Raspberry pi 3 : sample python snap to read data gpio pins

snapcraft
2

EDIT

See RPi3 GPIO confinement from a SNAP called from another SNAP

This won’t work until snapd 2.31, and exposes the “gpio-memory-control” slot

Also your program will have to run as a daemon (which should not be a problem)

I’ve edited my OP to reflect these changes, minding any errors as this is untested.

I will also make a full example and edit this post again.

OP

Hello

The easiest way (imo) is to use the RPI.GPIO python package;

In your snapcraft.yaml, define a part such as:

parts:
  setup:
    plugin: python
    python-version: python3
    python-packages: [RPi.GPIO]

Now you can have an app which has the gpio gpio-memory-control plug:

apps:
  myprogram:
    command: bin/myprogram
    daemon: simple
    plugs: [gpio-memory-control]

Your “myprogram” script daemon could look like this:

#!/usr/bin/env python3

import RPi.GPIO as GPIO
import time

# Set up PIN 0 as output
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(0, GPIO.OUT)	

on = True

# Every second toggle output
while True:
    GPIO.output(0, on)
    on = not on
    time.sleep(1)

Do not forget to connect the slot/plug!