EPC decoding module.
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Mikaël Ates
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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'''
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Copyright (C) 2016 Entr'ouvert
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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'''
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import sys
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import re
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class InvalidEPC(Exception):
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def __init__(self, value):
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self.value = value
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def __str__(self):
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return repr(self.value)
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def word_flag(word):
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'''
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Test first bit of a 2 bytes words.
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'''
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return word & 32768
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class VeadistaEPC:
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def __init__(self, epc,
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trcal=85e-6, # V
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can_precision=13e-3, # V
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sensor_sensibility=70e-3, # V/°C
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sensor_center=34): # °C at 011111(b) = 31(d)
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if len(epc) != 24 or not re.match(r'[0-9a-fA-F]{24}', epc):
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raise InvalidEPC(epc)
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self.epc = epc
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self.words = [int(self.epc[i*4: i*4+4], 16) for i in range(6)]
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self.trcal = trcal
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self.can_precision = can_precision
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self.sensor_sensibility = sensor_sensibility
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self.sensor_center = sensor_center
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self.can_step = can_precision / sensor_sensibility
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self.sensor_start = sensor_center - 31 * self.can_step
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(self.temperature_int,
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self.temperature_degree,
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self.temperature_volt) = self.get_temperature()
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(self.tension_int,
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self.tension_volt) = self.get_tension()
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(self.cpt_trcal,
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self.period_osc,
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((self.hr1_int,
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self.hr1_second,
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self.hr1_bpm),
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(self.hr2_int,
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self.hr2_second,
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self.hr2_bpm),
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(self.hr3_int,
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self.hr3_second,
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self.hr3_bpm))) = self.get_hr()
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def t_celsius(self, value):
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return self.sensor_start + value * self.can_step
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def t_voltage(self, value):
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return value * self.can_precision
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def get_temperature(self):
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w = self.words[1]
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value = w & 63 # 6 lsb
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if word_flag(w):
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return value, self.t_celsius(value), self.t_voltage(value)
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return None, None, None
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def get_tension(self):
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w = self.words[2]
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value = w & 63 # 6 lsb
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if word_flag(w):
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return value, self.t_voltage(value)
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return None, None
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def get_hr(self):
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w = self.words[3]
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raw_trcal_count = w & 32512
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if raw_trcal_count:
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cpt_trcal = raw_trcal_count >> 8
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period_osc = self.trcal / (4 * (cpt_trcal + 1))
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def process_hr(w):
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if word_flag(w):
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count = w & 255
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if count > 2:
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period = (count + 1) * 4 * 4096 * period_osc
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return count, period, 60 / period
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return None, None, None
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return (cpt_trcal,
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period_osc,
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[process_hr(self.words[3+i]) for i in range(3)])
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return None, None, None
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def __str__(self):
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string = "----------------------------------------------------------------------"
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string += "\nEPC:\t{}\n".format(' '.join([self.epc[i*4:i*4+4] for i in range(6)]))
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w = self.words[1]
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string += "\nWord 3:\t\t\thex : {}\tint : {}\tbin : {:b}\n".format(self.epc[4:8], w, w)
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value = w & 63
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if word_flag(w):
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string += "CAN precision :\t\t{}V\n".format(self.can_precision)
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string += "Sensor sensibility :\t{}V/°C\n".format(self.sensor_sensibility)
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string += "Sensor centered at :\t{}°C\n".format(self.sensor_center)
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string += "Sensor range :"
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string += "\t\t{}°C to {}°C\n".format(self.sensor_start,
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self.sensor_start + 63 * self.can_step)
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string += "Temperature :\t\tint : {0}/63\tbin : {0:b}\n".format(self.temperature_int)
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string += "Temperature :\t\t{} V\n".format(self.temperature_volt)
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string += "Temperature :\t\t{} °C\n".format(self.temperature_degree)
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else:
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string += "Temperature :\t\tflag is null.\n"
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w = self.words[2]
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string += "\nWord 4:\t\t\thex : {}\tint : {}\tbin : {:b}\n".format(self.epc[8:12], w, w)
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value = w & 63
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if word_flag(w):
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string += "CAN precision :\t\t{}mV\n".format(self.can_precision)
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string += "External voltage :\tint : {0}/63\tbin : {0:b}\n".format(self.tension_int)
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string += "External voltage :\t{} V\n".format(self.tension_volt)
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else:
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string += "External voltage :\tflag is null.\n"
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w = self.words[3]
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string += "\nWord 5:\t\t\thex : {}\tint : {}\tbin : {:b}\n".format(self.epc[12:16], w, w)
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raw_trcal_count = w & 32512
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if not raw_trcal_count:
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string += "No TRCAL count\n"
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else:
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count = raw_trcal_count >> 8
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string += "TRCAL reader set : \t{}s\n".format(self.trcal)
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string += "TRCAL count : \t\tint : {0}/127\tbin : {0:b}\n".format(self.cpt_trcal)
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string += "Osc period (s) : \t{}\n".format(self.period_osc)
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string += "Osc frequency (Hz) : \t{}\n".format(1/self.period_osc)
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def process_hr(number, word, value, second, bpm):
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string = ""
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if word_flag(word):
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if not value:
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string += "Interval {} :\t\tno value\n".format(number)
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elif value <= 2:
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string += "Interval {} :\t\tthe sensor".format(number)
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string += "seems to be pressed continuously."
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string += "\traw int: {0}/255\traw bin : {0:b}\n".format(value)
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else:
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string += "Interval {0} :\t\tint: {1}/255".format(number, value)
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string += "\traw bin : {:b}\n".format(value)
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string += "Interval {} :\t\t{} s\n".format(number, second)
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string += "Interval {} :\t\t{} bpm\n".format(number, bpm)
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else:
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string += "Interval {} :\t\tflag is null.\n".format(number)
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return string
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string += process_hr(1, w, self.hr1_int, self.hr1_second, self.hr1_bpm)
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w = self.words[4]
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string += "\nWord 6:\t\t\thex : {}".format(self.epc[16:20])
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string += "\tint : {0}\tbin : {0:b}\n".format(w)
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string += process_hr(2, w, self.hr2_int, self.hr2_second, self.hr2_bpm)
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w = self.words[5]
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string += "\nWord 7:\t\t\thex : {}".format(self.epc[20:24])
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string += "\tint : {0}\tbin : {0:b}\n".format(w)
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string += process_hr(3, w, self.hr3_int, self.hr3_second, self.hr3_bpm)
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string += "----------------------------------------------------------------------\n"
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return string
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if __name__ == "__main__":
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epc = "FFFF800D8009A17C807C0000"
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if len(sys.argv) > 1:
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epc = sys.argv[1]
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epc = VeadistaEPC(epc)
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print(epc)
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