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