Detect SW4 (Power Button) +

sopifore

I am looking for a way to detect the power button has been pressed. I am refering to the small button near the barrel power jack. On the OPiPC it is on the end of the board, between the microSD slot and the barrel power kack.


Is there a way to detect the switch state? I would like to detect SW4 has been pressed and script an action.

majsi

Hi, SW4 is connected to PL3. You can check state of PL3.

leonidy-85

gpio read PL3
[digitalRead2162] the pin:-1 is invaild,please check it over!
0

snowbody

I was able to read out PL3

I explained this in a new thread, because the same technique can be applied to other gpio ports as well.

In order to read the switch, you have to set the control register of port PL3 to input first.
You can read out the data-register for port PL3 afterward.

have a look under the thread -- I included two scripts -- one to set the register -- another to read the register
Pressing the switch key will change the value of the read-register script.

--thread= data / control register (example onboard switch)

Dermenslof

work perfect.TIPS:

if you want configure PL3 as INPUT on boot
just modify your script.bin as:

1. [gpio_para]
   
2. gpio_used = 1
   
3. gpio_num = 20                                                            
   
4. gpio_pin_1 = port:PL10<1><default><default><0>
   
5. //...
   
6. gpio_pin_20 = port:PL03<0><default><default><1>      

Copy code

and you can check the status of PL03 with:

$> cat /sys/class/gpio_sw/PL3/data

now my question:
i can not find where the switch SW2 is connected. (OPI2)
any help?