Your Smart IOT

<p>Yay you have finally moved on from 8-bit chips and are ready to try out some 32-bit hotness! Those ARM Cortex chips look fun, some have built in bluetooth, or 2.4ghz radios, or usb…all you have to do is learn how to program them.</p>
<h1><span id="openocd" class="anchor-link-target"></span>OpenOCD</h1>
<p>On your way to learning how to use your favorite new ARM Cortex you may have heard of <a href="http://openocd.org/" target="_blank">OpenOCD</a>. OpenOCD is the software that we will use to do the actual programming of chips. Unlike the AVR ISP programming protocol, every ARM chip is significantly different to program, with platform-unique commands, flash locations, fuse bits, settings, etc. Teasing out those details is a struggle and if you change chips you have to start all over <em>even if both chips are, say, Cortex-M3 based! </em></p>
<p>Each chip fab tends to supply its own programming software – Atmel has Atmel Studio, Nordic has NRFGo, ST has ST Link – but often times that software is Windows only.</p>
<p>OpenOCD is great because its cross platform, open source, and has support for a vast number of chips & programmers.</p>
<p>You can use OpenOCD with dongle-programmers such as J-Link and ST-Link or even an FTDI chip. But, if you have a spare <a href="http://ift.tt/1o7SsLh" itemprop="url" target="_bank" title="Raspberry"><strong>Raspberry</strong></a> Pi (and who doesn’t these days?) you can use it as a native OpenOCD programmer with just a few wires.</p>
<p>It’s also really <em>fast</em> to program chips natively, and if you have to program a mess of chips, it can make things speedy – an extra 30 seconds adds up when you’re doing 1000!</p>
<p> </p>
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<h1 class="headline"><span id="compiling-openocd">Compiling OpenOCD</span></h1>
<div class="author">by <a href="http://ift.tt/1RHJnR8" target="_blank">lady ada</a></div>
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<p>Compiling OpenOCD takes about 15 minutes but is worth the effort to get the latest code. You’ll  need to have command line access and a Pi on the Internet so you can download packages and software.</p>
<p>Thanks to <a href="http://ift.tt/1TgkGAF" target="_blank">http://ift.tt/1TgkGAF</a> for the great tutorial, we’re just adapting it for Pi usage!</p>
<h1>Compiling OpenOCD</h1>
<p>Start by doing a fresh <strong>sudo apt-get update</strong> this will make sure you have the latest packages and repository set up.</p>
<p>Next, run</p>
<p><strong>sudo apt-get install git autoconf libtool make pkg-config libusb-1.0-0 libusb-1.0-0-dev</strong></p>
<p>to install all the tools you’ll need to compile OpenOCD. OpenOCD changes a lot and is under constant development so we do suggest compiling your own!</p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1RHJnRa" target="_blank"><img alt="raspberry_pi_1aptget.png" class="31305-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1TgkFwG" srcset="http://ift.tt/1RHJo7q 260x, http://ift.tt/1TgkFwL 640x, http://ift.tt/1TgkFwG 800x, http://ift.tt/1RHJo7s 1024x" /></a></div>
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<p>Download the latest source code for OpenOCD with</p>
<p><strong>git clone git://git.code.sf.net/p/openocd/code openocd-code</strong></p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1TgkFNf" target="_blank"><img alt="raspberry_pi_3gitclone.png" class="31307-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1RHJo7C" srcset="http://ift.tt/1TgkG3y 260x, http://ift.tt/1RHJo7G 640x, http://ift.tt/1RHJo7C 800x, http://ift.tt/1TgkG3A 1024x" /></a></div>
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<p>Change into the code directory and run the bootstrapper with:</p>
<p><strong>cd openocd-code</strong><br />
<strong>./bootstrap</strong></p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1RHJr3a" target="_blank"><img alt="raspberry_pi_4bootstrap.png" class="31308-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1TgkHo4" srcset="http://ift.tt/1RHJoo9 260x, http://ift.tt/1TgkHoa 640x, http://ift.tt/1TgkHo4 800x, http://ift.tt/1RHJoEs 1024x" /></a></div>
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<p>Next, we will compile OpenOCD with the Raspberry Pi native GPIO twiddling support – this will work on various Raspberry Pi’s despite being called ‘bcm2835gpio’</p>
<p><strong>./configure –enable-sysfsgpio –enable-bcm2835gpio</strong></p>
<p>If you’re following this guide on a non-Pi embedded linux board, you can skip the <strong>–enable-bcm2835gpio</strong> part and try to just use sysfsgpio. Sysfsgpio is much slower than native GPIO twiddling but it may not matter too much in your application.</p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1TgkG3M" target="_blank"><img alt="raspberry_pi_8configing.png" class="31309-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1RHJoEu" srcset="http://ift.tt/1TgkHol 260x, http://ift.tt/1RHJoEw 640x, http://ift.tt/1RHJoEu 800x, http://ift.tt/1TgkHEG 1024x" /></a></div>
<div class="row-fluid build-image"><a href="http://ift.tt/1RHJoED" target="_blank"><img alt="raspberry_pi_9configed.png" class="31310-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1TgkHEN" srcset="http://ift.tt/1RHJrjM 260x, http://ift.tt/1TgkHET 640x, http://ift.tt/1TgkHEN 800x, http://ift.tt/1RHJoEJ 1024x" /></a></div>
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<p>Note that when done, it wont mention GPIO support in the configuration summary, thats OK!</p>
<p>Run <strong>make</strong></p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1TgkHVd" target="_blank"><img alt="raspberry_pi_10making.png" class="31311-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1RHJrjV" srcset="http://ift.tt/1TgkHVf 260x, http://ift.tt/1RHJrAa 640x, http://ift.tt/1RHJrjV 800x, http://ift.tt/1TgkHVk 1024x" /></a></div>
<div class="row-fluid build-image"><a href="http://ift.tt/1RHJrAe" target="_blank"><img alt="raspberry_pi_11compiled.png" class="31312-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1TgkJfG" srcset="http://ift.tt/1RHJoV5 260x, http://ift.tt/1TgkJfK 640x, http://ift.tt/1TgkJfG 800x, http://ift.tt/1RHJoV9 1024x" /></a></div>
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<p>Assuming compilation completes successfully as above, you can install with</p>
<p><strong>sudo make install</strong></p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1TgkHVo" target="_blank"><img alt="raspberry_pi_12installed.png" class="31314-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="http://ift.tt/1RHJrAn" srcset="http://ift.tt/1TgkIbC 260x, http://ift.tt/1RHJpbw 640x, http://ift.tt/1RHJrAn 800x, http://ift.tt/1TgkIbE 1024x" /></a></div>
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<p>That’s pretty much it!</p>
<p>You can see the list of interfaces available in<strong>/usr/local/share/openocd/scripts/interface</strong></p>
<p>There’s a <em>lot</em> of options, in particular check out <strong>raspberrypi2-native.cfg</strong> and <strong>raspberrypi-native.cfg</strong> if you are interested in using OpenOCD with a non-Pi, loot at <strong>sysfsgpio-raspberrypi.cfg</strong>which can help you port to a different linux computer</p>
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<div class="row-fluid build-image"><a href="http://ift.tt/1RHJrQM" target="_blank"><img alt="raspberry_pi_13interfaces.png" class="31315-asset img-responsive" sizes="(max-width: 768px) 100vw, (max-width: 1024px) 65vw, (max-width: 1365px) 47vw, 750px" src="https://learn.adafruit.com/system/assets/assets/000/031/315/medium800/raspberry_pi_13interfaces.png?1458140041" srcset="https://learn.adafruit.com/system/assets/assets/000/031/315/medium260/raspberry_pi_13interfaces.png?1458140041 260x, https://learn.adafruit.com/system/assets/assets/000/031/315/medium640/raspberry_pi_13interfaces.png?1458140041 640x, https://learn.adafruit.com/system/assets/assets/000/031/315/medium800/raspberry_pi_13interfaces.png?1458140041 800x, https://learn.adafruit.com/system/assets/assets/000/031/315/large1024/raspberry_pi_13interfaces.png?1458140041 1024x" /></a></div>
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Programming Microcontrollers using OpenOCD on a Raspberry Pi

Yay you have finally moved on from 8-bit chips and are ready to try out some 32-bit hotness! Those ARM Cortex chips look fun, some have buil...

Programming Microcontrollers using OpenOCD on a Raspberry Pi

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