Control GPIOs on Up Squared Board

mpetitje · February 2018

Hello,

I am struggling to control the GPIOs of the Up Squared. I tried the MRAA libraries without success (I always get 'Invalid GPIO pin specified' as output). Is MRAA the way to go or is there some other way ? Is any additionnal configuration needed in order to use MRAA ?

I am running ublinux 3.0, and the output of uname -a is

Linux upsquared 4.4.0-ubi4-amd64 #1 SMP Debian 4.4.35-1 (2016-11-29) x86_64 GNU/Linux

Thanks a lot

mpetitje · February 2018

A bit of update: I am able to toggle a GPIO using bash commands:

cd /sys/class/gpio
echo 433 > export
echo out > gpio433
while 1
do  echo 1 > value; sleep 1
echo 0 > value; sleep 1
done

However, I can't a access the same GPIO using MRAA. My hypothesis is that the pinmap is not loaded properly. Indeed, when I run this simple C hello code, I am not able to recognize the board.

#include "mraa.h"
int main(int argc, char** argv)
{
    const char* board_name = mraa_get_platform_name();
    fprintf(stdout, "hello mraa\n Version: %s\n Running on %s\n", mraa_get_version(), board_name);

    mraa_deinit();
    return MRAA_SUCCESS;
}

Javier Arteaga · February 2018

Hi @mpetitje,

Sorry that I didn't see this thread before. As mentioned on the MRAA issue, that kernel simply does not include UP2 support. Please upgrade to ubilinux 4 or the Ubuntu 4.10 upboard kernel line to use MRAA on UP2.