max17048.h

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#ifndef LIBPROPELLER_MAX17048_H_
#define LIBPROPELLER_MAX17048_H_

#include "libpropeller/i2c/i2c.h"

class MAX17048 {
public:

    MAX17048() {
        bus_ = NULL;
        status_ = false;
    }

    bool Init(I2C * bus) {
        bus_ = bus;
        GetStatus();
        return status_;
    }

    bool GetStatus(void) {
        status_ = bus_->Ping(kDeviceAddress);
        return status_;
    }

    int GetStateOfCharge(void) {
        int soc = GetShort(kSOC);
        return ((unsigned) soc) >> 8;
    }

    int GetVoltage(void) {
        int voltage = GetShort(kVCELL);

        //Originally units of 78.125uV/LSb,
        //Convert to 1mV/LSb
        voltage = ((voltage * 7812) / 100) / 1000;

        return voltage;
    }

    int GetChargeRate(void) {
        //SRLM doesn't know if this is signed or not, but if it is then sign extend
        //And hopefully, it's not unsigned *and* 16 bits!
        int rate = (GetShort(kCRATE) << 16) >> 16;

        return (rate * 208) / 100;
    }

    int GetVersion(void) {
        return GetShort(kVERSION);
    }


private:

    const static unsigned char kDeviceAddress = 0b01101100;

    const static unsigned char kVCELL = 0x02;
    const static unsigned char kSOC = 0x04;
    const static unsigned char kVERSION = 0x08;
    const static unsigned char kCRATE = 0x16;

    I2C * bus_;
    bool status_;

    int GetShort(char address) {
        char data[2];
        bus_->Get(kDeviceAddress, address, data, 2);
        int result = (data[0] << 8) | data[1];
        return result;
    }

};


#endif // LIBPROPELLER_MAX17048_H_