[MinnowBoard] GPIO doesn't working as Input

[Jesus Velazquez]

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.pol at 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-
> bounces at lists.elinux.org] *On Behalf Of *Jesus Velazquez
> *Sent:* Wednesday, July 5, 2017 9:14 AM
> *To:* elinux-minnowboard at 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 at lists.elinux.org
> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>
>
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