/******************************************************************************
*  Filename:       aon_batmon.c
*  Revised:        2016-10-06 17:21:09 +0200 (Thu, 06 Oct 2016)
*  Revision:       47343
*
*  Description:    Driver for the AON Battery and Temperature Monitor
*
*  Copyright (c) 2015 - 2017, Texas Instruments Incorporated
*  All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions are met:
*
*  1) Redistributions of source code must retain the above copyright notice,
*     this list of conditions and the following disclaimer.
*
*  2) Redistributions in binary form must reproduce the above copyright notice,
*     this list of conditions and the following disclaimer in the documentation
*     and/or other materials provided with the distribution.
*
*  3) Neither the name of the ORGANIZATION nor the names of its contributors may
*     be used to endorse or promote products derived from this software without
*     specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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******************************************************************************/

#include "aon_batmon.h"
#include "../inc/hw_fcfg1.h"

//*****************************************************************************
//
// Handle support for DriverLib in ROM:
// This section will undo prototype renaming made in the header file
//
//*****************************************************************************
#if !defined(DOXYGEN)
    #undef  AONBatMonTemperatureGetDegC
    #define AONBatMonTemperatureGetDegC     NOROM_AONBatMonTemperatureGetDegC
#endif

//*****************************************************************************
//
// AONBatMonTemperatureGetDegC()
// Returns sign extended temperature in Deg C (-256 .. +255)
//
//*****************************************************************************
int32_t
AONBatMonTemperatureGetDegC( void )
{
   int32_t  signedTemp        ; // Signed extended temperature with 8 fractional bits
   int32_t  tempCorrection    ; // Voltage dependent temp correction with 8 fractional bits
   int8_t   voltageSlope      ; // Signed byte value representing the TEMP slope with battery voltage, in degrees C/V, with 4 fractional bits.

   // Shift left then right to sign extend the BATMON_TEMP field
   signedTemp = ((((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_TEMP ))
     << ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ))
     >> ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ));

   // Typecasting voltageSlope to int8_t prior to assignment in order to make sure sign extension works properly
   // Using byte read (HWREGB) in order to make more efficient code since voltageSlope is assigned to bits[7:0] of FCFG1_O_MISC_TRIM
   voltageSlope      = ((int8_t)HWREGB( FCFG1_BASE + FCFG1_O_MISC_TRIM ));
   tempCorrection    = (( voltageSlope * (((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_BAT )) - 0x300 )) >> 4 );

   return ((( signedTemp - tempCorrection ) + 0x80 ) >> 8 );
}


// See aon_batmon.h for implementation of remaining functions