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81 lines
3.9 KiB
C
81 lines
3.9 KiB
C
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/******************************************************************************
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* Filename: aon_batmon.c
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* Revised: 2016-10-06 17:21:09 +0200 (Thu, 06 Oct 2016)
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* Revision: 47343
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*
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* Description: Driver for the AON Battery and Temperature Monitor
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*
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* Copyright (c) 2015 - 2017, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of the ORGANIZATION nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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#include "aon_batmon.h"
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#include "../inc/hw_fcfg1.h"
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//*****************************************************************************
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//
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// Handle support for DriverLib in ROM:
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// This section will undo prototype renaming made in the header file
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//
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//*****************************************************************************
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#if !defined(DOXYGEN)
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#undef AONBatMonTemperatureGetDegC
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#define AONBatMonTemperatureGetDegC NOROM_AONBatMonTemperatureGetDegC
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#endif
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//*****************************************************************************
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//
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// AONBatMonTemperatureGetDegC()
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// Returns sign extended temperature in Deg C (-256 .. +255)
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//
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//*****************************************************************************
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int32_t
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AONBatMonTemperatureGetDegC( void )
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{
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int32_t signedTemp ; // Signed extended temperature with 8 fractional bits
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int32_t tempCorrection ; // Voltage dependent temp correction with 8 fractional bits
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int8_t voltageSlope ; // Signed byte value representing the TEMP slope with battery voltage, in degrees C/V, with 4 fractional bits.
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// Shift left then right to sign extend the BATMON_TEMP field
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signedTemp = ((((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_TEMP ))
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<< ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ))
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>> ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ));
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// Typecasting voltageSlope to int8_t prior to assignment in order to make sure sign extension works properly
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// Using byte read (HWREGB) in order to make more efficient code since voltageSlope is assigned to bits[7:0] of FCFG1_O_MISC_TRIM
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voltageSlope = ((int8_t)HWREGB( FCFG1_BASE + FCFG1_O_MISC_TRIM ));
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tempCorrection = (( voltageSlope * (((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_BAT )) - 0x300 )) >> 4 );
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return ((( signedTemp - tempCorrection ) + 0x80 ) >> 8 );
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}
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// See aon_batmon.h for implementation of remaining functions
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