Python crc7 Examples

Example #1

File: registerio_spi.py Project: Twinters007/robotpy-wpilib-utilities

 def read(self, first_address, count):
     
     data = [first_address, count]
     data.append(crc7(data))
     
     with self.mutex:
         retcount = self.port.write(data)
         if retcount != len(data):
             raise IOError("Write error (%s != %s)" % (retcount, len(data)))
         
         # FIXME
         if not hal.isSimulation():
             Timer.delay(0.001)
         
         data = self.port.read(True, count + 1)
         
     if len(data) != count + 1:
         raise IOError("Read error (%s != %s)" % (len(data), count+1))
     
     crc = data[-1]
     data = data[:-1]
     
     if crc7(data) != crc:
         raise IOError("CRC error")
     
     return data

Example #2

File: registerio_spi.py Project: robobenklein/pi-navx

    def write(self, address, value):
        data = [address | 0x80, value]
        data.append(crc7(data))
        if self.port.write(data) != len(data):
            return False

        return True

Example #3

File: registerio_spi.py Project: dsaini64/robotpy-wpilib-utilities

 def write(self, address, value):
     data = [address | 0x80, value]
     data.append(crc7(data))
     if self.port.write(data) != len(data):
         return False
     
     return True

Example #4

File: registerio_spi.py Project: robobenklein/pi-navx

    def read(self, first_address, count):

        data = [first_address, count]
        data.append(crc7(data))
        retcount = self.port.write(data)
        if retcount != len(data):
            raise IOError("Write error (%s != %s)" % (retcount, len(data)))

        Timer.delay(0.001)

        data = self.port.read(True, count + 1)
        if len(data) != count + 1:
            raise IOError("Read error (%s != %s)" % (len(data), count + 1))

        crc = data[-1]
        data = data[:-1]

        if crc7(data) != crc:
            raise IOError("CRC error")

        return data