config.py

from numpy import array
"""
Configuration file
"""

# Default pairing pin code 
PINCODE = "1234"
DISCOVERABLE_TIMEOUT = 20

""" GPIO pin configurations """

# Ringer frequency in hertz
RINGER_FREQUENCY = 25
# Ringer pattern in seconds
RINGER_PATTERN = array([0.4, 0.2, 0.4, 2])   # time on,off,on,off
# ringer gpio pin on RPi3B+
RINGER_PIN = 12
# Ringer on pin - adds/removes power from bell.
RINGER_ENABLE_PIN = 18
# Receiver / handset GPIO pin on RPi3B+
HOERER_PIN = 13

# Dialer GPIO pin on RPi3B+
NS_PIN = 19

# GPIO pin for making RPi discoverable on RPi3B+
DISCOVERABLE_PIN = 20


""" Dictionary of GPIO pins on RPi3B+ for volume control functions. If no volume controls then set to None.
    Peculiar to 1950 model phone used in this project. It has 5 external buttons for PABX functions that have been 
    used for other functions 
"""
VOLUME_PIN_DICT = {'VOLUME_UP_PIN': 23,
                   'VOLUME_DOWN_PIN': 24,
                   'VOLUME_MUTE_PIN': 25
                   }

""" Phone hardware constants """
# Switch bounce times for edge detection (units: ms)
DIAL_BOUNCE_TIME = 90
BUTTON_BOUNCE_TIME = 200
RECEIVER_BOUNCE_TIME = 100
VOLUME_INCREMENT = 5


""" Misc constants """
# misc. constants
READY = "READY"  # Flag indicating that modem has changed state t being ready for calls.
ALREADY_ON = "ALREADYON"  # Flag indicating that there was a phone connected at startup
RING_START ="RINGSTART"  # Ring the bell
RING_STOP = "RINGSTOP"  # Signal to stop the bell ringing