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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 "connect" to establish a target connection, '?' for help |
| J-Link>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>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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