mirror of https://github.com/F5OEO/rpitx
Add Gaionim pyhthon dcf77 generator : works on setting my clock
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F5OEO
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25e5869d2e
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# encoding: utf-8
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"""
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From https://github.com/gaionim
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inspired by https://github.com/CodingGhost/DCF77-Transmitter
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reference
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https://en.wikipedia.org/wiki/DCF77
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"""
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import datetime
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import struct
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from subprocess import call
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from ctypes import *
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class Sample(Structure):
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_fields_ = [("amplitude", c_double), ("timing", c_uint)]
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#with open("/tmp/upstream.bin", "rb") as file:
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# result = []
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# x = Pippo()
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# while file.readinto(x) == sizeof(x):
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# result.append((x.a, x.t))
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BASE = [1, 2, 4, 8, 10, 20, 40, 80]
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NUMS = 5
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UP = 32767.0
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#DOWN = 3276.0
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DOWN = 0.0
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filename = "/tmp/pippo.rfa"
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# from https://git.s7t.de/dcf77/dcf77-python/blob/master/dcf77/dcfvalue.py
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class DCF77Value:
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def __init__(self):
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self.hour = 00
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self.minute = 00
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self.second = 00
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self.day = 00
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self.month = 00
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self.year = 0000
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self.data = []
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self.parity = True
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self.data = []
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self.chunklist = {
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"startbit" : [0, 1],
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"weather" : [1, 14],
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"callbit" : [15, 1],
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"cest_announce" : [16, 1],
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"cest" : [17, 1],
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"cet" : [18, 1],
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"leap_second_announce" : [19, 1],
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"start_time" : [20, 1],
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"minute" : [21, 7],
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"minute_parity" : [28, 1],
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"hour" : [29, 6],
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"hour_parity" : [35, 1],
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"day_month" : [36, 6],
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"day_week" : [42, 3],
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"month" : [45, 5],
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"year" : [50, 8],
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"date_parity" : [58, 1],
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"date" : [36, 22],
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"minute_mark" : [59, 1],
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}
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def getByte(self, byte):
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if len(self.data) >= byte:
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return self.data[byte]
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return False
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def getChunk(self, chunk):
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start = self.chunklist[chunk][0];
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end = start + self.chunklist[chunk][1];
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if len(self.data) >= end:
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return self.data[start:end]
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return False
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def getCurrentBitCount(self):
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return len(self.data)
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def setMinute(self):
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data = self.getChunk("minute")
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if data == False or len(data) < 7:
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return
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self.minute = (data[0] + (2 * data[1]) + (4 * data[2]) + (8 * data[3]) + (10 * data[4]) + (20 * data[5]) + (40 * data[6]))
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def setHour(self):
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data = self.getChunk("hour");
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print data
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if data == False or len(data) < 6:
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return
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self.hour = (data[0] + (2 * data[1]) + (4 * data[2]) + (8 * data[3]) + (10 * data[4]) + (20 * data[5]))
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def setDay(self):
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data = self.getChunk("day_month")
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if data == False or len(data) < 6:
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return
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self.day = (data[0] + (2 * data[1]) + (4 * data[2]) + (8 * data[3]) + (10 * data[4]) + (20 * data[5]))
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def setMonth(self):
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data = self.getChunk("month")
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if data == False or len(data) < 5:
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return
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self.month = (data[0] + (2 * data[1]) + (4 * data[2]) + (8 * data[3]) + (10 * data[4]))
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def setYear(self):
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data = self.getChunk("year")
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if data == False or len(data) < 8:
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return;
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self.year = (data[0] + (2 * data[1]) + (4 * data[2]) + (8 * data[3]) + (10 * data[4]) + (20 * data[5]) + (40 * data[6]) + (80 * data[7]) + 2000)
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def getMinute(self):
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return self.minute
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def getHour(self):
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return self.hour
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def getDay(self):
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return self.day
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def getMonth(self):
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return self.month
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def getYear(self):
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return self.year
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def getTime(self):
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return "%02d:%02d" % (self.getHour(), self.getMinute())
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def getDate(self):
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return "%02d.%02d.%04d" % (self.getDay(), self.getMonth(), self.getYear())
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def parse(self):
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self.setMinute()
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self.setHour()
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self.setDay()
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self.setMonth()
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self.setYear()
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# fine
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def int_to_bcd(value, num_bits):
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"""
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"""
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bits = []
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for base in reversed(BASE[:num_bits]):
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if value >= base:
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bits.append("1")
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value -= base
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else:
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bits.append("0")
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return "".join(reversed(bits))
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def add_crc(value, odd=True):
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num = value.count("1")
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p = num % 2
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if(( p == 1 ) and odd) or ( p==0 and not odd) :
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return "%s1" % value
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else:
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return "%s0" % value
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def to_dcf77(data):
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time_code = ["011111111100000",]
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time_code.append("11")
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if data.dst():
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time_code.append("10")
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else:
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time_code.append("01")
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time_code.append("0") #leap second
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time_code.append("1")
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time_code.append(add_crc(int_to_bcd(data.minute, 7)))
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time_code.append(add_crc(int_to_bcd(data.hour, 6)))
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date = [int_to_bcd(data.day, 6),]
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date.append(int_to_bcd(data.weekday()+1, 3))
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date.append(int_to_bcd(data.month, 5))
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date.append(int_to_bcd(data.year - 2000, 8))
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time_code.append(add_crc("".join(date)))
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return "".join(time_code)
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def modulate(value=None):
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if value is None:
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# last secons
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return [(UP,1000000000)]
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else:
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if value == 0:
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return [(DOWN,100000000),
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(UP,900000000)]
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else:
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return [(DOWN,200000000),
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(UP,800000000)]
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if __name__ == "__main__":
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with open(filename, "wb") as f:
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now = datetime.datetime.now()
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# tolgo secondi per arrivare a inizio minuto
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# aggiungo 1 per arrivare a prossimo minuto
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# aggiungo 1 perchè ad ogni minuto, comunico il minuto dopo
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start = now + datetime.timedelta(minutes=2) - \
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datetime.timedelta(microseconds = now.microsecond,
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seconds = now.second )
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if now.second >= 58:
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# not enougth time
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start = start + datetime.timedelta(minutes=1)
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sample = Sample()
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for i in range(NUMS):
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for val in ( int(v) for v in to_dcf77(start + datetime.timedelta(i))):
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print val, ":",
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for amplitude, timing in modulate(val):
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sample.amplitude = amplitude
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sample.timing = timing
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#f.write(struct.pack("!fI", amplitude, timing))
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f.write(sample)
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print "%s, %s" % (amplitude, timing)
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# inizio minuto
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print "chiusura :",
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for amplitude, timing in modulate():
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sample.amplitude = amplitude
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sample.timing = timing
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#f.write(struct.pack("!fI", amplitude, timing))
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f.write(sample)
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print "%s, %s" % (amplitude, timing)
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trigger = start - datetime.timedelta(minutes=1)
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call(["sudo", "./rpitx", "-m", "RFA", "-i", filename, "-f", "77.500", "-l","-c","1"])
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