Gpio cleanup in Python

Evil Robot · 26 Mar 2017, 11:13

Hi there!

I get allways this failure message on my Omega2+: IOError: [Errno 16] Resource busy

Do you have an idea, how to do a Gpio cleanup using Python?

Thanks!

T NT · 26 Mar 2017, 13:51

I may be wrong but I think you just call onionGpio._freeGpio()

That is what I get from onionGpio.py anyway.

Evil Robot · 26 Mar 2017, 19:18

Thanks for the hint! You will have to call gpioObject._freeGpio, then it will work.

Michael Lustig · 12 Sept 2017, 12:41

Hello,
also after calling gpioObject._freeGpio
I still get IOError: [Errno 16] Resource busy
please help

Chen Wei-Yu · 31 Oct 2017, 07:43

I use the official python example, and still get IOError: [Errno 16] Resource busy.
After calling gpioObject._freeGpio, the problem still exists.

and I try to use os.system("echo 14>/sys/class/gpio/unexport"), but still fail.

Can anybody help?

Steven Lutz · 2 Jan 2018, 23:43

I really need this to work. Is there any solution to this problem?

Robert Jensen · 3 Jan 2018, 14:49

I'm not near an omega right now so I'm working from memory. I found that I could avoid the resource busy message by using a system call from Python to execute a gpioctl command for control of an output pin. That side-steps the Python library.

Lazar Demin · 3 Jan 2018, 23:07

Ah found a bug in the module code, when setting a GPIO to the output direction, it tries to write 0 to that GPIO by calling the setValue function. In turn, this function tries to get sysfs to export the same GPIO again, causing the error (see https://github.com/OnionIoT/onion-gpio-sysfs/blob/master/python/onionGpio.py#L147).

We'll put out an update to the package, but in the meantime, this can be fixed locally on your Omega if you have the pyOnionGpio package installed. Open /usr/lib/python2.7/onionGpio.py and comment out lines 146 and 147 and it will work.

Paul Smulders · 14 Mar 2018, 14:46

I am having this same problem: the solution modifying the onionGpio.py file (commenting out lines 146 and 147) does not work for me... are there other solutions...?

Paul

Paul Smulders · 14 Mar 2018, 15:05

Update: as a final frustrated attempt..., rebooted Omega2+ (reboot from command line), and all is working again... still a mystery as to how to correct this issue without rebooting...

Cheers,
Paul

Steven Lutz 0 · 22 Nov 2018, 23:26

Does onionGpio._freeGpio() free all gpio ports or just one passed the the function?