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GPIO PinStatusListener [message #1843351]

Sat, 24 July 2021 13:59

Ravi Teja Lavu

Messages: 1
Registered: July 2021

Junior Member

I got the instance of pin by
KuraGPIOPin pin = gpioService.getPinByTerminal(address, direction, mode, trigger);
followed by the pin.open();
and here are the direction, mode and trigger options used -
KuraGPIODirection.INPUT, KuraGPIOMode.INPUT_PULL_UP, KuraGPIOTrigger.NONE

when I added PinStatusListener to this instance I get UnSupportedOperationException.
java.lang.UnsupportedOperationException: Cannot start notification
at com.oracle.dio.gpio.impl.GPIOPinImpl.setInputListener(GPIOPinImpl.java:186)
at org.eclipse.kura.linux.gpio.JdkDioPin.addPinStatusListener(JdkDioPin.java:127)
The documentation says that it is allowed for GPIO type input. I am able to read the value of the pin, so the pin instance is working fine. Did it work for anyone?

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Re: GPIO PinStatusListener [message #1843418 is a reply to message #1843351]

Wed, 28 July 2021 15:24

Pierantonio Merlino

Messages: 39
Registered: March 2016

Member

Hi,

the Kura GPIOService is based on the JdkDio library that interacts with the underlying OS. I could be possible that some GPIOs doesn't support listeners at OS level, so trying to register a listener causes an UnsupportedOperation exception.

Try to take a look at the GPIO example for further info about the code.
Moreover, I noticed that you set KuraGPIOTrigger.NONE, but in this way the listener will not be activated by an event on the pin.

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