button.py

# Copyright @ 20023, Adrian Blakey. All rights reserved
# Represents a button on the device

from machine import Pin
import logging

log = logging.getLogger("button")

class Button(object):
    
    rest_state = False
    # pin = None
    # pin_number = 0
    RELEASED = 'released'
    PRESSED = 'pressed'
    def __init__(self, pin, rest_state = False, callback = None, internal_pullup = False, internal_pulldown = False):
        self.pin_number = pin
        self.rest_state = rest_state
        if internal_pulldown:
            self.internal_pull = Pin.PULL_DOWN
            self.rest_state = False
        elif internal_pullup:
            self.internal_pull = Pin.PULL_UP
            self.rest_state = True
        else:
            self.internal_pull = None
        
        self.pin = Pin(pin, mode = Pin.IN, pull = self.internal_pull)
        
        self.callback = callback
        self.active = False
    
    def update(self):
        #log.debug('Pin value %s', self.pin.value())
        if self.pin.value() == (not self.rest_state) and (not self.active):
            self.active = True
            if self.callback != None:
                self.callback(self.pin_number, Button.PRESSED)
            return
        if self.pin.value() == self.rest_state and self.active:
            self.active = False
            if self.callback != None:
                self.callback(self.pin_number, Button.RELEASED)
            return