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42 lines
1003 B
C
42 lines
1003 B
C
/*
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* Copyright (C) 2015 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_analog_util
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* @{
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*
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* @file
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* @brief ADC utility function implementation
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include "analog_util.h"
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/* keep a max value to ADC resolution mapping for quick access in the ROM */
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static const int val_max[] = {
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[ADC_RES_6BIT] = 0x003f,
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[ADC_RES_8BIT] = 0x00ff,
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[ADC_RES_10BIT] = 0x03ff,
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[ADC_RES_12BIT] = 0x0fff,
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[ADC_RES_14BIT] = 0x3fff,
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[ADC_RES_16BIT] = 0xffff
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};
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int adc_util_map(int sample, adc_res_t res, int min, int max)
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{
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return ((((max - min) * sample) / val_max[res]) + min);
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}
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float adc_util_mapf(int sample, adc_res_t res, float min, float max)
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{
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return ((((max - min) * sample) / val_max[res]) + min);
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}
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