'RuntimeError: Failed to add edge detection' when running script for 2nd time with raspi-gpio 0.6.4

[glynhudson]

Operating system: e.g. Raspbian Stretch
Pi model: Pi 3 Model B+
GPIO Zero version: 1.4.1
Pin factory used: e.g. RPiGPIO

I'm testing a simple GPIO push button script. After a fresh reboot the first time the script is run it works great. However, after stopping the script than trying to run it again I get error RuntimeError: Failed to add edge detection.

Do I need to remove the edge detection interrupt? I though gpiozero should do this automatically? I've tried running the script as root.

I'm experiencing the same as #232 but updating rpi.gpio did not fix the issue, I'm already running the latest version available on Stretch (0.6.4). The issue could be re-occurrence of #38?

Update: I first noticed the issue after updating to the default latest version of rpi-gpio 0.6.4 (released 21st Oct 18), downgrading to rpi-gpio 0.6.3 fixed the issue:

$ sudo pip install RPi.GPIO==0.6.3

How should I proceed with this? As far as I understand this seems to be an issue with rpi-gpio rather than gpiozero? Should I open this issue with rpi-gpio?

Interestingly apt-get is still showing python-rpi.gpio 0.6.4 is still installed:

sudo apt-get install python-rpi.gpio
python-rpi.gpio is already the newest version (0.6.4~stretch-1).

Sorry I don't fuilly understand the between the apt-get package and pip? It seems I've currently got installed pip rpi.gpio==0.6.3 and apt-get python-rpi.gpio=0.6.4

from gpiozero import Button
from signal import pause

print ("Push button test")

def buttonPressLong():
    print ("long press")

def buttonPress():
   print "short press"

push_btn = Button(23, pull_up=False, hold_time=5, bounce_time=0.1)
push_btn.when_pressed = buttonPress
push_btn.when_held = buttonPressLong
   
pause()

Traceback (most recent call last):
  File "push_and_hold.py", line 16, in <module>
    push_btn = Button(23, pull_up=False, hold_time=5, bounce_time=0.1)
  File "/usr/lib/python2.7/dist-packages/gpiozero/devices.py", line 95, in __call__
    self = super(GPIOMeta, cls).__call__(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/gpiozero/input_devices.py", line 303, in __init__
    pin, pull_up, bounce_time, pin_factory=pin_factory
  File "/usr/lib/python2.7/dist-packages/gpiozero/mixins.py", line 338, in __init__
    super(HoldMixin, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/gpiozero/input_devices.py", line 100, in __init__
    self.pin.when_changed = self._fire_events
  File "/usr/lib/python2.7/dist-packages/gpiozero/pins/__init__.py", line 388, in <lambda>
    lambda self, value: self._set_when_changed(value),
  File "/usr/lib/python2.7/dist-packages/gpiozero/pins/pi.py", line 289, in _set_when_changed
    self._enable_event_detect()
  File "/usr/lib/python2.7/dist-packages/gpiozero/pins/rpigpio.py", line 219, in _enable_event_detect
    bouncetime=self._bounce)
RuntimeError: Failed to add edge detection

uname -a
Linux emonpi 4.14.71-v7+ #1145 SMP Fri Sep 21 15:38:35 BST 2018 armv7l GNU/Linux

[bdilloughery]

I have not yet tried as much as you, but I am having the same or a similar issue.

I don't have my Pi handy, as it is in my classroom ... but 33 new raspberry pi's with the current Raspian on them, all get the same errror when I try and run a simple 4 line python program such as:

`
from gpiozero import Button

button = Button(2)

button.wait_for_press()
print("Button was pressed")`

[bcroston]

Are you running your program from the command line or from a GUI (like Idle / Mu / Thonny)?

[bdilloughery]

Running then all in Python 3 IDLE

…

On Sat, Nov 3, 2018, 9:56 AM bcroston ***@***.*** wrote: Are you running your program from the command line or from a GUI (like Idle / Mu / Thonny)? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#687 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AjqL3caA4oAMsgfaIOYJLeqv5vAZ6_Xuks5urcqzgaJpZM4YA6lM> .

[bdilloughery]

... and mine doesn't have a loop. It doesn't even run once On Sat, Nov 3, 2018, 11:01 AM Brendan Dilloughery < brendan.dilloughery@gmail.com wrote:

…

Running then all in Python 3 IDLE On Sat, Nov 3, 2018, 9:56 AM bcroston ***@***.*** wrote: > Are you running your program from the command line or from a GUI (like > Idle / Mu / Thonny)? > > — > You are receiving this because you commented. > Reply to this email directly, view it on GitHub > <#687 (comment)>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AjqL3caA4oAMsgfaIOYJLeqv5vAZ6_Xuks5urcqzgaJpZM4YA6lM> > . >

[bcroston]

EDIT: These steps are no longer relevant

I've fixed it in the latest development RPi.GPIO. To try it (in Raspbian squeeze):

$ sudo apt-get install python-dev python3-dev
$ sudo apt-get install mercurial
$ sudo apt-get install python-pip python3-pip
$ sudo apt-get remove python-rpi.gpio python3-rpi.gpio
$ sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO
$ sudo pip3 install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO

To revert back to the default version in Raspbian:

$ sudo pip uninstall RPi.GPIO
$ sudo pip3 uninstall RPi.GPIO
$ sudo apt-get install python-rpi.gpio python3-rpi.gpio

[glynhudson]

Hi @bcroston,

Thanks, for reply. I've just tried to test. I executed the commads above (omitting the python3 since I'm using 2.7). I managed to succesfully uninstall python-rpi-gpio. However, when I tired to install your dev verson I get the message:

$ sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO
Requirement already satisfied: RPi.GPIO from hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO in /usr/local/lib/python2.7/dist-packages

[bennuttall]

It must still be installed somehow. Perhaps you installed with pip previously? You can try to remove it (sudo apt purge python-rpi.gpio and sudo pip uninstall rpi.gpio) or just force an upgrade: sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO --upgrade

[glynhudson]

Fantastic, I can confirm after upgrading to the dev version of RPi.GPIO 0.6.4 this issue has been fixed:

sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO --upgrade

I can run my example code above to attach an interrupt. Nice work 👍

Will this fixe be merged into the 0.6.4 or 0.6.5 offical release? Would you recomend I continue running 0.6.3 stable until this fix is depolyed?

Why is there both an apt version of rpi-gpio and a pip version? I'm assuming the pip version is easier for you to update since this does not need to go via the package manager.

[bdilloughery]

This fixed all my issues. Thank you bcroston!

I've fixed it in the latest development RPi.GPIO. To try it (in Raspbian squeeze):

$ sudo apt-get install python-dev python3-dev
$ sudo apt-get install mercurial
$ sudo apt-get install python-pip python3-pip
$ sudo apt-get remove python-rpi.gpio python3-rpi.gpio
$ sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO
$ sudo pip3 install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO

To revert back to the default version in Raspbian:

$ sudo pip uninstall RPi.GPIO
$ sudo pip3 uninstall RPi.GPIO
$ sudo apt-get install python-rpi.gpio python3-rpi.gpio

[dlivingstone]

As a note... I had the same issue with one machine only (my own) out of my classroom - which was odd, as they all used the same image initially - so not sure how this happened. The problem affected all gpiozero inputs tried (e.g. distance sensor, button, temperature)

The fixes described above didnt seem to work for me, but a more recent update to latest version of everything has now worked.

There is a workaround that can be employed if you need to know your scripts will re-run reliably on machines that might not have been updated - it requires a bit of editing to the code though.

If you re-write the code so that the button's close method is called,e.g. push_btn.close(), before the end of the program you should be able to re-run. If ctrl-c is required to exit a loop, then you'll also need to add a try/except block of code, and put close in the except block.

[dony71]

why this issue closed? what the solution on this?