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# Source code for SetWeatherStation

    #!/usr/bin/env python

    """Set some weather station parameters
    ::

    %s

    """

    __docformat__ = "restructuredtext en"
    __usage__ = """
     usage: python SetWeatherStation.py [options]
     options are:
      -h   | --help           display this help
      -c   | --clock          set weather station clock to computer time
                              (unlikely to work)
      -p f | --pressure f     set relative pressure to f hPa
      -r n | --read_period n  set logging interval to n minutes
      -v   | --verbose        increase error message verbosity
      -z   | --zero_memory    clear the weather station logged reading count
    """
    __doc__ %= __usage__
    __usage__ = __doc__.split('\n')[0] + __usage__

    from datetime import datetime, timedelta
    import getopt
    import logging
    import sys
    import time

    from pywws.Logger import ApplicationLogger
    from pywws import WeatherStation

    def bcd_encode(value):
        hi = value // 10
        lo = value % 10
        return (hi * 16) + lo
    def main(argv=None):
        if argv is None:
            argv = sys.argv
        try:
            opts, args = getopt.getopt(
                argv[1:], "hcp:r:vz",
                ['help', 'clock', 'pressure=', 'read_period=',
                 'verbose', 'zero_memory'])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, __usage__.strip()
            return 1
        # process options
        clock = False
        pressure = None
        read_period = None
        verbose = 0
        zero_memory = False
        for o, a in opts:
            if o in ('-h', '--help'):
                print __usage__.strip()
                return 0
            elif o in ('-c', '--clock'):
                clock = True
            elif o in ('-p', '--pressure'):
                pressure = int((float(a) * 10.0) + 0.5)
            elif o in ('-r', '--read_period'):
                read_period = int(a)
            elif o in ('-v', '--verbose'):
                verbose += 1
            elif o in ('-z', '--zero_memory'):
                zero_memory = True
        # check arguments
        if len(args) != 0:
            print >>sys.stderr, "Error: No arguments required"
            print >>sys.stderr, __usage__.strip()
            return 2
        logger = ApplicationLogger(verbose)
        # open connection to weather station
        ws = WeatherStation.weather_station()
        # set data to be sent to station
        data = []
        # set relative pressure
        if pressure:
            ptr = ws.fixed_format['rel_pressure'][0]
            data.append((ptr,   pressure % 256))
            data.append((ptr+1, pressure // 256))
        # set read period
        if read_period:
            data.append((ws.fixed_format['read_period'][0], read_period))
        # reset data count
        if zero_memory:
            ptr = ws.fixed_format['data_count'][0]
            data.append((ptr,   1))
            data.append((ptr+1, 0))
        # set clock
        if clock:
            print "Clock setting is not known to work on any model of weather station."
            print "If it works for you, please let Jim Easterbrook know."
            print "waiting for exact minute"
            now = datetime.now()
            if now.second >= 55:
                time.sleep(10)
                now = datetime.now()
            now += timedelta(minutes=1)
            ptr = ws.fixed_format['date_time'][0]
            data.append((ptr,   bcd_encode(now.year - 2000)))
            data.append((ptr+1, bcd_encode(now.month)))
            data.append((ptr+2, bcd_encode(now.day)))
            data.append((ptr+3, bcd_encode(now.hour)))
            data.append((ptr+4, bcd_encode(now.minute)))
            time.sleep(59 - now.second)
        # send it all in one go
        if data:
            ws.write_data(data)
    if __name__ == "__main__":
        sys.exit(main())

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