/*
 *   DS2438.h
 *
 *   by Joe Bechter
 *
 *   (C) 2012, bechter.com
 *
 *   All files, software, schematics and designs are provided as-is with no warranty.
 *   All files, software, schematics and designs are for experimental/hobby use.
 *   Under no circumstances should any part be used for critical systems where safety,
 *   life or property depends upon it. You are responsible for all use.
 *   You are free to use, modify, derive or otherwise extend for your own non-commercial purposes provided
 *       1. No part of this software or design may be used to cause injury or death to humans or animals.
 *       2. Use is non-commercial.
 *       3. Credit is given to the author (i.e. portions © bechter.com), and provide a link to the original source.
 *
 */

#ifndef DS2438_h
#define DS2438_h

#include <Arduino.h>
#include <OneWire.h>

#define DS2438_TEMPERATURE_CONVERSION_COMMAND 0x44
#define DS2438_VOLTAGE_CONVERSION_COMMAND 0xb4
#define DS2438_WRITE_SCRATCHPAD_COMMAND 0x4e
#define DS2438_COPY_SCRATCHPAD_COMMAND 0x48
#define DS2438_READ_SCRATCHPAD_COMMAND 0xbe
#define DS2438_RECALL_MEMORY_COMMAND 0xb8

#define PAGE_MIN 0
#define PAGE_MAX 7

#define DS2438_CHA 0
#define DS2438_CHB 1

#define DS2438_MODE_CHA 0x01
#define DS2438_MODE_CHB 0x02
#define DS2438_MODE_TEMPERATURE 0x04

#define DS2438_TEMPERATURE_DELAY 10
#define DS2438_VOLTAGE_CONVERSION_DELAY 8

#define DEFAULT_PAGE0(var) uint8_t var[8] { \
    0b00001011 /* X, ADB=0, NVB=0, TB=0, AD=1, EE=0, CA=1, IAD=1 */, \
    0, /* Temperatur */ \
    0, /* Temperatur */ \
    0, /* Voltage */ \
    0, /* Voltage */ \
    0, /* Current */ \
    0, /* Current */ \
    0 /* Threashold */ \
}

typedef struct PageOne {
    uint8_t eleapsedTimerByte0; /**< LSB of timestamp */
    uint8_t eleapsedTimerByte1;
    uint8_t eleapsedTimerByte2;
    uint8_t eleapsedTimerByte3; /**< MSB of timestamp */
    uint8_t ICA; /**< Integrated Current Accumulator (current flowing into and out of the battery) */
    uint8_t offsetRegisterByte0; /**< Offset for ADC calibdation */
    uint8_t offsetRegisterByte1; /**< Offset for ADC calibdation */
    uint8_t reserved;
} PageOne_t;

typedef struct PageSeven {
    uint8_t userByte0;
    uint8_t userByte1;
    uint8_t userByte2;
    uint8_t userByte3;
    uint8_t CCA0;   /**< Charging Current Accumulator (CCA) */
    uint8_t CCA1;   /**< Charging Current Accumulator (CCA) */
    uint8_t DCA0;   /**< Discharge Current Accumulator (DCA) */
    uint8_t DCA1;   /**< Discharge Current Accumulator (DCA) */
} PageSeven_t;

typedef uint8_t DeviceAddress[8];

class DS2438 {
    public:
        DS2438(OneWire *ow, float currentShunt);
        DS2438(OneWire *ow, uint8_t *address);

        void begin();
        void update();
        double getTemperature();
        float getVoltage(int channel=DS2438_CHA);
        float getCurrent();
        long getICA();
        long getCCA();
        long getDCA();
        float getAh();
        boolean isError();
        boolean isFound();
    private:
        bool validAddress(const uint8_t*);
        bool validFamily(const uint8_t* deviceAddress);
        
        bool deviceFound = false;
        OneWire *_ow;
        DeviceAddress _address;
        uint8_t _mode;
        double _temperature;
        float _voltageA;
        float _voltageB;
        float _current;
        float _currentShunt;
        long _CCA;
        long _DCA;
        long _ICA;
        boolean _error;
        boolean startConversion(int channel, boolean doTemperature);
        boolean selectChannel(int channel);
        void writePage(int page, uint8_t *data);
        boolean readPage(int page, uint8_t *data);
};

#endif