class MonitorOption(object):
STATUS = enum("INIT", "SAMPLING")
def __init__(self, quantity, **kwargs):
if quantity <= 0:
raise ValueError("'quantity' must be a positive integer")
self.quantity = quantity
self.fake_samples = kwargs["fake_samples"]
self.debug = kwargs["debug"]
self.output = kwargs["output_fd"]
self.config = Config(kwargs["calibration_filename"], False)
self.status = self.STATUS.INIT
def init(self):
"""
Do a handshake:
1. Open a serial connection with Arduino.
2. Send a STOP REQUEST.
3. Wait for an OK RESPONSE.
"""
self.arduino = Arduino(RESPONSE_SIZE, debug=self.debug)
self.arduino.start()
self.arduino.send_message(enc_stop_request())
message = self.arduino.read_message()
opcode, data = dec_message(message)
if opcode != RESPONSE.OK:
raise IOError("Expecting OK, got %s"
% RESPONSE.reverse[opcode])
def run(self):
"""Run the function with same name as current status."""
getattr(self, "status_"
+ self.STATUS.reverse[self.status].lower())()
def sigint_handler(self):
self.arduino.send_message(enc_stop_request())
self.arduino.close()
def send_monitor_request(self, mode):
self.arduino.send_message(enc_monitor_request(mode,
self.fake_samples, self.quantity,
self.config.calibration("phase"),
self.config.calibration("voltage_offset"),
self.config.calibration("current_offset")))
def print_data(self, data):
data = self.unpack_data(data)
out = ' '.join("%f" % d for d in data) + '\n'
# sys.stderr.write('MONITOR: ' + out)
self.output.write(out)
self.output.flush()
def __init__(self, quantity, **kwargs):
if quantity <= 0:
raise ValueError("'quantity' must be a positive integer")
self.quantity = quantity
self.fake_samples = kwargs["fake_samples"]
self.debug = kwargs["debug"]
self.output = kwargs["output_fd"]
self.config = Config(kwargs["calibration_filename"], False)
self.status = self.STATUS.INIT
