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!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History

!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|VersionIssue Date!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue DateNotes|-| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{oldid|14083|2021/07/16}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First DESK-MX6-L release|-| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{oldid|17005|2022/03/03}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |DESK-MX6-L 3.0.0 release|-!| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |{{oldid|17064|2022/10/04}}| style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:white#000000"|NotesAdd libgpiod example

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drwxr-xr-x 2 root root 0 Apr 28 2 2020 2022 .drwxr-xr-x 54 58 root root 0 Apr 28 2 2020 2022 ..lrwxrwxrwx 1 root root 0 Apr 28 2 2020 2022 mmc0:: -> ../../devices/soc0platform/soc/2100000.aips-bus/2190000.usdhcmmc/leds/mmc0::lrwxrwxrwx 1 root root 0 Apr 28 2 2020 2022 mmc1:: -> ../../devices/soc0platform/soc/2100000.aips-bus/2194000.usdhcmmc/leds/mmc1::lrwxrwxrwx 1 root root 0 Apr 28 2 2020 2022 rs232_485_422 -> ../../devices/soc0platform/leds/leds/rs232_485_422lrwxrwxrwx 1 root root 0 Apr 28 2 2020 2022 rs232_on -> ../../devices/soc0platform/leds/leds/rs232_onroot@desk-mx6:~#

===== Additional information =====Information about GPIOs usage under <code>sysfs </code> directory ''https://www.kernel.org/doc/Documentation/gpio/sysfs.txt''

==== Usage with [https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/README libgpiod] ==== {{WarningMessage|text=''sysfs'' GPIO ABI has been deprecated. See more inofrmation information [https://www.kernel.org/doc/Documentation/gpio/sysfs.rst here] about it. A character device access has to be used, more information [https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/ here]}}

===== libgpiod example =====It is possible yo cross-compile <code>libgpiod</code> in the target (if the related Yocto package is not available for installation). Once the ''autoconf-archive'' package has been installed<pre>dnf install autoconf-archive</pre> it is possible to clone the <code>libgpiod</code> git repository and compile the related sources: <pre>git clone https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.gitcd libgpiod ./autogen.sh --enable-tools=yes --prefix=/usr/local makemake install</pre> Once installed, the <code>gpio</code> utilities are availabel in the target: <pre class="workstation-terminal">root@desk-mx6:~# gpiogpiodetect gpiofind gpioget gpioinfo gpiomon gpioset</pre> ===== gpio interrupt example =====If a push button, with proper pull-up, is connected to a GPIO line available - for example using the J33.34 pin available on [[AXEL_Lite_SOM/AXEL_Lite_Evaluation_Kit/Interfaces_and_Connectors/WIDE | SBC AXEL Lite WIDE]] connector - the related GPIO can be used as an interrupt: * J33.40 is connected to J10.40 SOM pin ** J33 connector is the WIDE connector in the [[AXEL_Lite_SOM/AXEL_Lite_Evaluation_Kit | AXEL Lite EVK]]** J10 connector is the SO-DIMM connector in the AXEL Lite EVK** ALT-5 alternate function for this pin is <code>GPIO1_IO06</code>* the corresponding pin number is 0 6* <code>gpiomon</code> utility can be used for monitor the pin status and triggering, for example, the ''falling-edge'' event: <pre class="workstation-terminal">root@desk-mx6:~# gpiomon --falling-edge 0 6event: FALLING EDGE offset: 6 timestamp: [ 696.463539802]event: FALLING EDGE offset: 6 timestamp: [ 696.643661944]^Croot@desk-mx6:~#</pre> <section end="Body" />