#pragma once
//
//    FILE: AS5600.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.5.1
// PURPOSE: Arduino library for AS5600 magnetic rotation meter
//    DATE: 2022-05-28
//     URL: https://github.com/RobTillaart/AS5600


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


#define AS5600_LIB_VERSION              (F("0.5.1"))

//  default addresses
const uint8_t AS5600_DEFAULT_ADDRESS    = 0x36;
const uint8_t AS5600L_DEFAULT_ADDRESS   = 0x40;
const uint8_t AS5600_SW_DIRECTION_PIN   = 255;

//  setDirection
const uint8_t AS5600_CLOCK_WISE         = 0;  //  LOW
const uint8_t AS5600_COUNTERCLOCK_WISE  = 1;  //  HIGH

//  0.087890625;
const float   AS5600_RAW_TO_DEGREES     = 360.0 / 4096;
const float   AS5600_DEGREES_TO_RAW     = 4096 / 360.0;
//  0.00153398078788564122971808758949;
const float   AS5600_RAW_TO_RADIANS     = PI * 2.0 / 4096;
//  4.06901041666666e-6
const float   AS5600_RAW_TO_RPM         = 60.0 / 4096;

//  getAngularSpeed
const uint8_t AS5600_MODE_DEGREES       = 0;
const uint8_t AS5600_MODE_RADIANS       = 1;
const uint8_t AS5600_MODE_RPM           = 2;

//  CONFIGURE CONSTANTS
//  check datasheet for details

//  setOutputMode
const uint8_t AS5600_OUTMODE_ANALOG_100 = 0;
const uint8_t AS5600_OUTMODE_ANALOG_90  = 1;
const uint8_t AS5600_OUTMODE_PWM        = 2;

//  setPowerMode
const uint8_t AS5600_POWERMODE_NOMINAL  = 0;
const uint8_t AS5600_POWERMODE_LOW1     = 1;
const uint8_t AS5600_POWERMODE_LOW2     = 2;
const uint8_t AS5600_POWERMODE_LOW3     = 3;

//  setPWMFrequency
const uint8_t AS5600_PWM_115            = 0;
const uint8_t AS5600_PWM_230            = 1;
const uint8_t AS5600_PWM_460            = 2;
const uint8_t AS5600_PWM_920            = 3;

//  setHysteresis
const uint8_t AS5600_HYST_OFF           = 0;
const uint8_t AS5600_HYST_LSB1          = 1;
const uint8_t AS5600_HYST_LSB2          = 2;
const uint8_t AS5600_HYST_LSB3          = 3;

//  setSlowFilter
const uint8_t AS5600_SLOW_FILT_16X      = 0;
const uint8_t AS5600_SLOW_FILT_8X       = 1;
const uint8_t AS5600_SLOW_FILT_4X       = 2;
const uint8_t AS5600_SLOW_FILT_2X       = 3;

//  setFastFilter
const uint8_t AS5600_FAST_FILT_NONE     = 0;
const uint8_t AS5600_FAST_FILT_LSB6     = 1;
const uint8_t AS5600_FAST_FILT_LSB7     = 2;
const uint8_t AS5600_FAST_FILT_LSB9     = 3;
const uint8_t AS5600_FAST_FILT_LSB18    = 4;
const uint8_t AS5600_FAST_FILT_LSB21    = 5;
const uint8_t AS5600_FAST_FILT_LSB24    = 6;
const uint8_t AS5600_FAST_FILT_LSB10    = 7;

//  setWatchDog
const uint8_t AS5600_WATCHDOG_OFF       = 0;
const uint8_t AS5600_WATCHDOG_ON        = 1;



class AS5600
{
public:
  AS5600(TwoWire *wire = &Wire);

  bool     begin(uint8_t directionPin = AS5600_SW_DIRECTION_PIN);
  bool     isConnected();

  //  address = fixed   0x36 for AS5600, 
  //          = default 0x40 for AS5600L
  uint8_t  getAddress();


  //  SET CONFIGURE REGISTERS
  //  read datasheet first

  //  0         = AS5600_CLOCK_WISE
  //  1         = AS5600_COUNTERCLOCK_WISE
  //  all other = AS5600_COUNTERCLOCK_WISE
  void     setDirection(uint8_t direction = AS5600_CLOCK_WISE);
  uint8_t  getDirection();

  uint8_t  getZMCO();

  //  0 .. 4095
  //  returns false if parameter out of range
  bool     setZPosition(uint16_t value);
  uint16_t getZPosition();

  //  0 .. 4095
  //  returns false if parameter out of range
  bool     setMPosition(uint16_t value);
  uint16_t getMPosition();

  //  0 .. 4095
  //  returns false if parameter out of range
  bool     setMaxAngle(uint16_t value);
  uint16_t getMaxAngle();

  //  access the whole configuration register
  //  check datasheet for bit fields
  //  returns false if parameter out of range
  bool     setConfigure(uint16_t value);
  uint16_t getConfigure();

  //  access details of the configuration register
  //  0 = Normal
  //  1,2,3 are low power mode - check datasheet
  //  returns false if parameter out of range
  bool     setPowerMode(uint8_t powerMode);
  uint8_t  getPowerMode();

  //  0 = off    1 = lsb1    2 = lsb2    3 = lsb3
  //  returns false if parameter out of range
  //  suppresses noise when the magnet is not moving.
  bool     setHysteresis(uint8_t hysteresis);
  uint8_t  getHysteresis();

  //  0 = analog 0-100%
  //  1 = analog 10-90%
  //  2 = PWM
  //  returns false if parameter out of range
  bool     setOutputMode(uint8_t outputMode);
  uint8_t  getOutputMode();

  //  0 = 115    1 = 230    2 = 460    3 = 920 (Hz)
  //  returns false if parameter out of range
  bool     setPWMFrequency(uint8_t pwmFreq);
  uint8_t  getPWMFrequency();

  //  0 = 16x    1 = 8x     2 = 4x     3 = 2x
  //  returns false if parameter out of range
  bool     setSlowFilter(uint8_t mask);
  uint8_t  getSlowFilter();

  //  0 = none   1 = LSB6   2 = LSB7   3 = LSB9
  //  4 = LSB18  5 = LSB21  6 = LSB24  7 = LSB10
  //  returns false if parameter out of range
  bool     setFastFilter(uint8_t mask);
  uint8_t  getFastFilter();

  //  0 = OFF
  //  1 = ON   (auto low power mode)
  //  returns false if parameter out of range
  bool     setWatchDog(uint8_t mask);
  uint8_t  getWatchDog();


  //  READ OUTPUT REGISTERS
  uint16_t rawAngle();
  uint16_t readAngle();

  //  software based offset.
  //  degrees = -359.99 .. 359.99 (preferred)
  //  returns false if abs(parameter) > 36000
  //          => expect loss of precision
  bool     setOffset(float degrees);       //  sets an absolute offset
  float    getOffset();
  bool     increaseOffset(float degrees);  //  adds to existing offset.


  //  READ STATUS REGISTERS
  uint8_t  readStatus();
  uint8_t  readAGC();
  uint16_t readMagnitude();

  //  access detail status register
  bool     detectMagnet();
  bool     magnetTooStrong();
  bool     magnetTooWeak();


  //  BURN COMMANDS
  //  DO NOT UNCOMMENT - USE AT OWN RISK - READ DATASHEET
  //  void burnAngle();
  //  void burnSetting();


  //  Experimental 0.1.2 - to be tested.
  //  approximation of the angular speed in rotations per second.
  //  mode == 1: radians /second
  //  mode == 0: degrees /second  (default)
  float    getAngularSpeed(uint8_t mode = AS5600_MODE_DEGREES);

  //  EXPERIMENTAL CUMULATIVE POSITION
  //  reads sensor and updates cumulative position
  int32_t  getCumulativePosition();
  //  converts last position to whole revolutions.
  int32_t  getRevolutions();
  //  resets position only (not the i)
  //  returns last position but not internal lastPosition.
  int32_t  resetPosition(int32_t position = 0);
  //  resets position and internal lastPosition
  //  returns last position.
  int32_t  resetCumulativePosition(int32_t position = 0);


protected:
  uint8_t  readReg(uint8_t reg);
  uint16_t readReg2(uint8_t reg);
  uint8_t  writeReg(uint8_t reg, uint8_t value);
  uint8_t  writeReg2(uint8_t reg, uint16_t value);

  uint8_t  _address         = AS5600_DEFAULT_ADDRESS;
  uint8_t  _directionPin    = 255;
  uint8_t  _direction       = AS5600_CLOCK_WISE;
  uint8_t  _error           = 0;

  TwoWire*  _wire;

  //  for getAngularSpeed()
  uint32_t _lastMeasurement = 0;
  int16_t  _lastAngle       = 0;

  //  for readAngle() and rawAngle()
  uint16_t _offset          = 0;


  //  EXPERIMENTAL
  //  cumulative position counter
  //  works only if the sensor is read often enough.
  int32_t  _position        = 0;
  int16_t  _lastPosition    = 0;
};


/////////////////////////////////////////////////////////////////////////////
//
// AS5600L
//
class AS5600L : public AS5600
{
public:
  AS5600L(uint8_t address = AS5600L_DEFAULT_ADDRESS, TwoWire *wire = &Wire);

  bool     setAddress(uint8_t address);

  //       UPDT = UPDATE
  //       are these two needed?
  bool     setI2CUPDT(uint8_t value);
  uint8_t  getI2CUPDT();
};


//  -- END OF FILE --