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/* mbed Microcontroller Library
 * Copyright (c) 2017 u-blox
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef BATTERY_GAUGE_BQ35100_H
#define BATTERY_GAUGE_BQ35100_H

/**
 * @file battery_gauge_bq35100.h
 * This file defines the API to the TI BQ35100 battery gauge chip.
 */

/* ----------------------------------------------------------------
 * COMPILE-TIME MACROS
 * -------------------------------------------------------------- */

/** Device I2C address. */
#define BATTERY_GAUGE_BQ35100_ADDRESS 0x55

/** The default seal code. */
#define SEAL_CODE_DEFAULT 0x8000

/* ----------------------------------------------------------------
 * CLASSES
 * -------------------------------------------------------------- */

/** BQ35100 battery gauge driver. */
class BatteryGaugeBq35100 {
public:

    /** Constructor. */
    BatteryGaugeBq35100(void);
    /** Destructor. */
    ~BatteryGaugeBq35100(void);

    /** Initialise the BQ35100 chip.  Once initialised
    * the chip is put into its lowest power state.  Any API call
    * will awaken the chip from this state and then return it once
    * more to the lowest possible power state.
    * @param pI2c a pointer to the I2C instance to use.
    * @param address 7-bit I2C address of the battery gauge chip.
    * @param sealCode the 16 bit seal code that will unseal the device if it is sealed.
    * @return true if successful, otherwise false.
    */
    bool init (I2C * pI2c, uint8_t address = BATTERY_GAUGE_BQ35100_ADDRESS, uint16_t sealCode = SEAL_CODE_DEFAULT);
    
protected:
    /** Pointer to the I2C interface. */
    I2C * gpI2c;
    /** The address of the device. */
    uint8_t gAddress;
    /** The seal code for the device. */
    uint16_t gSealCode;
    /** Flag to indicate device is ready. */
    bool gReady;
    
    /** Read two bytes starting at a given address.
    * Note: gpI2c should be locked before this is called.
    * @param registerAddress the register address to start reading from.
    * @param pBytes place to put the two bytes.
    * @return true if successful, otherwise false.
    */
    bool getTwoBytes (uint8_t registerAddress, uint16_t *pBytes);

};

#endif

/* End Of File */