/**
   * @brief  Initialization function
   * @return Whether the device is on or not. return true succeed ;return false failed.
   */
  bool begin();

  /**
   * @brief  Configure the default level of the INT pin and enable the GPIO1 interrupt function
   * @param  mode  Enable interrupt mode
   * @n            VL6180X_DIS_INTERRUPT  disabled interrupt
   * @n            VL6180X_DIS_INTERRUPT  GPIO1 interrupt enabled, INT high by default
   * @n            VL6180X_LOW_INTERRUPT  GPIO1 interrupt enabled, INT low by default
   */
  void setInterrupt(uint8_t mode);

  /**
   * @brief  A single range
   * @return   return ranging data ,uint mm
   */
  uint8_t rangePollMeasurement();

  /**
   * @brief  Configuration ranging period
   * @param  period_ms  Measurement period, in milliseconds
   */
  void rangeSetInterMeasurementPeriod(uint16_t periodMs);

  /**
   * @brief  Configure the interrupt mode for ranging
   * @param  mode  Enable interrupt mode
   * @n              VL6180X_INT_DISABLE                           interrupt disable                   
   * @n              VL6180X_LEVEL_LOW                             value < thresh_low                      
   * @n              VL6180X_LEVEL_HIGH                            value > thresh_high                      
   * @n              VL6180X_OUT_OF_WINDOW                         value < thresh_low OR value > thresh_high
   * @n              VL6180X_NEW_SAMPLE_READY                      new sample ready                      
   */
  bool rangeConfigInterrupt(uint8_t mode);

  /**
   * @brief  Configure the interrupt mode for the ambient light
   * @param  mode  Enable interrupt mode
   * @n              VL6180X_INT_DISABLE                           interrupt disable                   
   * @n              VL6180X_LEVEL_LOW                             value < thresh_low                      
   * @n              VL6180X_LEVEL_HIGH                            value > thresh_high                      
   * @n              VL6180X_OUT_OF_WINDOW                         value < thresh_low OR value > thresh_high
   * @n              VL6180X_NEW_SAMPLE_READY                      new sample ready                      
   */
  bool alsConfigInterrupt(uint8_t mode);

  /**
   * @brief Enable continuous ranging mode
   */
  void rangeStartContinuousMode();

  /**
   * @brief  Retrieve ranging data
   * @return   return ranging data ,uint mm
   */
  uint8_t rangeGetMeasurement();

  /**
   * @brief  Clear the ambient light interrupt
   */
  void clearAlsInterrupt();

  /**
   * @brief  Clear ranging interrupt
   */
  void clearRangeInterrupt();

  /**
   * @brief Single measurement of ambient light
   * @return   return The light intensity,uint lux
   */
  float alsPoLLMeasurement();

  /**
   * @brief  Obtain measured light data
   * @return   return The light intensity,uint lux
   */
  float alsGetMeasurement();

  /**
   * @brief  Enable continuous measurement of ambient light intensity mode
   */
  void alsStartContinuousMode();

  /**
   * @brief  Configure the period for measuring light intensity
   * @param  period_ms  Measurement period, in milliseconds
   */
  void alsSetInterMeasurementPeriod(uint16_t periodMs);

  /**
   * @brief  turn on interleaved mode
   */
  void startInterleavedMode();

  /**
   * @brief  Get the interrupt state of the ranging
   * @return   return status
   * @n             0                        ： No threshold events reported
   * @n             VL6180X_LEVEL_LOW        ：value < thresh_low
   * @n             VL6180X_LEVEL_HIGH       ：value > thresh_high
   * @n             VL6180X_OUT_OF_WINDOW    ：value < thresh_low OR value > thresh_high
   * @n             VL6180X_NEW_SAMPLE_READY ：new sample ready
   */
  uint8_t rangeGetInterruptStatus();

  /**
   * @brief  Get the interrupt state of the measured light intensity
   * @return   return status
   * @n             0                        ： No threshold events reported
   * @n             VL6180X_LEVEL_LOW        ：value < thresh_low
   * @n             VL6180X_LEVEL_HIGH       ：value > thresh_high
   * @n             VL6180X_OUT_OF_WINDOW    ：value < thresh_low OR value > thresh_high
   * @n             VL6180X_NEW_SAMPLE_READY ：new sample ready
   */
  uint8_t alsGetInterruptStatus();

  /**
   * @brief  Get validation information for range data
   * @return Authentication information
   */
  uint8_t getRangeResult();

  /**
   * @brief  set IIC addr
   * @param  addr  The IIC address to be modified
   */
  void setIICAddr(uint8_t addr);

  /**
   * @brief  Set the ALS gain 
   * @param  gain  the value of gain(range 0-7)
   * @n            20   times gain: VL6180X_ALS_GAIN_20       = 0
   * @n            10   times gain: VL6180X_ALS_GAIN_10       = 1
   * @n            5    times gain: VL6180X_ALS_GAIN_5        = 2
   * @n            2.5  times gain: VL6180X_ALS_GAIN_2_5      = 3
   * @n            1.57 times gain: VL6180X_ALS_GAIN_1_67     = 4
   * @n            1.27 times gain: VL6180X_ALS_GAIN_1_25     = 5
   * @n            1    times gain: VL6180X_ALS_GAIN_1        = 6
   * @n            40   times gain: VL6180X_ALS_GAIN_40       = 7
   * @return true :Set up the success, false :Setup failed
   */
  bool setALSGain(uint8_t gain = VL6180X_ALS_GAIN_1);

  /**
   * @brief  Set ALS Threshold Value
   * @param  thresholdL :Lower Threshold
   * @param  thresholdH :Upper threshold
   */
  void setALSThresholdValue(uint16_t thresholdL=0x0000,uint16_t thresholdH=0xFFFF);

  /**
   * @brief  Set Range Threshold Value
   * @param  thresholdL :Lower Threshold
   * @param  thresholdH :Upper threshold
   */
  void setRangeThresholdValue(uint8_t thresholdL=0x00,uint8_t thresholdH=0xFF);