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Quellcode

class MDB(object):
  def __init__(self, deviceid):
    self.__deviceid = deviceid
    self.__scaling = 0
    self.__coins = {}
    self.__deposited = 0

  def _ftdisend(self, data, mode):
    data_parity = self._parityOf(int(hexlify(data), 16))

    if data_parity == -1:
      if mode:
        #parity = serial.PARITY_EVEN
        parity = 2
      else:
        #parity = serial.PARITY_ODD
        parity = 1
    else:
      if mode:
        #parity = serial.PARITY_ODD
        parity = 1
      else:
        #parity = serial.PARITY_EVEN
        parity = 2

    self.__device = Device(self.__deviceid)
    self.__device.ftdi_fn.ftdi_set_line_property(8, 1, parity)
    self.__device.baudrate = 9600
    self.__device.write(data)
    self.__device.flush()

  def _parityOf(self, int_type):
      parity = 0
      while (int_type):
          parity = ~parity
          int_type = int_type & (int_type - 1)
      return(parity)

  def _read(self):
    returndata = []
    for i in self.__device.read(100):
      returndata.append(i)

    return returndata

  def _send(self, data):
    mode = 1

    for element in data:
      self._ftdisend(element, mode)
      mode = 0

    self._ftdisend(self._calcchk(data), 0)

    time.sleep(0.1)
    return self._read()

  def _calcchk(self, data):
    sum = 0
    for byte in data:
        sum += int(hexlify(byte), 16)
    return unhexlify('{:02x}'.format(sum % 256))

  def _getbits(self, byte):
    return bin(int(hexlify(byte), 16))[2:].zfill(8)

Quellcode

  def reset(self):
    print "OUT: Reset"
    answer = self._send(data = ['\x08'])
    if (len(answer) == 1) and (answer[0] == '\x00'):
      print "IN : OK"
    else:
      print "IN: Fail - " + answer