<div dir="ltr"><div>Hi Van,</div><div><br></div><div>I'm runnig my programs with root privileges and this is the /var/log/messages output:</div><div><br></div><div>--<br></div><div>2017-07-12T19:10:32.808475-04:00 blackbox libmraa[4112]: libmraa version v1.5.1 initialised by user 'root' with EUID 0<br>2017-07-12T19:10:32.812676-04:00 blackbox libmraa[4112]: libmraa initialised for platform 'MinnowBoard MAX' of type 4</div><div><br></div><div>--</div><div><br></div><div>After that, anymore messages is shown</div><div><br></div><div>Any other suggerence?</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-07-12 14:45 GMT-05:00 Van Der Pol, MarkX <span dir="ltr"><<a href="mailto:markx.van.der.pol@intel.com" target="_blank">markx.van.der.pol@intel.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" vlink="purple" link="blue">
<div class="m_-7530185976838672853WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hi Jesus,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">The GPIO pins on the Turbot are functional, so I am surprised you are having such issues.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">One thing that comes to mind is that the MRAA libraries are expecting to have root privileges, so make sure you either execute you program with a ‘sudo’ context
( as in, if your program is called ‘test_gpio’, you execute ‘sudo test_gpio’ to elevate the program to run with root permissions), or log in as root.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">You can also examine the syslog messages to see what MRAA is reporting –certain MRAA error conditions logged there. For instance on Ubuntu ‘cat /var/log/syslog’
to see the whole log.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hope that helps,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">|\/|ark<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> elinux-MinnowBoard [mailto:<a href="mailto:elinux-minnowboard-bounces@lists.elinux.org" target="_blank">elinux-minnowboard-<wbr>bounces@lists.elinux.org</a>]
<b>On Behalf Of </b>Jesus Velazquez<br>
<b>Sent:</b> Thursday, July 6, 2017 2:51 PM<br>
<b>To:</b> MinnowBoard Community Email List <<a href="mailto:elinux-minnowboard@lists.elinux.org" target="_blank">elinux-minnowboard@lists.<wbr>elinux.org</a>><br>
<b>Subject:</b> Re: [MinnowBoard] GPIO doesn't working as Input<u></u><u></u></span></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">Hi Van,<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">I have Ubuntu 16.04 with kernel version:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#263238">Linux blackbox 4.4.0-81-generic #104-Ubuntu SMP Wed Jun 14 08:17:06 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#263238">And I has have test with Pulsar Linux 7 with kernel 3.18.x</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#263238">My libraries that I use is MRAA Version: v1.7.0-44-gbd3d9d8 ( </span><span style="color:#263238"><a href="https://iotdk.intel.com/docs/master/mraa/" target="_blank">https://<wbr>iotdk.intel.com/docs/master/<wbr>mraa/</a>
)</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="color:#263238">I have tried with Pins 26, 25, 21, 20 and 14.</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="color:#263238">This is my code:</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="color:#263238">---</span><u></u><u></u></p>
</div>
<div>
<pre>#include "mraa/gpio.h"<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>int main(){<u></u><u></u></pre>
<pre> /* initialize MRAA */<u></u><u></u></pre>
<pre> mraa_init();<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* create an MRAA digital context */<u></u><u></u></pre>
<pre> mraa_gpio_context m_gpio = NULL;<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* initialize D2 for use as a digital pin */<u></u><u></u></pre>
<pre> m_gpio = mraa_gpio_init(26);<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* configure the digital pin as an input */<u></u><u></u></pre>
<pre> mraa_gpio_dir(m_gpio, MRAA_GPIO_IN);<u></u><u></u></pre>
<pre> /* Set Gpio input mode */<u></u><u></u></pre>
<pre> mraa_gpio_input_mode(m_gpio, MRAA_GPIO_ACTIVE_LOW);<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* read the value into an integer */<u></u><u></u></pre>
<pre> int value = mraa_gpio_read(m_gpio);<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* print the value */<u></u><u></u></pre>
<pre> if (value != 0)<u></u><u></u></pre>
<pre> printf("The button is being pushed %d\n", value);<u></u><u></u></pre>
<pre> else<u></u><u></u></pre>
<pre> printf("The button is not being pushed %d\n", value);<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre> /* now release (close) the pin and exit */<u></u><u></u></pre>
<pre> mraa_gpio_close(m_gpio);<u></u><u></u></pre>
<pre> return(0);<u></u><u></u></pre>
<pre>}<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>---<u></u><u></u></pre>
</div>
<div>
<p class="MsoNormal"><span style="color:#263238">Thank you for your help</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><span style="color:#263238">Jesus V</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">2017-07-06 14:42 GMT-05:00 Van Der Pol, MarkX <<a href="mailto:markx.van.der.pol@intel.com" target="_blank">markx.van.der.pol@intel.com</a>>:<u></u><u></u></p>
<blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hi Jesus,
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Welcome to the list.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Please let me know the OS and libraries you are using to access the GPIO pin in question, and what
program you use to test the GPIO state.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">And is it specifically GPIO 26, or are all GPIO’s behaving this way?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Thanks,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">|\/|ark
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> elinux-MinnowBoard [mailto:<a href="mailto:elinux-minnowboard-bounces@lists.elinux.org" target="_blank">elinux-minnowboard-<wbr>bounces@lists.elinux.org</a>]
<b>On Behalf Of </b>Jesus Velazquez<br>
<b>Sent:</b> Wednesday, July 5, 2017 9:14 AM<br>
<b>To:</b> <a href="mailto:elinux-minnowboard@lists.elinux.org" target="_blank">elinux-minnowboard@lists.<wbr>elinux.org</a><br>
<b>Subject:</b> [MinnowBoard] GPIO doesn't working as Input</span><u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<p class="MsoNormal">Hello list,<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">This is my first post in this list and I'm happy for join me to it.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">I have a Minnowboard Turbot and I would like to manage a GPIO as input but I can see that my pin (26 for example) always is in HIGH state and the interruption never is active. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">If I use the GPIO as output, it works fine and can change the state, but as Input not.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Somebody have the same experience? or can resolve this issue?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Thanks in advance.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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</div>
<p class="MsoNormal"><u></u> <u></u></p>
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