smbus.py 文件源码

def read_block_data(self, addr, cmd):
        """Perform a block read from the specified cmd register of the device.
        The amount of data read is determined by the first byte send back by
        the device.  Data is returned as a bytearray.
        """
        # TODO: Unfortunately this will require calling the low level I2C
        # access ioctl to trigger a proper read_block_data.  The amount of data
        # returned isn't known until the device starts responding so an I2C_RDWR
        # ioctl won't work.
        raise NotImplementedError()