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1)
 def __pwmRead__(self, channel):
        addr = self.getChannelAddress(channel)
        d = self.readRegisters(addr, 4)
        start = d[1] << 8 | d[0]
        end   = d[3] << 8 | d[2]
        return end-start
    
2)
    def __pwmWrite__(self, channel, value):
        addr = self.getChannelAddress(channel)
        d = bytearray(4)
        d[0] = 0
        d[1] = 0
        d[2] = (value & 0x0FF)
        d[3] = (value & 0xF00) >> 8
        self.writeRegisters(addr, d)