class ArduinoController:
BAUD_RATE = 115200
def __init__(self):
self.parser = Parser()
self.arduino = Arduino(ArduinoController.BAUD_RATE)
self.arduino.register_listener(self)
self.msg_handlers = {
'log_format': self.parser.register_log_format,
'sensor_readings': self.notify_listeners
}
self.log_received_listeners = []
def register_listener(self, listener):
"""Register a listener to the log received event."""
# Make sure the listener has the on_log_received method defined.
m = getattr(listener, 'on_log_received', None)
if callable(m):
self.log_received_listeners.append(listener)
def on_msg_received(self, msg):
"""Attempt to parse & handle the received serial message."""
try:
parsed_msg = self.parser.parse_msg(msg)
handler = self.msg_handlers[parsed_msg['header']]
handler(parsed_msg['data'])
except KeyError:
raise BadSerialMessageError(
'Unknown command: {}'.format(parsed_msg['header']))
except BadSerialMessageError as e:
print 'Ignoring bad msg: {}'.format(e)
def start(self):
self.arduino.start() # For now simply delegate to the Arduino class.
def stop(self):
self.arduino.stop() # For now simply delegate to the Arduino class.
def notify_listeners(self, data):
"""Notify all listeners of the log received event."""
try:
readings = self.parser.parse_sensor_readings(data)
for listener in self.log_received_listeners:
listener.on_log_received(readings)
except BadSerialMessageError as e:
print "Ignoring bad log: {}".format(e)
