text: //*****************************************************************************
  //
  // isl29023.h - Prototypes for the ISL29023 light sensor driver.
  //
  // Copyright (c) 2013-2020 Texas Instruments Incorporated.  All rights reserved.
  // Software License Agreement
  // 
  // Texas Instruments (TI) is supplying this software for use solely and
  // exclusively on TI's microcontroller products. The software is owned by
  // TI and/or its suppliers, and is protected under applicable copyright
  // laws. You may not combine this software with "viral" open-source
  // software in order to form a larger program.
  // 
  // THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
  // NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
  // NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
  // CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
  // DAMAGES, FOR ANY REASON WHATSOEVER.
  // 
  // This is part of revision 2.2.0.295 of the Tiva Firmware Development Package.
  //
  //*****************************************************************************
  
  #ifndef __SENSORLIB_ISL29023_H__
  #define __SENSORLIB_ISL29023_H__
  
  //*****************************************************************************
  //
  // If building with a C++ compiler, make all of the definitions in this header
  // have a C binding.
  //
  //*****************************************************************************
  #ifdef __cplusplus
  extern "C"
  {
  #endif
  
  //*****************************************************************************
  //
  // The structure that defines the internal state of the ISL29023 driver.
  //
  //*****************************************************************************
  typedef struct
  {
      //
      // The pointer to the I2C master interface instance used to communicate
      // with the ISL29023.
      //
      tI2CMInstance *psI2CInst;
  
      //
      // The I2C address of the ISL29023.
      //
      uint8_t ui8Addr;
  
      //
      // The state of the state machine used while accessing the ISL29023.
      //
      uint8_t ui8State;
  
      //
      // The data buffer used for sending/receiving data to/from the ISL29023.
      //
      uint8_t pui8Data[4];
  
      //
      // Instance copy of the range setting.  Used in GetFloat functions
      //
      uint8_t ui8Range;
  
      //
      // The new range, which is used when a register write succeeds.
      //
      uint8_t ui8NewRange;
  
      //
      // Instance copy of the resolution setting.  Used in GetFloat function.
      //
      uint8_t ui8Resolution;
  
      //
      // The new resolution, which is used when a register write succeeds.
      //
      uint8_t ui8NewResolution;
  
      //
      // The function that is called when the current request has completed
      // processing.
      //
      tSensorCallback *pfnCallback;
  
      //
      // The pointer provided to the callback function.
      //
      void *pvCallbackData;
  
      //
      // A union of structures that are used for read, write and
      // read-modify-write operations.  Since only one operation can be active at
      // a time, it is safe to re-use the memory in this manner.
      //
      union
      {
          //
          // A buffer used to store the write portion of a register read.
          //
          uint8_t pui8Buffer[3];
  
          //
          // The write state used to write register values.
          //
          tI2CMWrite8 sWriteState;
  
          //
          // The read-modify-write state used to modify register values.
          //
          tI2CMReadModifyWrite8 sReadModifyWriteState;
      }
      uCommand;
  }
  tISL29023;
  
  //*****************************************************************************
  //
  // Function prototypes.
  //
  //*****************************************************************************
  extern uint_fast8_t ISL29023Init(tISL29023 *psInst, tI2CMInstance *psI2CInst,
                                   uint_fast8_t ui8I2CAddr,
                                   tSensorCallback *pfnCallback,
                                   void *pvCallbackData);
  extern uint_fast8_t ISL29023Read(tISL29023 *psInst, uint_fast8_t ui8Reg,
                                   uint8_t *pui8Data, uint_fast16_t ui16Count,
                                   tSensorCallback *pfnCallback,
                                   void *pvCallbackData);
  extern uint_fast8_t ISL29023Write(tISL29023 *psInst, uint_fast8_t ui8Reg,
                                   uint8_t *pui8Data, uint_fast16_t ui16Count,
                                   tSensorCallback *pfnCallback,
                                   void *pvCallbackData);
  extern uint_fast8_t ISL29023ReadModifyWrite(tISL29023 *psInst,
                                              uint_fast8_t ui8Reg,
                                              uint8_t ui8Mask, uint8_t ui8Value,
                                              tSensorCallback *pfnCallback,
                                              void *pvCallbackData);
  extern uint_fast8_t ISL29023DataRead(tISL29023 *psInst,
                                       tSensorCallback *pfnCallback,
                                       void *pvCallbackData);
  extern void ISL29023DataLightVisibleGetRaw(tISL29023 *psInst,
                                             uint16_t *pui16Visible);
  extern void ISL29023DataLightVisibleGetFloat(tISL29023 *psInst,
                                              float *pfVisible);
  extern void ISL29023DataLightIRGetRaw(tISL29023 *psInst, uint16_t *pui16IR);
  extern void ISL29023DataLightIRGetFloat(tISL29023 *psInst, float *pfIR);
  
  //*****************************************************************************
  //
  // Mark the end of the C bindings section for C++ compilers.
  //
  //*****************************************************************************
  #ifdef __cplusplus
  }
  #endif
  
  #endif // __SENSORLIB_ISL29023_H__
  
  