* flag cannot be used with the I2C_STOP flag.
* @param addr The slave device address. Only used if I2C_START is set.
* @param length Length, in bytes, to be read
* flag cannot be used with the I2C_STOP flag.
* @param addr The slave device address. Only used if I2C_START is set.
* @param length Length, in bytes, to be read