code: def write_block_data(self, i2c_addr, register, data, force=None):
          
          length = len(data)
          if length > I2C_SMBUS_BLOCK_MAX:
              raise ValueError("Data length cannot exceed %d bytes" % I2C_SMBUS_BLOCK_MAX)
          self._set_address(i2c_addr, force=force)
          msg = i2c_smbus_ioctl_data.create(
              read_write=I2C_SMBUS_WRITE, command=register, size=I2C_SMBUS_BLOCK_DATA
          )
          msg.data.contents.block[0] = length
          msg.data.contents.block[1:length + 1] = data
          ioctl(self.fd, I2C_SMBUS, msg)
docs: Write a block of byte data to a given register.
  
          :param i2c_addr: i2c address
          :type i2c_addr: int
          :param register: Start register
          :type register: int
          :param data: List of bytes
          :type data: list
          :param force:
          :type force: Boolean
          :rtype: None