Hi Van, I'm runnig my programs with root privileges and this is the /var/log/messages output:
-- 2017-07-12T19:10:32.808475-04:00 blackbox libmraa[4112]: libmraa version v1.5.1 initialised by user 'root' with EUID 0 2017-07-12T19:10:32.812676-04:00 blackbox libmraa[4112]: libmraa initialised for platform 'MinnowBoard MAX' of type 4 -- After that, anymore messages is shown Any other suggerence? 2017-07-12 14:45 GMT-05:00 Van Der Pol, MarkX <markx.van.der....@intel.com>: > Hi Jesus, > > > > The GPIO pins on the Turbot are functional, so I am surprised you are > having such issues. > > > > 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. > > > > 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. > > > > Hope that helps, > > |\/|ark > > > > *From:* elinux-MinnowBoard [mailto:elinux-minnowboard- > boun...@lists.elinux.org] *On Behalf Of *Jesus Velazquez > *Sent:* Thursday, July 6, 2017 2:51 PM > *To:* MinnowBoard Community Email List <elinux-minnowboard@lists. > elinux.org> > *Subject:* Re: [MinnowBoard] GPIO doesn't working as Input > > > > Hi Van, > > > > I have Ubuntu 16.04 with kernel version: > > > > 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 > > > > And I has have test with Pulsar Linux 7 with kernel 3.18.x > > > > My libraries that I use is MRAA Version: v1.7.0-44-gbd3d9d8 ( https:// > iotdk.intel.com/docs/master/mraa/ ) > > > > I have tried with Pins 26, 25, 21, 20 and 14. > > > > This is my code: > > > > --- > > #include "mraa/gpio.h" > > > > int main(){ > > /* initialize MRAA */ > > mraa_init(); > > > > /* create an MRAA digital context */ > > mraa_gpio_context m_gpio = NULL; > > > > /* initialize D2 for use as a digital pin */ > > m_gpio = mraa_gpio_init(26); > > > > /* configure the digital pin as an input */ > > mraa_gpio_dir(m_gpio, MRAA_GPIO_IN); > > /* Set Gpio input mode */ > > mraa_gpio_input_mode(m_gpio, MRAA_GPIO_ACTIVE_LOW); > > > > /* read the value into an integer */ > > int value = mraa_gpio_read(m_gpio); > > > > /* print the value */ > > if (value != 0) > > printf("The button is being pushed %d\n", value); > > else > > printf("The button is not being pushed %d\n", value); > > > > /* now release (close) the pin and exit */ > > mraa_gpio_close(m_gpio); > > return(0); > > } > > > > --- > > Thank you for your help > > > > Jesus V > > > > > > > > 2017-07-06 14:42 GMT-05:00 Van Der Pol, MarkX <markx.van.der....@intel.com > >: > > Hi Jesus, > > Welcome to the list. > > > > 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. > > > > And is it specifically GPIO 26, or are all GPIO’s behaving this way? > > > > Thanks, > > |\/|ark > > > > *From:* elinux-MinnowBoard [mailto:elinux-minnowboard- > boun...@lists.elinux.org] *On Behalf Of *Jesus Velazquez > *Sent:* Wednesday, July 5, 2017 9:14 AM > *To:* elinux-minnowboard@lists.elinux.org > *Subject:* [MinnowBoard] GPIO doesn't working as Input > > > > Hello list, > > > > This is my first post in this list and I'm happy for join me to it. > > > > 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. > > > > If I use the GPIO as output, it works fine and can change the state, but > as Input not. > > > > Somebody have the same experience? or can resolve this issue? > > > > Thanks in advance. > > > > > > > _______________________________________________ > elinux-MinnowBoard mailing list > elinux-MinnowBoard@lists.elinux.org > http://lists.elinux.org/mailman/listinfo/elinux-minnowboard > > > > _______________________________________________ > elinux-MinnowBoard mailing list > elinux-MinnowBoard@lists.elinux.org > http://lists.elinux.org/mailman/listinfo/elinux-minnowboard > >
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