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aon_batmon.c
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1 /******************************************************************************
2 * Filename: aon_batmon.c
3 * Revised: 2015-01-15 11:07:05 +0100 (to, 15 jan 2015)
4 * Revision: 42389
5 *
6 * Description: Driver for the AON Battery and Temperature Monitor
7 *
8 * Copyright (c) 2015, 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 <driverlib/aon_batmon.h>
40 #include <inc/hw_fcfg1.h>
41
42 //*****************************************************************************
43 // Need to know the AON_BATMON:TEMP.INT fild width in order to sign extend correctly
44 // (This is not given in the hw_aon_batmon.h file and therefore hard coded here)
45 //*****************************************************************************
46 #define AON_BATMON_TEMP_INT_FIELD_WIDTH 9
47
48 //*****************************************************************************
49 //
50 // AON_BatmonTempGetDegC()
51 // Returns sign exteded temperature in Deg C (-256 .. +255)
52 //
53 //*****************************************************************************
54 int32_t
55 AON_BatmonTempGetDegC( void )
56 {
57 int32_t signedTemp ; // Signed extended temperature with 8 fractional bits
58 int32_t tempCorrection ; // Voltage dependent temp correction with 8 fractional bits
59 int8_t voltageSlope ; // Signed byte value representing the TEMP slope with battery voltage, in degrees C/V, with 4 fractional bits.
60
61 //
62 // Shift left then right to sign extend the BATMON_TEMP field
63 //
64 signedTemp = ((((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_TEMP ))
65 << ( 32 - AON_BATMON_TEMP_INT_FIELD_WIDTH - AON_BATMON_TEMP_INT_S ))
66 >> ( 32 - AON_BATMON_TEMP_INT_FIELD_WIDTH - AON_BATMON_TEMP_INT_S ));
67
68 //
69 // Typecasting voltageSlope to int8_t prior to assignment in order to make sure sign extension works properly
70 // Using byte read (HWREGB) in order to make more efficient code since FCFG1_O_MISC_TRIM is assigned to bits[7:0]
71 //
72 voltageSlope = ((int8_t)HWREGB( FCFG1_BASE + FCFG1_O_MISC_TRIM ));
73 tempCorrection = (( voltageSlope * (((int32_t)HWREG( AON_BATMON_BASE + AON_BATMON_O_BAT )) - 0x300 )) >> 4 );
74
75 return ((( signedTemp - tempCorrection ) + 0x80 ) >> 8 );
76 }
77
78
79 // See aon_batmon.h for implementation of remaining functions
AON_BATMON_TEMP_INT_FIELD_WIDTH
#define AON_BATMON_TEMP_INT_FIELD_WIDTH
Definition: aon_batmon.c:46
AON_BatmonTempGetDegC
int32_t AON_BatmonTempGetDegC(void)
Get the current temperature measurement as a signed value in Deg Celsius.
Definition: aon_batmon.c:55
aon_batmon.h