148 lines
5.4 KiB
C
148 lines
5.4 KiB
C
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2012.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief NTC Temperature Sensor board hardware driver.
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*
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* Master include file for the board temperature sensor driver, for the USB boards which contain a temperature sensor.
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*/
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/** \ingroup Group_BoardDrivers
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* \defgroup Group_Temperature Temperature Sensor Driver - LUFA/Drivers/Board/Temperature.h
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* \brief NTC Temperature Sensor board hardware driver.
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - LUFA/Drivers/Board/Temperature.c <i>(Makefile source module name: LUFA_SRC_TEMPERATURE)</i>
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*
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* \section Sec_ModDescription Module Description
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* Temperature sensor driver. This provides an easy to use interface for the hardware temperature sensor located
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* on many boards. It provides an interface to configure the sensor and appropriate ADC channel, plus read out the
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* current temperature in degrees C. It is designed for and will only work with the temperature sensor located on the
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* official Atmel USB AVR boards, as each sensor has different characteristics.
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*
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* \section Sec_ExampleUsage Example Usage
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* The following snippet is an example of how this module may be used within a typical
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* application.
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*
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* \code
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* // Initialize the ADC and board temperature sensor drivers before first use
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* ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_128);
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* Temperature_Init();
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*
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* // Display converted temperature in degrees Celsius
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* printf("Current Temperature: %d Degrees\r\n", Temperature_GetTemperature());
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* \endcode
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*
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* @{
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*/
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#ifndef __TEMPERATURE_H__
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#define __TEMPERATURE_H__
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/* Includes: */
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#include "../../Common/Common.h"
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/* Preprocessor Checks: */
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#if ((BOARD == BOARD_USBKEY) || (BOARD == BOARD_STK525) || \
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(BOARD == BOARD_STK526) || (BOARD == BOARD_EVK527))
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#define TEMPERATURE_SENSOR_DRIVER_COMPATIBLE
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#endif
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#if !defined(__INCLUDE_FROM_TEMPERATURE_C) && !defined(TEMPERATURE_SENSOR_DRIVER_COMPATIBLE)
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#error The selected board does not contain a compatible temperature sensor.
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#endif
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#if defined(TEMPERATURE_SENSOR_DRIVER_COMPATIBLE)
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/* Includes: */
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#include "../Peripheral/ADC.h"
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** ADC channel number for the temperature sensor. */
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#define TEMP_ADC_CHANNEL 0
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/** ADC channel MUX mask for the temperature sensor. */
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#define TEMP_ADC_CHANNEL_MASK ADC_CHANNEL0
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/** Size of the temperature sensor lookup table, in lookup values */
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#define TEMP_TABLE_SIZE 120
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/** Minimum returnable temperature from the \ref Temperature_GetTemperature() function. */
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#define TEMP_MIN_TEMP TEMP_TABLE_OFFSET_DEGREES
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/** Maximum returnable temperature from the \ref Temperature_GetTemperature() function. */
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#define TEMP_MAX_TEMP ((TEMP_TABLE_SIZE - 1) + TEMP_TABLE_OFFSET_DEGREES)
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/* Inline Functions: */
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/** Initializes the temperature sensor driver, including setting up the appropriate ADC channel.
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* This must be called before any other temperature sensor routines.
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*
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* \pre The ADC itself (not the ADC channel) must be configured separately before calling the
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* temperature sensor functions.
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*/
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static inline void Temperature_Init(void) ATTR_ALWAYS_INLINE;
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static inline void Temperature_Init(void)
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{
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ADC_SetupChannel(TEMP_ADC_CHANNEL);
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}
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/* Function Prototypes: */
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/** Performs a complete ADC on the temperature sensor channel, and converts the result into a
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* valid temperature between \ref TEMP_MIN_TEMP and \ref TEMP_MAX_TEMP in degrees Celsius.
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*
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* \return Signed temperature value in degrees Celsius.
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*/
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int8_t Temperature_GetTemperature(void) ATTR_WARN_UNUSED_RESULT;
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Macros: */
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#define TEMP_TABLE_OFFSET_DEGREES -21
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#endif
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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#endif
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/** @} */
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