i2c_xfer
res = i2c_xfer(bus, I2C_ADDR_DEMOD, ®, 1, data, 1);
res = i2c_xfer(device->i2c_bus, I2C_ADDR_EEPROM, &adr, 1, d, sizeof(d));
status_t i2c_xfer(i2c_bus *bus, int address,