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<h2 id="blinky-your-hello-world-on-nrf52">Blinky, your "Hello World!", on nRF52</h2>
<p><br></p>
<h3 id="objective">Objective</h3>
<p>Learn how to use packages from a default application repository of Mynewt to build your first <em>Hello World</em> application (Blinky) on a target board. Once built using the <em>newt</em> tool, this application will blink the LED lights on the target board.</p>
<p>Create a project with a simple app that blinks an LED on the nRF52 board from Nordic Semiconductors. Download the application to the target and watch it blink!</p>
<p>Note that there are several versions of the nRF52 in the market. The boards tested with this tutorial are listed under "Hardware needed" below.</p>
<p><br></p>
<h3 id="hardware-needed">Hardware needed</h3>
<ul>
<li>nRF52 Development Kit (one of the following)<ul>
<li>Preview Kit from Nordic - PCA 10036</li>
<li>Dev Kit from Nordic - PCA 10040</li>
<li>Eval Kit from Rigado - BMD-300-EVAL-ES</li>
</ul>
</li>
<li>Laptop running Mac OS</li>
<li>It is assumed you have already installed newt tool. </li>
<li>It is assumed you already installed native tools as described <a href="../../get_started/native_tools/">here</a></li>
</ul>
<p><br></p>
<h3 id="install-jlinkexe">Install jlinkEXE</h3>
<p>In order to be able to communicate with the SEGGER J-Link debugger on the dev board, you have to download and install the J-Link GDB Server software on to your laptop. You may download the "Software and documentation pack for Mac OS X" from <a href="https://www.segger.com/jlink-software.html">https://www.segger.com/jlink-software.html</a>. </p>
<p><br></p>
<h3 id="create-a-project">Create a project.</h3>
<p>Create a new project to hold your work. For a deeper understanding, you can read about project creation in
<a href="../../get_started/project_create/">Get Started -- Creating Your First Project</a>
or just follow the commands below.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code> $ mkdir ~/dev
$ cd ~/dev
$ newt new myproj
Downloading project skeleton from apache/incubator-mynewt-blinky...
Installing skeleton in myproj...
Project myproj successfully created.
$ cd myproj
$ newt install -v
apache-mynewt-core
Downloading repository description for apache-mynewt-core... success!
...
apache-mynewt-core successfully installed version 0.7.9-none
</code></pre></div>
<p><br></p>
<h3 id="create-the-targets">Create the targets</h3>
<p>Create two targets - one for the bootloader and one for the nrf52 board. </p>
<p><font color="#F2853F">
Note: The correct bsp must be chosen for the board you are using. </font></p>
<ul>
<li>For the Nordic Preview Dev Kit choose @apache-mynewt-core/hw/bsp/nrf52pdk (as shown below)</li>
<li>For the Nordic Dev Kit choose @apache-mynewt-core/hw/bsp/nrf52dk instead (in the highlighted lines)</li>
<li>For the Rigado Eval Kit choose @apache-mynewt-core/hw/bsp/bmd300eval instead (in the highlighted lines)</li>
</ul>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt target create blink_nordic
$ newt target set blink_nordic app=apps/blinky
<span style="background-color: #ffffcc">$ newt target set blink_nordic bsp=@apache-mynewt-core/hw/bsp/nrf52pdk
</span>$ newt target set blink_nordic build_profile=debug
$ newt target create nrf52_boot
$ newt target set nrf52_boot app=@apache-mynewt-core/apps/boot
<span style="background-color: #ffffcc">$ newt target set nrf52_boot bsp=@apache-mynewt-core/hw/bsp/nrf52pdk
</span>$ newt target set nrf52_boot build_profile=optimized
$ newt target show
targets/blink_nordic
app=apps/blinky
bsp=@apache-mynewt-core/hw/bsp/nrf52pdk
build_profile=debug
targets/nrf52_boot
app=@apache-mynewt-core/apps/boot
bsp=@apache-mynewt-core/hw/bsp/nrf52pdk
build_profile=optimized
</code></pre></div>
<p><br></p>
<h3 id="build-the-target-executables">Build the target executables</h3>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt build nrf52_boot
...
Compiling log_shell.c
Archiving log.a
Linking boot.elf
App successfully built: ~/dev/myproj/bin/nrf52_boot/apps/boot/boot.elf
</code></pre></div>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt build blink_nordic
...
Compiling main.c
Archiving blinky.a
Linking blinky.elf
App successfully built: ~/dev/myproj/bin/blink_nordic/apps/blinky/blinky.elf
</code></pre></div>
<p><br></p>
<h3 id="sign-and-create-the-blinky-application-image">Sign and create the blinky application image</h3>
<p>You must sign and version your application image to download it using newt to the board. Use the newt create-image command to perform this action. 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 blink_nordic 1.0.0
App image successfully generated: ~/dev/myproj/bin/blink_nordic/apps/blinky/blinky.img
Build manifest: ~/dev/myproj/bin/blink_nordic/apps/blinky/manifest.json
</code></pre></div>
<p><br></p>
<h3 id="connect-the-board">Connect the board</h3>
<p>Connect the evaluation board via micro-USB to your PC via USB cable.</p>
<p><br></p>
<h3 id="download-to-the-target">Download to the target</h3>
<p>Download the bootloader first and then the blinky executable to the target platform. Don't forget to reset the board if you don't see the LED blinking right away!</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ newt -v load nrf52_boot
$ newt -v load blink_nordic
</code></pre></div>
<p><br></p>
<p><strong>Note:</strong> If you want to erase the flash and load the image again, you can use JLinkExe to issue an <code>erase</code> command.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>$ JLinkExe -device nRF52 -speed 4000 -if SWD
SEGGER J-Link Commander V5.12c (Compiled Apr 21 2016 16:05:51)
DLL version V5.12c, compiled Apr 21 2016 16:05:45
Connecting to J-Link via USB...O.K.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Mar 15 2016 18:03:17
Hardware version: V1.00
S/N: 682863966
VTref = 3.300V
Type &quot;connect&quot; to establish a target connection, &#39;?&#39; for help
J-Link&gt;erase
Cortex-M4 identified.
Erasing device (0;?i?)...
Comparing flash [100%] Done.
Erasing flash [100%] Done.
Verifying flash [100%] Done.
J-Link: Flash download: Total time needed: 0.363s (Prepare: 0.093s, Compare: 0.000s, Erase: 0.262s, Program: 0.000s, Verify: 0.000s, Restore: 0.008s)
Erasing done.
J-Link&gt;exit
$
</code></pre></div>
<h3 id="conclusion">Conclusion</h3>
<p>You have created, setup, compiled, loaded, and ran your first mynewt application
for an nrf52 board.</p>
<p>We have more fun tutorials for you to get your hands dirty. Be bold and work on the OS with tutorials on <a href="../unit_test/">writing a test suite</a> or try enabling additional functionality such as <a href="../project-target-slinky/">remote comms</a> or <a href="../bletiny_project/">Bluetooth Low Energy</a> on your current board.</p>
<p>If you see anything missing or want to send us feedback, please do so by signing up for appropriate mailing lists on our <a href="../../../community/">Community Page</a>.</p>
<p>Keep on hacking and blinking!</p>
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