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Wiki source code of Control Gateway GPIOs & LEDs

Version 9.1 by Edwin Chen on 2022/05/03 08:59
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1 {{box cssClass="floatinginfobox" title="**Contents**"}}
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4
5 = Products LEDs Mapping =
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8 == Sub-paragraph ==
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12 == Sub-paragraph ==
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16 === Sub-sub paragraph ===
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20
21 = Control LEDs & GPIOs =
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23 == OpenWrt Base OS ==
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25 (% class="box infomessage" id="HControlanGeneralGPIO:" %)
26 (((
27 **Control a General GPIO:**
28
29 **echo 18 > /sys/class/gpio/export**     ~/~/ Export gpio 18 so we can use it
30 **echo "high" > /sys/class/gpio/gpio18/direction**   ~/~/  Set direction to out and
31 set level to high. Use "low" to set direction to output and level to low
32
33 **echo 0 > /sys/class/gpio/gpio18/value**    ~/~/ Set output to 0 or 1
34 **echo "in" > /sys/class/gpio/gpio18/direction**  ~/~/ Set GPIO18 as input
35
36 **cat  /sys/class/gpio/gpio18/value**  ~/~/ Get GPIO18 value if set input
37 )))
38
39 (% class="box infomessage" %)
40 (((
41 **Control a GPIO already exported as SYSTEM LEDs .**
42 **echo 1 > /sys/class/leds/dragino2\:red\:system/brightness**  ~/~/ Turn On LED dragino2:red:system
43 **echo 0 > /sys/class/leds/dragino2\:red\:system/brightness**  ~/~/ Turn off LED dragino2:red:system
44 )))
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46
47 Reference: [[http:~~/~~/www.avrfreaks.net/wiki/index.php/Documentation:Linux/GPIO#gpio-sysfs>>url:http://www.avrfreaks.net/wiki/index.php/Documentation:Linux/GPIO#gpio-sysfs]]