#pragma once
//
//    FILE: MAX14661.h
//  AUTHOR: Rob Tillaart
//    DATE: 2021-01-29
// VERSION: 0.2.0
// PURPOSE: Arduino library for MAX14661 16 channel I2C multiplexer
//     URL: https://github.com/RobTillaart/MAX14661


#include "Arduino.h"
#include "Wire.h"


#define MAX14661_LIB_VERSION                (F("0.2.0"))

#define MAX14661_OK                         0x00
#define MAX14661_ERR_I2C                    0x80   //  Not implemented yet
#define MAX14661_ERR_CHANNEL                0x81   //  Not implemented yet


class MAX14661
{
public:
  explicit MAX14661(const uint8_t deviceAddress, TwoWire *wire = &Wire);

  bool     begin();
  bool     isConnected();
  uint8_t  getAddress();


  //  PAIR INTERFACE
  //  - keeps A and B line in sync, ideal for an I2C bus or Serial.
  //  - returns false if channel > 15
  //
  //  open ==> connect
  bool     openChannel(uint8_t channel);
  //  close ==> disconnect
  bool     closeChannel(uint8_t channel);
  //  returns true if channel is opened
  bool     isOpenChannel(uint8_t channel);

  //  open A and B lines of all channels
  void     openAllChannels();
  //  closes A and B lines of all channels
  void     closeAllChannels();

  //  set channels with a bit mask
  void     setChannels(uint16_t mask);
  //  returns channel state as bit mask
  uint16_t getChannels();


  //  SHADOW INTERFACE
  //  - experimental - not tested.
  //  - prepares channels to be set in one activateShadow().
  //
  void     shadowClear();
  //  should we have activateShadowA() and activateShadowB() ?
  void     activateShadow();

  void     setShadowChannelMaskA(uint16_t mask);
  uint16_t getShadowChannelMaskA();
  void     setShadowChannelMaskB(uint16_t mask);
  uint16_t getShadowChannelMaskB();

  bool     openShadowChannelA(uint8_t channel);
  bool     closeShadowChannelA(uint8_t channel);
  bool     isOpenShadowChannelA(uint8_t channel);

  bool     openShadowChannelB(uint8_t channel);
  bool     closeShadowChannelB(uint8_t channel);
  bool     isOpenShadowChannelB(uint8_t channel);


  //  MUX INTERFACE
  //  - allows only one channel simultaneously open
  //  - opening a channel closes any other.
  //
  void     MUXA(uint8_t channel);  //  0..15, else ==> off
  uint8_t  getMUXA();
  void     MUXB(uint8_t channel);  //  0..15, else ==> off
  uint8_t  getMUXB();


  //  FULL CONTROL PER A and B LINE
  //  - selective open and close A and B
  //  - returns false if channel > 15
  //
  bool     openA(uint8_t channel);
  bool     openB(uint8_t channel);
  bool     closeA(uint8_t channel);
  bool     closeB(uint8_t channel);


  //  LOW LEVEL CONTROL
  //  optional optimizations.
  //  uint8_t  getRegister(uint8_t reg, uint8_t bit);
  //  uint8_t  setRegister(uint8_t reg, uint8_t bit);
  //  uint8_t  clrRegister(uint8_t reg, uint8_t bit);
  //  uint16_t readRegister2(uint8_t reg);  //  2 bytes
  //  int      writeRegister2(uint8_t reg, uint16_t value);  // 2  bytes

  uint8_t  readRegister(uint8_t reg);
  int      writeRegister(uint8_t reg, uint8_t value);
  int      lastError();

private:
  uint8_t  _address;
  TwoWire* _wire;

  int      _error;
};


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