1 /******************************************************************************
2 * Filename: aon_batmon.c
3 * Revised: 2016-10-06 17:21:09 +0200 (Thu, 06 Oct 2016)
4 * Revision: 47343
5 *
6 * Description: Driver for the AON Battery and Temperature Monitor
7 *
8 * Copyright (c) 2015 - 2020, Texas Instruments Incorporated
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are met:
13 *
14 * 1) Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 *
17 * 2) Redistributions in binary form must reproduce the above copyright notice,
18 * this list of conditions and the following disclaimer in the documentation
19 * and/or other materials provided with the distribution.
20 *
21 * 3) Neither the name of the ORGANIZATION nor the names of its contributors may
22 * be used to endorse or promote products derived from this software without
23 * specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 *
37 ******************************************************************************/
38
39 #include "aon_batmon.h"
40 #include "../inc/hw_fcfg1.h"
41
42 //*****************************************************************************
43 //
44 // Handle support for DriverLib in ROM:
45 // This section will undo prototype renaming made in the header file
46 //
47 //*****************************************************************************
48 #if !defined(DOXYGEN)
49 #undef AONBatMonTemperatureGetDegC
50 #define AONBatMonTemperatureGetDegC NOROM_AONBatMonTemperatureGetDegC
51 #endif
52
53 //*****************************************************************************
54 //
55 // AONBatMonTemperatureGetDegC()
56 // Returns sign extended temperature in Deg C (-256 .. +255)
57 //
58 //*****************************************************************************
59 int32_t
AONBatMonTemperatureGetDegC(void)60 AONBatMonTemperatureGetDegC( void )
61 {
62 int32_t signedTemp ; // Signed extended temperature with 8 fractional bits
63 int32_t tempCorrection ; // Voltage dependent temp correction with 8 fractional bits
64 int8_t voltageSlope ; // Signed byte value representing the TEMP slope with battery voltage, in degrees C/V, with 4 fractional bits.
65
66 // Shift left then right to sign extend the BATMON_TEMP field
67 signedTemp = ((((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_TEMP ))
68 << ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ))
69 >> ( 32 - AON_BATMON_TEMP_INT_W - AON_BATMON_TEMP_INT_S ));
70
71 // Typecasting voltageSlope to int8_t prior to assignment in order to make sure sign extension works properly
72 // Using byte read (HWREGB) in order to make more efficient code since voltageSlope is assigned to bits[7:0] of FCFG1_O_MISC_TRIM
73 voltageSlope = ((int8_t)HWREGB( FCFG1_BASE + FCFG1_O_MISC_TRIM ));
74 tempCorrection = (( voltageSlope * (((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_BAT )) - 0x300 )) >> 4 );
75
76 return ((( signedTemp - tempCorrection ) + 0x80 ) >> 8 );
77 }
78
79
80 // See aon_batmon.h for implementation of remaining functions
81
