CORE_I2C_SMBUS_MSG_RD
msgs[CORE_I2C_SMBUS_MSG_RD].addr = addr;
msgs[CORE_I2C_SMBUS_MSG_RD].flags = I2C_M_RD;
msgs[CORE_I2C_SMBUS_MSG_RD].len = size - 1;
msgs[CORE_I2C_SMBUS_MSG_RD].buf = &data->byte;
msgs[CORE_I2C_SMBUS_MSG_RD].len = size - 1;
msgs[CORE_I2C_SMBUS_MSG_RD].buf = rx_buf;
msgs[CORE_I2C_SMBUS_MSG_RD].len = I2C_SMBUS_BLOCK_MAX + 1;
msgs[CORE_I2C_SMBUS_MSG_RD].buf = rx_buf;