Piface Digital 2  - InterruptEnableException

Hi,

This error is due to changes in the new version of Raspbian. The latest package (>v4.1.2)  for python-pifacecommon should fix it. There might be a slight delay as it makes it way through the mirrors, but once that happens, doing a

sudo apt-get update

sudo apt-get install python{,3}-pifacecommon

should fix it.

Regards

Andrew

Hi Andrew

I finally received the Pi2 and as you predicted the pifacecommon update resolved the problem.

I can now run blink1 and all is fine. I then tried to create a very basic script which set up the input interrupts as per the example and then switch an output on and off based on the status of an input. (When input 1 is pressed then turn on Output 1). This works fine using the GPIO, but not with piface. I have included the script below. I receive an Attribute error: 'int' object has no attribute 'chip'. I am well out of my depth here and no doubt I am making a very obvious error. Your help would be greatly appreciated.

from time import sleep

import pifacedigitalio

DELAY = 0.5  # seconds

pfd = pifacedigitalio.PiFaceDigital() # creates a PiFace Digtal object

def switch_pressed(event):

    event.chip.output_pins[event.pin_num].turn_on()

def switch_unpressed(event):

    event.chip.output_pins[event.pin_num].turn_off()

if __name__ == "__main__":

    pifacedigital = pifacedigitalio.PiFaceDigital()

    listener = pifacedigitalio.InputEventListener(chip=pifacedigital)

    for i in range(4):

        listener.register(i, pifacedigitalio.IODIR_ON, switch_pressed)

        listener.register(i, pifacedigitalio.IODIR_OFF, switch_unpressed)

    listener.activate()

    while switch_pressed(1) ==1 :

        pfd.leds[1].turn_on()

    else:

        pfd.leds[1].turn_off()

while True:     #check program is still running by flashing led 3

    pfd.leds[2].toggle()     # toggle third LED

    sleep(DELAY)

Hi Andrew

I finally received the Pi2 and as you predicted the pifacecommon update resolved the problem.

I can now run blink1 and all is fine. I then tried to create a very basic script which set up the input interrupts as per the example and then switch an output on and off based on the status of an input. (When input 1 is pressed then turn on Output 1). This works fine using the GPIO, but not with piface. I have included the script below. I receive an Attribute error: 'int' object has no attribute 'chip'. I am well out of my depth here and no doubt I am making a very obvious error. Your help would be greatly appreciated.

from time import sleep

import pifacedigitalio

DELAY = 0.5  # seconds

pfd = pifacedigitalio.PiFaceDigital() # creates a PiFace Digtal object

def switch_pressed(event):

    event.chip.output_pins[event.pin_num].turn_on()

def switch_unpressed(event):

    event.chip.output_pins[event.pin_num].turn_off()

if __name__ == "__main__":

    pifacedigital = pifacedigitalio.PiFaceDigital()

    listener = pifacedigitalio.InputEventListener(chip=pifacedigital)

    for i in range(4):

        listener.register(i, pifacedigitalio.IODIR_ON, switch_pressed)

        listener.register(i, pifacedigitalio.IODIR_OFF, switch_unpressed)

    listener.activate()

    while switch_pressed(1) ==1 :

        pfd.leds[1].turn_on()

    else:

        pfd.leds[1].turn_off()

while True:     #check program is still running by flashing led 3

    pfd.leds[2].toggle()     # toggle third LED

    sleep(DELAY)