |
| </div> |
| <div class="section" id="prerequisites"> |
| <h2><a class="toc-backref" href="#id1">Prerequisites</a><a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h2> |
| <p>Ensure that you meet the following prerequisites before continuing with |
| one of the tutorials.</p> |
| <ul class="simple"> |
| <li><p>Have Internet connectivity to fetch remote Mynewt components.</p></li> |
| <li><p>Have a board with BLE radio that is supported by Mynewt. We will use |
| an nRF52 Dev board in this tutorial.</p></li> |
| <li><p>Have a USB TTL Serial Cable that supports hardware flow control such |
| as ones found at |
| <a class="reference external" href="http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm">http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm</a> to establish |
| a serial USB connection between the board and the laptop.</p></li> |
| <li><p>Install the newt tool and toolchains (See <a class="reference internal" href="../../get_started/index.html"><span class="doc">Basic |
| Setup</span></a>).</p></li> |
| <li><p>Install a BLE host such as BlueZ on a Linux machine to talk to the |
| nRF52 board running Mynewt. Use <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">apt-get</span> <span class="pre">install</span> <span class="pre">bluez</span></code> to |
| install it on your Linux machine.</p></li> |
| </ul> |
| </div> |
| <div class="section" id="create-a-project"> |
| <h2><a class="toc-backref" href="#id2">Create a project</a><a class="headerlink" href="#create-a-project" title="Permalink to this headline">¶</a></h2> |
| <p>Use the newt tool to create a new project directory containing a |
| skeletal Mynewt framework. Change into the newly created directory.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ newt new blehciproj |
| Downloading project skeleton from apache/mynewt-blinky... |
| Installing skeleton in blehciproj ... |
| Project blehciproj successfully created. |
| $ cd mblehciproj |
| |
| $ newt upgrade |
| Downloading repository mynewt-core (commit: master) ... |
| apache-mynewt-core successfully upgraded to version 1.7.0 |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="create-targets"> |
| <h2><a class="toc-backref" href="#id3">Create targets</a><a class="headerlink" href="#create-targets" title="Permalink to this headline">¶</a></h2> |
| <p>You will create two targets - one for the bootloader, the other for the |
| application. Then you will add the definitions for them. Note that you |
| are using the example app <code class="docutils literal notranslate"><span class="pre">blehci</span></code> for the application target. Set the |
| bsp to nordic_pca10040.</p> |
| <p><strong>NOTE:</strong> The preview version, nRF52PDK, is no longer supported. If you |
| do not see PCA100040 on the top of your board, you have a preview |
| version of the board and will need to upgrade your developer board |
| before continuing.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ newt target create nrf52_boot |
| $ newt target set nrf52_boot app=@mcuboot/boot/mynewt |
| $ newt target set nrf52_boot bsp=@apache-mynewt-core/hw/bsp/nordic_pca10040 |
| $ newt target set nrf52_boot build_profile=optimized |
| </pre></div> |
| </div> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ newt target create myble2 |
| $ newt target set myble2 bsp=@apache-mynewt-core/hw/bsp/nordic_pca10040 |
| $ newt target set myble2 app=@apache-mynewt-nimble/apps/blehci |
| $ newt target set myble2 build_profile=optimized |
| </pre></div> |
| </div> |
| <p>Check that the targets are defined correctly.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ newt target show |
| targets/my_blinky_sim |
| app=apps/blinky |
| bsp=@apache-mynewt-core/hw/bsp/native |
| build_profile=debug |
| targets/myble2 |
| app=@apache-mynewt-nimble/apps/blehci |
| bsp=@apache-mynewt-core/hw/bsp/nordic_pca10040 |
| build_profile=optimized |
| targets/nrf52_boot |
| app=@mcuboot/boot/mynewt |
| bsp=@apache-mynewt-core/hw/bsp/nordic_pca10040 |
| build_profile=optimized |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="build-targets"> |
| <h2><a class="toc-backref" href="#id4">Build targets</a><a class="headerlink" href="#build-targets" title="Permalink to this headline">¶</a></h2> |
| <p>Then build the two targets.</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>build<span class="w"> </span>nrf52_boot |
| <span class="go"><snip></span> |
| <span class="go">Linking ~/dev/blehciproj/bin/targets/nrf52_boot/app/boot/mynewt/mynewt.elf</span> |
| <span class="go">Target successfully built: targets/nrf52_boot</span> |
| |
| <span class="gp">$ </span>newt<span class="w"> </span>build<span class="w"> </span>myble2 |
| <span class="go"><snip></span> |
| <span class="go">Linking ~/dev/blehciproj/bin/targets/myble2/app/apps/blehci/blehci.elf</span> |
| <span class="go">Target successfully built: targets/myble2</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="create-the-app-image"> |
| <h2><a class="toc-backref" href="#id5">Create the app image</a><a class="headerlink" href="#create-the-app-image" title="Permalink to this headline">¶</a></h2> |
| <p>Generate a signed application image for the <code class="docutils literal notranslate"><span class="pre">myble2</span></code> target. The |
| version number is arbitrary.</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>create-image<span class="w"> </span>myble2<span class="w"> </span><span class="m">1</span>.0.0 |
| <span class="go">App image succesfully generated: ~/dev/blehciproj/bin/targets/myble2/app/apps/blehci/blehci.img</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="load-the-bootloader-and-the-application-image"> |
| <h2><a class="toc-backref" href="#id6">Load the bootloader and the application image</a><a class="headerlink" href="#load-the-bootloader-and-the-application-image" title="Permalink to this headline">¶</a></h2> |
| <p>Make sure the USB connector is in place and the power LED on the board |
| is lit. Use the Power ON/OFF switch to reset the board after loading the |
| image.</p> |
| <p>Load the bootloader:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>load<span class="w"> </span>nrf52_boot |
| <span class="go">Loading bootloader</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| <p>Load the application image:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>newt<span class="w"> </span>load<span class="w"> </span>myble2 |
| <span class="go">Loading app image into slot 1</span> |
| <span class="gp">$</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="establish-serial-connection"> |
| <h2><a class="toc-backref" href="#id7">Establish serial connection</a><a class="headerlink" href="#establish-serial-connection" title="Permalink to this headline">¶</a></h2> |
| <p>Attach a serial port to your board by connecting the USB TTL Serial |
| Cable. This should create /dev/ttyUSB0 (or similar) on your machine.</p> |
| <p><strong>Note</strong> Certain Linux OS versions have been observed to detect the |
| nrf52 board as a mass storage device and the console access doesn’t work |
| properly. In that case try powering the nrf52 board from your monitor or |
| something other than your Linux computer/laptop when you set up the |
| serial port for HCI communication.</p> |
| </div> |
| <div class="section" id="open-bluetooth-monitor-btmon"> |
| <h2><a class="toc-backref" href="#id8">Open Bluetooth monitor btmon</a><a class="headerlink" href="#open-bluetooth-monitor-btmon" title="Permalink to this headline">¶</a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">btmon</span></code> is a BlueZ test tool to display all HCI commands and events in |
| a human readable format. Start the btmon tool in a terminal window.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ sudo btmon |
| [sudo] password for admin: |
| Bluetooth monitor ver 5.37 |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="attach-the-blehci-device-to-bluez"> |
| <h2><a class="toc-backref" href="#id9">Attach the blehci device to BlueZ</a><a class="headerlink" href="#attach-the-blehci-device-to-bluez" title="Permalink to this headline">¶</a></h2> |
| <p>In a different terminal, attach the blehci device to the BlueZ daemon |
| (substitute the correct /dev filename for ttyUSB0).</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ sudo btattach -B /dev/ttyUSB0 -S 1000000 |
| Attaching BR/EDR controller to /dev/ttyUSB0 |
| Switched line discipline from 0 to 15 |
| Device index 1 attached |
| </pre></div> |
| </div> |
| <p>The baud rate used to connect to the controller may be changed by |
| overriding the default value of 1000000 in the |
| <code class="docutils literal notranslate"><span class="pre">net/nimble/transport/uart/syscfg.yml</span></code>. Settings in the serial |
| transport <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file can be overridden by a higher priority |
| package such as the application. So, for example, you may set the |
| <code class="docutils literal notranslate"><span class="pre">BLE_HCI_UART_BAUD</span></code> to a different value in |
| <code class="docutils literal notranslate"><span class="pre">apps/blehci/syscfg.yml</span></code>.</p> |
| <p>If there is no CTS/RTS lines present in the test environment, flow |
| control should be turned off. This can be done with -N option for |
| btattach. <strong>Note:</strong> -N option came with BlueZ ver 5.44. |
| Also, modify the value of <code class="docutils literal notranslate"><span class="pre">BLE_HCI_UART_FLOW_CTRL</span></code> in the |
| <code class="docutils literal notranslate"><span class="pre">nimble/transport/uart/syscfg.yml</span></code> to <code class="docutils literal notranslate"><span class="pre">HAL_UART_FLOW_CTL_NONE</span></code>.</p> |
| </div> |
| <div class="section" id="start-btmgmt-to-send-commands"> |
| <h2><a class="toc-backref" href="#id10">Start btmgmt to send commands</a><a class="headerlink" href="#start-btmgmt-to-send-commands" title="Permalink to this headline">¶</a></h2> |
| <p>In a third terminal, start btmgmt. This tool allows you to send commands |
| to the blehci controller. Use the index number that shows up when you |
| <code class="docutils literal notranslate"><span class="pre">btattach</span></code> in the previous step.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ sudo btmgmt --index 1 |
| [sudo] password for admin: |
| </pre></div> |
| </div> |
| <p>Set your device address (you can substitute any static random address |
| here).</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[hci1]# static-addr cc:11:11:11:11:11 |
| Static address successfully set |
| </pre></div> |
| </div> |
| <p>Initialize the controller.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[hci1]# power on |
| hci1 Set Powered complete, settings: powered le static-addr |
| </pre></div> |
| </div> |
| <p>Begin scanning.</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>[hci1]# find -l |
| Discovery started |
| hci1 type 6 discovering on |
| hci1 dev_found: 58:EF:77:C8:8D:17 type LE Random rssi -78 flags 0x0000 |
| AD flags 0x06 |
| eir_len 23 |
| <snip> |
| </pre></div> |
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