iic_smbus_write_byte
error = iic_smbus_write_byte(tag, sc->sc_addr, reg, value, flags);
return iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, reg, val, 0);
(void)iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, reg, val, 0);
int iic_smbus_write_byte(i2c_tag_t, i2c_addr_t, uint8_t, uint8_t, int);