91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
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* All Rights Reserved.
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* -->
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*
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* \brief Driver for NTC sensors (reads a temperature through an ADC).
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*
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*
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* \author Giovanni Bajo <rasky@develer.com>
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* \author Francesco Sacchi <batt@develer.com>
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*
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* $WIZ$ module_name = "ntc"
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* $WIZ$ module_hw = "bertos/hw/hw_ntc.h", "bertos/hw/ntc_map.h", "bertos/hw/hw_ntc.c"
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*/
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#ifndef DRV_NTC_H
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#define DRV_NTC_H
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#include "hw/ntc_map.h"
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#include <cfg/compiler.h>
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#include <cfg/debug.h>
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#define NTC_OPEN_CIRCUIT -32768
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#define NTC_SHORT_CIRCUIT 32767
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typedef int16_t deg_t; /** type for celsius degrees deg_t = °C * 10 */
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/** Macro for converting from deg to deg_t type */
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#define DEG_TO_DEG_T(x) ((deg_t)((x) * 10))
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/** Macro for converting from deg_t to celsius degrees (returns only the integer part) */
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#define DEG_T_TO_INTDEG(x) ((x) / 10)
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/** Macro for converting from deg_t to celsius degrees (returns only the decimal part) */
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#define DEG_T_TO_DECIMALDEG(x) ((x) % 10)
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/** Macro for converting from deg_t to celsius degrees (returns type is float) */
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#define DEG_T_TO_FLOATDEG(x) ((x) / 10.0)
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typedef uint32_t res_t; /** type for resistor res_t = Ohm * 100 */
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typedef float amp_t; /** type for defining amplifications amp_t = A, where A is a pure number */
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DB(extern bool ntc_initialized;)
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/** Describe a NTC chip */
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typedef struct NtcHwInfo
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{
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const res_t *resistances; ///< resistances of the NTC (ohms * 100)
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size_t num_resistances; ///< number of resistances
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deg_t degrees_min; ///< degrees corresponding to the first entry in the table (celsius * 10)
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deg_t degrees_step; ///< difference in degrees between two consecutive elements in the table (celsius * 10)
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} NtcHwInfo;
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/** Initialize the NTC module */
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void ntc_init(void);
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/** Read a single temperature value from the NTC */
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deg_t ntc_read(NtcDev dev);
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#endif /* DRV_NTC_H */
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