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/*******************************************************************************
* Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved.
*
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*******************************************************************************
* @file max31725_cpp.h
*******************************************************************************
*/
#ifndef MAX31725_CPP_H
#define MAX31725_CPP_H
#include "mbed.h"


/**
 * @brief Digital thermometer, thermostat, temperature sensor.
 * @version 1.0000.0002
 *
 * @details The MAX31725, MAX31726 temperature sensors
 * provides accurate temperature measurements.
 * Extended format allows for high temperature readings up to 150°C. 
 * The MAX31725 can operate in a low powered mode by utilizing
 * the shutdown and one-shot mode.
 * 8-pin TQDFN 3x3 mm package
 * Accuracy is +-0.5°C from -40°C to +105°C (-40°F to +221°).
 * Operating temperature: -55°C to +150°C (-67°F to +302°).
 * VDD: 2.5V to 3.7V.
 *
 * @code 
 * #include "mbed.h"
 * #include "max32630fthr.h"
 * #include "max31725.h"
 * #include "USBSerial.h"
 * MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); 
 * I2C i2cBus(P3_4, P3_5);
 * int main()
 * {
 *     float temperature;
 *     DigitalOut rLED(LED1, LED_OFF);
 *     DigitalOut gLED(LED2, LED_OFF);
 *     DigitalOut bLED(LED3, LED_OFF);
 *     gLED = LED_ON;
 *     MAX31725 temp_sensor(i2cBus, MAX31725_I2C_SLAVE_ADR_00);
 *     i2cBus.frequency(400000);
 *        temperature =
 *            temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE);
 *        printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", 
 *            temperature, temp_sensor.celsius_to_fahrenheit(temperature));
 * }
 * @endcode
 */

class MAX31725
{
    public:

    /**********************************************************//**
     * @brief Constructor for MAX31725 Class.  
     * 
     * @details Allows user to use existing I2C object
     *
     * On Entry:
     *     @param[in] i2c_bus - pointer to existing I2C object
     *     @param[in] i2c_adrs - 7-bit slave address of MAX31725
     *
     * On Exit:
     *
     * @return None
     **************************************************************/
    MAX31725(I2C &i2c_bus, uint8_t slave_address);
 
    /**********************************************************//**
     * @brief Default destructor for MAX31725 Class.  
     *
     * @details Destroys I2C object if owner 
     *
     * On Entry:
     *
     * On Exit:
     *
     * @return None
     **************************************************************/
    ~MAX31725();

    /**
     * @brief  Read register of device at slave address
     * @param[out] value - Read data on success
     * @return 0 on success, negative number on failure
     */
    int read_cfg_reg(uint8_t *value);

    /**
     * @brief  Read register of device at slave address
     * @param[out] value - Read data on success
     * @param reg - Register address
     * @return 0 on success, negative number on failure
     */
    int read_reg16(int16_t *value, char reg);

    /** 
     * @brief Reads the temperature registers
     * @param reg - the address of the temperature register
     * @return temperature in degrees Celsius
     */
    float read_reg_as_temperature(uint8_t reg);

    /** 
     * @brief Writes to the configuration register
     * @param cfg - configurate word
     * @return 0 on success, negative number on failure
     */
     int write_cfg_reg(uint8_t cfg);

    /** 
     * @brief Writes to the THYST register
     * @param temperature - the temperature in Celsius degrees
     * @return 0 on success, negative number on failure
     */
     int write_trip_low_thyst(float temperature);

    /** 
     * @brief Writes to the TOS register
     * @param temperature - the temperature in Celsius degrees
     * @return 0 on success, negative number on failure
     */
     int write_trip_high_tos(float temperature);

    /** 
     * @brief Converts Celsius degrees to Fahrenheit
     * @param temp_c - the temperature in Celsius degrees
     * @return temperature in Celsius degrees
     */
     float celsius_to_fahrenheit(float temp_c);

protected: 
    /** 
     * @brief Write a value to a register
     * @param value - value to write to the register
     * @param reg - register address
     * @return 0 on success, negative number on failure
     */
    int write_reg16(int16_t value, char reg);

private:
    /** @var m_i2c
     * @brief I2C object
     */
    I2C &m_i2c;
    /** @var m_write_address, m_read_address
     * @brief I2C address
     */
    uint8_t m_write_address, m_read_address;
    /** @var m_extended_format
     * @brief Extended format,  add 64°C to the temperature reading
     */
    uint32_t max31725_extended_format;

};

#endif/* MAX31725_CPP_H */