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| <li>» <a href="os/tutorials/blinky/">Project Blinky</a></li> |
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| |
| <h2 id="enabling-the-console-and-shell-for-blinky">Enabling The Console and Shell for Blinky</h2> |
| <p>This tutorial shows you how to add the Console and Shell to the Blinky application and interact with it over a serial line connection. |
| <br></p> |
| <h3 id="prerequisites">Prerequisites</h3> |
| <ul> |
| <li>Work through one of the Blinky Tutorials to create and build a Blinky application for one of the boards.</li> |
| <li>Have a <a href="/os/get_started/serial_access.md">serial setup</a>.</li> |
| </ul> |
| <p><br></p> |
| <h3 id="use-an-existing-project">Use an Existing Project</h3> |
| <p>Since all we're doing is adding the shell and console capability to blinky, we assume |
| that you have worked through at least some of the other tutorials, and have an existing project. |
| For this example, we'll be modifying the <a href="../nRF52/">blinky on nrf52</a> project to enable |
| the shell and console connectivity. You can use blinky on a different board.</p> |
| <p><br></p> |
| <h3 id="modify-the-dependencies-and-configuration">Modify the Dependencies and Configuration</h3> |
| <p>Add the following dependencies to your application target's <code>pkg.yml</code> file:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps: |
| - "@apache-mynewt-core/sys/console/full" |
| - "@apache-mynewt-core/sys/shell" |
| - "@apache-mynewt-core/sys/sysinit" |
| </code></pre></div> |
| |
| <p>This lets the newt system know that it needs to pull in the code for the console and the shell.</p> |
| <p>Modify the system configuration settings to enable Shell and Console ticks and prompt. Add the following to your application target's <code>syscfg.yml</code> file:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>syscfg.vals: |
| # Enable the shell task. |
| SHELL_TASK: 1 |
| # Enable Console OS Ticks |
| CONSOLE_TICKS: 1 |
| # Enable Console Prompt |
| CONSOLE_PROMPT: 1 |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="use-the-os-default-event-queue-to-process-blinky-timer-and-shell-events">Use the OS Default Event Queue to Process Blinky Timer and Shell Events</h3> |
| <p>Mynewt creates a main task that executes the application <code>main()</code> function. It also creates an OS default event queue that packages can use to queue their events. Shell uses the OS default event queue for Shell events, and <code>main()</code> can process the events in the context of the main task. </p> |
| <p>Blinky's main.c is very simple. It only has a <code>main()</code> function that executes an infinite loop to toggle the LED and sleep for one second. We will modify blinky:</p> |
| <ul> |
| <li>To use os_callout to generate a timer event every one second instead of sleeping. The timer events are added to the OS default event queue.</li> |
| <li>To process events from the OS default event queue inside the infinite loop in <code>main()</code>.</li> |
| </ul> |
| <p>This allows the main task to process both Shell events and the timer events to toggle the LED from the OS default event queue.</p> |
| <p><br></p> |
| <h3 id="modify-mainc">Modify main.c</h3> |
| <p>Initialize a os_callout timer and move the toggle code from the while loop in <code>main()</code> to the event callback function. Add the following code above the <code>main()</code> function:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/* The timer callout */</span> |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">os_callout</span> <span style="color: #000000">blinky_callout</span>; |
| |
| <span style="color: #177500">/*</span> |
| <span style="color: #177500"> * Event callback function for timer events. It toggles the led pin.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">void</span> <span style="color: #000000">timer_ev_cb</span>(<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">os_event</span> <span style="color: #000000">*ev</span>) |
| { |
| <span style="color: #000000">assert</span>(<span style="color: #000000">ev</span> <span style="color: #000000">!=</span> <span style="color: #A90D91">NULL</span>); |
| |
| <span style="color: #000000">++g_task1_loops</span>; |
| <span style="color: #000000">hal_gpio_toggle</span>(<span style="color: #000000">g_led_pin</span>); |
| |
| <span style="color: #000000">os_callout_reset</span>(<span style="color: #000000">&blinky_callout</span>, <span style="color: #000000">OS_TICKS_PER_SEC</span>); |
| } |
| |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">void</span> <span style="color: #000000">init_timer</span>(<span style="color: #A90D91">void</span>) |
| { |
| <span style="color: #177500">/*</span> |
| <span style="color: #177500"> * Initialize the callout for a timer event.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #000000">os_callout_init</span>(<span style="color: #000000">&blinky_callout</span>, <span style="color: #000000">os_eventq_dflt_get</span>(), |
| <span style="color: #000000">timer_ev_cb</span>, <span style="color: #A90D91">NULL</span>); |
| |
| <span style="color: #000000">os_callout_reset</span>(<span style="color: #000000">&blinky_callout</span>, <span style="color: #000000">OS_TICKS_PER_SEC</span>); |
| |
| } |
| </code></pre></div> |
| |
| <p>In <code>main()</code>, add the call to the <code>init_timer()</code> function before the while loop and modify the while loop to process events from the OS default event queue:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #000000">main</span>(<span style="color: #A90D91">int</span> <span style="color: #000000">argc</span>, <span style="color: #A90D91">char</span> <span style="color: #000000">**argv</span>) |
| { |
| |
| <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>; |
| |
| <span style="color: #633820">#ifdef ARCH_sim</span> |
| <span style="color: #000000">mcu_sim_parse_args</span>(<span style="color: #000000">argc</span>, <span style="color: #000000">argv</span>); |
| <span style="color: #633820">#endif</span> |
| |
| <span style="color: #000000">sysinit</span>(); |
| |
| <span style="color: #000000">g_led_pin</span> <span style="color: #000000">=</span> <span style="color: #000000">LED_BLINK_PIN</span>; |
| <span style="color: #000000">hal_gpio_init_out</span>(<span style="color: #000000">g_led_pin</span>, <span style="color: #1C01CE">1</span>); |
| <span style="color: #000000">init_timer</span>(); |
| <span style="color: #A90D91">while</span> (<span style="color: #1C01CE">1</span>) { |
| <span style="color: #000000">os_eventq_run</span>(<span style="color: #000000">os_eventq_dflt_get</span>()); |
| } |
| <span style="color: #000000">assert</span>(<span style="color: #1C01CE">0</span>) |
| <span style="color: #A90D91">return</span> <span style="color: #000000">rc</span>; |
| } |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="build-the-blinky-application-target">Build the Blinky Application Target</h3> |
| <p>We're not going to build the bootloader here since we are assuming that you have already |
| built and loaded it during previous tutorials.</p> |
| <p>Run the <code>newt build nrf52_blinky</code> command to build the Blinky application:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt build nrf52_blinky |
| |
| ... |
| |
| Archiving util_mem.a |
| Linking ~/dev/myproj/bin/targets/nrf52_blinky/app/apps/blinky/blinky.elf |
| Target successfully built: targets/nrf52_blinky |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="sign-and-create-the-blinky-application-image">Sign and Create the Blinky Application Image</h3> |
| <p>Run the <code>newt create-image nrf52_blinky 1.0.0</code> command to create and sign the application image. You may assign an arbitrary version (e.g. 1.0.0) to the image.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt create-image nrf52_blinky 1.0.0 |
| App image succesfully generated: ~/dev/myproj/bin/targets/nrf52_blinky/app/apps/blinky/blinky.img |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="load-the-image">Load the Image</h3> |
| <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>Run the <code>newt load nrf52_blinky</code> command to load the Blinky application image onto the board.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt load nrf52_blinky |
| Loading app image into slot 1 |
| </code></pre></div> |
| |
| <p><br></p> |
| <h3 id="set-up-a-serial-connection">Set Up a Serial Connection</h3> |
| <p>You'll need a Serial connection to see the output of your program. You can reference the <a href="../../get_started/serial_access/">Serial Port Setup</a> Tutorial for more information on setting up your serial communication.</p> |
| <p><br></p> |
| <h3 id="communicate-with-the-application">Communicate with the Application</h3> |
| <p>Once you have a connection set up, you can connect to your device as follows:</p> |
| <ul> |
| <li> |
| <p>On Mac OS and Linux platforms, you can run <code>minicom -D /dev/tty.usbserial-<port> -b 115200</code> to connect to the console of your app. Note that on Linux, the format of the port name is <code>/dev/ttyUSB<N></code>, where N is a number.</p> |
| </li> |
| <li> |
| <p>On Windows, you can use a terminal application such as PuTTY to connect to the device.</p> |
| <p>If you located your port from a MinGW terminal, the port name format is <code>/dev/ttyS<N></code>, where <code>N</code> 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>You can also use the Windows Device Manager to locate the COM port.</p> |
| </li> |
| </ul> |
| <p><br> |
| To test and make sure that the Shell is running, first just hit <return>:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>3534: > |
| </code></pre></div> |
| |
| <p>You can try some commands:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>3609: > ? |
| Commands: |
| 8841: echo ? prompt ticks tasks mempools |
| 8843: date b |
| 8844: > ticks off |
| Console Ticks off |
| > prompt off |
| Prompt now off. |
| ticks on |
| 33383: Console Ticks on |
| |
| 33568: |
| prompt on |
| 39108: Prompt now on. |
| 39108: > |
| </code></pre></div> |
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