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Mark Qvist 2014-04-03 22:21:37 +02:00
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/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
* All Rights Reserved.
* -->
*
* \brief Driver for NTC sensors (reads a temperature through an ADC).
*
*
* \author Giovanni Bajo <rasky@develer.com>
* \author Francesco Sacchi <batt@develer.com>
*
* $WIZ$ module_name = "ntc"
* $WIZ$ module_hw = "bertos/hw/hw_ntc.h", "bertos/hw/ntc_map.h", "bertos/hw/hw_ntc.c"
*/
#ifndef DRV_NTC_H
#define DRV_NTC_H
#include "hw/ntc_map.h"
#include <cfg/compiler.h>
#include <cfg/debug.h>
#define NTC_OPEN_CIRCUIT -32768
#define NTC_SHORT_CIRCUIT 32767
typedef int16_t deg_t; /** type for celsius degrees deg_t = °C * 10 */
/** Macro for converting from deg to deg_t type */
#define DEG_TO_DEG_T(x) ((deg_t)((x) * 10))
/** Macro for converting from deg_t to celsius degrees (returns only the integer part) */
#define DEG_T_TO_INTDEG(x) ((x) / 10)
/** Macro for converting from deg_t to celsius degrees (returns only the decimal part) */
#define DEG_T_TO_DECIMALDEG(x) ((x) % 10)
/** Macro for converting from deg_t to celsius degrees (returns type is float) */
#define DEG_T_TO_FLOATDEG(x) ((x) / 10.0)
typedef uint32_t res_t; /** type for resistor res_t = Ohm * 100 */
typedef float amp_t; /** type for defining amplifications amp_t = A, where A is a pure number */
DB(extern bool ntc_initialized;)
/** Describe a NTC chip */
typedef struct NtcHwInfo
{
const res_t *resistances; ///< resistances of the NTC (ohms * 100)
size_t num_resistances; ///< number of resistances
deg_t degrees_min; ///< degrees corresponding to the first entry in the table (celsius * 10)
deg_t degrees_step; ///< difference in degrees between two consecutive elements in the table (celsius * 10)
} NtcHwInfo;
/** Initialize the NTC module */
void ntc_init(void);
/** Read a single temperature value from the NTC */
deg_t ntc_read(NtcDev dev);
#endif /* DRV_NTC_H */