DART-SD410 Android Examples: Difference between revisions
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</pre> | </pre> | ||
You can access the LED device via serial console by: | |||
<pre> | <pre> | ||
$ su | $ su | ||
# cd /sys/class/leds/led1 | # cd /sys/class/leds/led1 | ||
# echo 1 > brightness | # echo 1 > brightness | ||
Writing any value other then 0 will turn the led on | |||
# echo 0 > brightness | # echo 0 > brightness | ||
The led will turn off | The led will turn off | ||
</pre> | |||
You can view available triggers by typing: | |||
<pre> | |||
# cat trigger | |||
The output will be: | |||
[none] boot-indication usb-online mmc0 mmc1 battery-charging-or-full battery-charging battery-full battery-charging-blink-full-solid wlan-indication-led | |||
</pre> | |||
Set the trigger to mmc0 device by typing: | |||
<pre> | |||
# echo mmc0 > trigger | |||
</pre> | |||
Test it by reading mmc0 device: | |||
<pre> | |||
# dd if=/dev/block/mmcblk0 of=/dev/null bs=128 count=1000000 | |||
</pre> | </pre> | ||
Revision as of 09:35, 19 January 2016
DART-SD410 - Using Peripherals
This WIKI describes how to use some simple peripheral devices available on VAR-DT410CustomBoard.
Using User LED1
User LED1 (D6) connected to GPIO21 of the CPU. The LED1 is defined in the apq8016-var-dt410.dtsi file under gpio-leds section.
general1 {
gpios = <&msm_gpio 21 0>;
label = "led1";
linux,default-trigger = "none";
default-state = "off";
retain-state-suspended;
};
You can access the LED device via serial console by:
$ su # cd /sys/class/leds/led1 # echo 1 > brightness Writing any value other then 0 will turn the led on # echo 0 > brightness The led will turn off
You can view available triggers by typing:
# cat trigger The output will be: [none] boot-indication usb-online mmc0 mmc1 battery-charging-or-full battery-charging battery-full battery-charging-blink-full-solid wlan-indication-led
Set the trigger to mmc0 device by typing:
# echo mmc0 > trigger
Test it by reading mmc0 device:
# dd if=/dev/block/mmcblk0 of=/dev/null bs=128 count=1000000