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Gpio pin already exist Exception [message #1609501]

Tue, 10 February 2015 06:36

manikandan panchabihesan

Messages: 3
Registered: February 2015

Junior Member

I am working on kura in that blinking LED light by using pi4j with gpio in raspberry pi. But it is working first time.When running second time i got the below error,

com.pi4j.io.gpio.exception.GpioPinExistsException: This GPIO pin already exists: GPIO 1
com.pi4j.io.gpio.impl.GpioControllerImpl.provisionPin(GpioControllerImpl.java:507)
com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalOutputPin(GpioControllerImpl.java:645)
com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalOutputPin(GpioControllerImpl.java:672)

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Re: Gpio pin already exist Exception [message #1614169 is a reply to message #1609501]

Fri, 13 February 2015 04:34

manikandan panchabihesan

Messages: 3
Registered: February 2015

Junior Member

I found out the solution,

add below line,

gpio.unProvisioning(pin);

at the end ... Its really working...

[Updated on: Fri, 13 February 2015 04:34]

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Re: Gpio pin already exist Exception [message #1614992 is a reply to message #1614169]

Fri, 13 February 2015 16:32

Luca Dazi

Messages: 15
Registered: December 2014

Junior Member

Hello,
that kind of issue is dued to the fact that both jdk.dio and pi4j will not acquire a GPIO pin if it is already exported to the user space.
Unprovisioning (or Closing) the pin once it is no more needed is a best practice when dealing with GPIOs.

By the way, starting from Kura 1.1.0, you can use the provided jdk.dio library instead of pi4j.

Luca

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