299 lines
9.1 KiB
Python
299 lines
9.1 KiB
Python
import logging
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import functools
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from time import sleep
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from enum import Enum
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from typing import Any, List
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from scipy.io.wavfile import write as writewav
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import sounddevice as sd
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import soundfile as sf
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from . import gpio_pins
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from picamera import PiCamera
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from gpiozero import Button
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import serial
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logger = logging.getLogger(__name__)
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# Constants
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VIDEO_RES = (1920, 1080) # Video Resolution
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PHOTO_RES = (2592, 1944) # Photo Resolution
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AUDIO_REC_SR = 44100 # Audio Recording Samplerate
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SERIAL_DEV = '/dev/serial0' # Serial port to use
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SERIAL_BAUDRATE = 115200 # Serial connection baud rate
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SERIAL_CONN_TIMEOUT = 60 # Serial connection read timeout
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class SerialCommands(Enum):
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HELLO = b'\x00'
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ALREADY_CONNECTED = b'\x01'
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ERROR = b'\x02'
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RECEIVED = b'\x03'
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MOTOR_H = b'H'
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MOTOR_V = b'V'
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BACKLIGHT = b'B'
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FRONTLIGHT = b'F'
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USER_INTERACT = b'U'
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RESP_BLUE = b'X'
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RESP_RED = b'O'
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RESP_YELLOW = b'Y'
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RESP_GREEN = b'N'
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RECORD = b'C'
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REWIND = b'R'
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DEBUG_SCROLL = b'S'
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DEBUG_SENSORS = b'Z'
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EOT = b'\n'
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class SerialCommunicationError(Exception):
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pass
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class PizzaHAL:
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"""
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This class holds a represenation of the pizza box hardware and provides
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methods to interact with it.
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- lights upper/lower on/off
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- motor up-down/left-right speed distance
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- scroll up-down/left-right positions
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- lid open/closed detectors
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- user interface buttons
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"""
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def __init__(self, serialdev: str = SERIAL_DEV, baudrate: int = SERIAL_BAUDRATE, timeout: float = SERIAL_CONN_TIMEOUT):
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self.serialcon = serial.Serial(serialdev, baudrate=baudrate, timeout=timeout)
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self.btn_start = Button(gpio_pins.BTN_START)
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self.camera = None
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self.soundcache = {}
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self.connected = False
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def init_connection(self):
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self.serialcon.write(SerialCommands.HELLO.value + SerialCommands.EOT.value)
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resp = self.serialcon.read_until()
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if resp == (SerialCommands.HELLO.value + SerialCommands.EOT.value):
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self.serialcon.write(SerialCommands.ALREADY_CONNECTED.value + SerialCommands.EOT.value)
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resp = self.serialcon.read_until()
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if resp == (SerialCommands.ALREADY_CONNECTED.value + SerialCommands.EOT.value):
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logger.info('Serial Connection established')
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elif resp == b'':
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raise SerialCommunicationError('Timeout on initializing connection.')
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else:
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raise SerialCommunicationError(f'Serial Connection received invalid response to ALREADY CONNECTED: {resp}')
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elif resp == (SerialCommands.ALREADY_CONNECTED.value + SerialCommands.EOT.value):
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logger.warn('Serial Connection received ALREADY CONNECTED as response to HELLO. Assuming connection ok.')
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elif resp == b'':
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raise SerialCommunicationError('Timeout on initializing connection.')
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else:
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raise SerialCommunicationError(f'Serial Connection received invalid response to HELLO: {resp}')
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self.connected = True
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def send_cmd(self, command: SerialCommands, *options):
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"""
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Send a command and optional options. Options need to be encoded as bytes before passing.
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"""
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if not self.connected:
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raise SerialCommunicationError("Serial Communication not initialized. Call `init_connection()` before `send_cmd()`.")
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self.serialcon.write(command.value)
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for o in options:
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self.serialcon.write(o)
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self.serialcon.write(SerialCommands.EOT.value)
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resp = self.serialcon.read_until()
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# TODO handle errors in response
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return resp
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def move_vert(hal: PizzaHAL, steps: int):
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"""
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Move the motor controlling the vertical scroll a given distance.
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"""
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hal.send_cmd(SerialCommands.MOTOR_V, steps.to_bytes(2, 'little', signed=True))
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def move_hor(hal: PizzaHAL, steps: int):
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"""
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Move the motor controlling the horizontal scroll a given distance.
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"""
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hal.send_cmd(SerialCommands.MOTOR_H, steps.to_bytes(2, 'little', signed=True))
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def rewind(hal: PizzaHAL):
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"""
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Rewind both scrolls.
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"""
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hal.send_cmd(SerialCommands.REWIND)
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def turn_off(hal: PizzaHAL):
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"""
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Turn off everything.
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"""
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hal.send_cmd(SerialCommands.BACKLIGHT, 0)
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hal.send_cmd(SerialCommands.FRONTLIGHT, 0)
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def wait_for_input(hal: PizzaHAL, go_callback: Any,
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back_callback: Any, to_callback: Any,
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timeout=120, **kwargs):
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"""
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Blink leds on buttons. Wait until the user presses a button, then execute
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the appropriate callback
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:param hal: The hardware abstraction object
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:param go_callback: called when button 'go' is pressed
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:param back_callback: called whan button 'back' is pressed
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:param to_callback: called on timeout
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:param timeout: inactivity timeout in seconds (default 120)
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"""
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resp = hal.send_cmd(SerialCommands.USER_INTERACTION, timeout).strip()
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if resp == b'B':
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go_callback(**kwargs)
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elif resp == b'R':
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back_callback(**kwargs)
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else:
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to_callback(**kwargs)
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def light_layer(hal: PizzaHAL, r: float, g: float, b: float, w: float, fade: float = 0.0, **kwargs):
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"""
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Turn on the light to illuminate the upper scroll
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:param hal: The hardware abstraction object
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:param fade: float
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Default 0, time in seconds to fade in or out
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:param intensity: float
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Intensity of the light in percent
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:param steps: int
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How many steps for the fade (default: 100)
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"""
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hal.send_cmd(SerialCommands.FRONTLIGHT,
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int(r * 255).to_bytes(1, 'little'),
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int(g * 255).to_bytes(1, 'little'),
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int(b * 255).to_bytes(1, 'little'),
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int(w * 255).to_bytes(1, 'little'),
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int(fade * 1000).to_bytes(4, 'little'))
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def backlight(hal: PizzaHAL, r: float, g: float, b: float, w: float, fade: float = 0.0, **kwargs):
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"""
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Turn on the backlight
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:param hal: The hardware abstraction object
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:param fade: float
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Default 0, time in seconds to fade in or out
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:param intensity: float
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Intensity of the light in percent
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:param steps: int
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How many steps for the fade (default: 100)
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"""
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hal.send_cmd(SerialCommands.BACKLIGHT,
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int(r * 255).to_bytes(1, 'little'),
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int(g * 255).to_bytes(1, 'little'),
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int(b * 255).to_bytes(1, 'little'),
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int(w * 255).to_bytes(1, 'little'),
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int(fade * 1000).to_bytes(4, 'little'))
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def play_sound(hal: PizzaHAL, sound: Any, **kwargs):
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"""
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Play a sound.
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:param hal: The hardware abstraction object
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:param sound: The sound to be played
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"""
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# Extract data and sampling rate from file
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try:
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data, fs = hal.soundcache.get(str(sound), sf.read(str(sound), dtype='float32'))
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sd.play(data, fs)
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sd.wait() # Wait until file is done playing
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except KeyboardInterrupt:
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logger.debug('skipped playback')
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# sd.stop()
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def record_sound(hal: PizzaHAL, filename: Any, duration: float,
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cache: bool = False, **kwargs):
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"""
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Record sound using the microphone
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:param hal: The hardware abstraction object
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:param filename: The path of the file to record to
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:param duration: The time to record in seconds
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:param cache: `True` to save recording to cache. Default is `False`
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"""
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myrecording = sd.rec(int(duration * AUDIO_REC_SR),
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samplerate=AUDIO_REC_SR,
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channels=2)
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resp = hal.send_cmd(SerialCommands.RECORD, int(duration)).strip()
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if resp == b'I':
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sd.stop()
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else:
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sd.wait() # Wait until recording is finished
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writewav(str(filename), AUDIO_REC_SR, myrecording)
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if cache:
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hal.soundcache[str(filename)] = (myrecording, AUDIO_REC_SR)
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def record_video(hal: PizzaHAL, filename: Any, duration: float, **kwargs):
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"""
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Record video using the camera
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:param hal: The hardware abstraction object
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:param filename: The path of the file to record to
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:param duration: The time to record in seconds
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"""
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hal.camera.resolution = VIDEO_RES
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hal.camera.start_recording(str(filename))
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hal.camera.wait_recording(duration)
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hal.camera.stop_recording()
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def take_photo(hal: PizzaHAL, filename: Any, **kwargs):
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"""
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Take a foto with the camera
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:param hal: The hardware abstraction object
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:param filename: The path of the filename for the foto
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"""
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hal.camera.resolution = PHOTO_RES
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hal.camera.capture(str(filename))
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def init_sounds(hal: PizzaHAL, sounds: List):
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"""
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Load prerecorded Sounds into memory
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:param hal:
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:param sounds: A list of sound files
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"""
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if hal.soundcache is None:
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hal.soundcache = {}
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for sound in sounds:
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# Extract data and sampling rate from file
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data, fs = sf.read(str(sound), dtype='float32')
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hal.soundcache[str(sound)] = (data, fs)
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def init_camera(hal: PizzaHAL):
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if hal.camera is None:
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hal.camera = PiCamera(sensor_mode=5)
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