/**************************************************************************
*
* Copyright (c) 2024-2024 Diality Inc. - All Rights Reserved.
*
* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
*
* @file    PressureCommon.c
*
* @author  (last)      Sean
* @date    (last)      22-Aug-2024
*
* @author  (original)  Sean
* @date    (original)  22-Aug-2024
*
***************************************************************************/

#include "PressureCommon.h"

/**
 *  @addtogroup PressureCommon
 *  @{
 */

// ********** private definitions **********

#define BAR_TO_MMHG                         ( 750.062F )                                    ///< Conversion factor for converting bar to mmHg.

#define PRESSURE_FS                         ( 80.0F )                                       ///< Pressure sensor full scale percentage.
#define PRESSURE_ZERO                       ( 0.0F )                                        ///< Pressure sensor zero value.
#define PRESSURE_FS_RATIO                   ( 0.9F )                                        ///< Pressure sensor full scale ratio.
#define PRESSURE_ZERO_RATIO                 ( 0.1F )                                        ///< Pressure sensor zero ratio.
#define PRESSURE_DIVIDER                    ( 8388608.0F )                                  ///< Pressure sensor divider.

/// Scaler value for converting pressure readings from kPa to bar (100th).
#define PRESSURE_SCALER                     ( ( PRESSURE_FS - PRESSURE_ZERO ) / \
                                              ( PRESSURE_FS_RATIO - PRESSURE_ZERO_RATIO ) )

#define PRESSURE_TEMP_DIVIDER               ( 65536.0F )                                    ///< Pressure sensor temperature divider.
#define PRESSURE_TEMP_OFFSET                ( 25.0F )                                       ///< Pressure sensor temperature offset.

// ********** private data **********


// ********** private function prototypes **********


/*********************************************************************//**
 * @brief
 * The convertPressureReading2mmHg function converts a raw pressure ADC
 * reading from a pressure sensor to mmHg.
 * @details \b Inputs: none
 * @details \b Outputs: none
 * @return Pressure reading in mmHg
 *************************************************************************/
F32 convertPressureReading2mmHg( S32 counts )
{
    F32 pressure_bar, mmHg;

    // Convert raw pressure counts to bar and then to mmHg
    pressure_bar = ( ( (F32)counts / PRESSURE_DIVIDER ) - PRESSURE_ZERO_RATIO ) * PRESSURE_SCALER;
    mmHg         = pressure_bar * BAR_TO_MMHG;

    return mmHg;
}

/*********************************************************************//**
 * @brief
 * The convertPressureTempReading2DegC function converts a raw temperature
 * ADC reading from a pressure sensor to Celsius.
 * @details \b Inputs: none
 * @details \b Outputs: none
 * @return Temperature reading in Celsius
 *************************************************************************/
F32 convertPressureTempReading2DegC( S32 counts )
{
    F32 degC;

    // Convert raw pressure sensor temperatures to deg C
    degC = ( (F32)counts / PRESSURE_TEMP_DIVIDER ) + PRESSURE_TEMP_OFFSET;

    return degC;
}

/**@}*/