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323 lines
13 KiB
323 lines
13 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 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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*
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* ADC driver for the 8-Bit AVRs containing a hardware ADC module.
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*
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* \note This file should not be included directly. It is automatically included as needed by the ADC driver
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* dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
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*/
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/** \ingroup Group_ADC
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* @defgroup Group_ADC_AVR8 8-Bit AVR ADC Driver
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*
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* ADC driver for 8-Bit AVRs containing a hardware ADC module.
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*
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* \note This file should not be included directly. It is automatically included as needed by the ADC driver
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* dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
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*
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* @{
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*/
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#ifndef __ADC_AVR8_H__
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#define __ADC_AVR8_H__
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/* Includes: */
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#include "../../../Common/Common.h"
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#include <avr/io.h>
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#include <stdbool.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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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_ADC_H)
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#error Do not include this file directly. Include LUFA/Drivers/Peripheral/ADC.h instead.
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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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/** Reference mask, for using the voltage present at the AVR's AREF pin for the ADC reference. */
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#define ADC_REFERENCE_AREF 0
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/** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */
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#define ADC_REFERENCE_AVCC (1 << REFS0)
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/** Reference mask, for using the internally generated 2.56V reference voltage as the ADC reference. */
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#define ADC_REFERENCE_INT2560MV ((1 << REFS1)| (1 << REFS0))
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/** Left-adjusts the 10-bit ADC result, so that the upper 8 bits of the value returned by the
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* ADC_GetResult() macro contain the 8 most significant bits of the result. */
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#define ADC_LEFT_ADJUSTED (1 << ADLAR)
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/** Right-adjusts the 10-bit ADC result, so that the lower 8 bits of the value returned by the
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* ADC_GetResult() macro contain the 8 least significant bits of the result. */
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#define ADC_RIGHT_ADJUSTED (0 << ADLAR)
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/** Sets the ADC mode to free running, so that conversions take place continuously as fast as the ADC
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* is capable of at the given input clock speed. */
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#define ADC_FREE_RUNNING (1 << ADATE)
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/** Sets the ADC mode to single conversion, so that only a single conversion will take place before
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* the ADC returns to idle. */
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#define ADC_SINGLE_CONVERSION (0 << ADATE)
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/** Sets the ADC input clock to prescale by a factor of 2 the AVR's system clock. */
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#define ADC_PRESCALE_2 (1 << ADPS0)
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/** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */
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#define ADC_PRESCALE_4 (1 << ADPS1)
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/** Sets the ADC input clock to prescale by a factor of 8 the AVR's system clock. */
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#define ADC_PRESCALE_8 ((1 << ADPS0) | (1 << ADPS1))
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/** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */
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#define ADC_PRESCALE_16 (1 << ADPS2)
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/** Sets the ADC input clock to prescale by a factor of 32 the AVR's system clock. */
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#define ADC_PRESCALE_32 ((1 << ADPS2) | (1 << ADPS0))
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/** Sets the ADC input clock to prescale by a factor of 64 the AVR's system clock. */
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#define ADC_PRESCALE_64 ((1 << ADPS2) | (1 << ADPS1))
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/** Sets the ADC input clock to prescale by a factor of 128 the AVR's system clock. */
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#define ADC_PRESCALE_128 ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0))
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//@{
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/** MUX mask define for the ADC0 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL0 0x00
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/** MUX mask define for the ADC1 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL1 0x01
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#if !(defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
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/** MUX mask define for the ADC2 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL2 0x02
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/** MUX mask define for the ADC3 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL3 0x03
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#endif
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/** MUX mask define for the ADC4 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL4 0x04
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/** MUX mask define for the ADC5 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL5 0x05
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/** MUX mask define for the ADC6 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL6 0x06
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/** MUX mask define for the ADC7 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_CHANNEL7 0x07
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/** MUX mask define for the internal 1.1V bandgap channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
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#define ADC_1100MV_BANDGAP 0x1E
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#if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
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/** MUX mask define for the ADC8 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL8 0x20
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/** MUX mask define for the ADC9 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL9 0x21
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/** MUX mask define for the ADC10 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL10 0x22
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/** MUX mask define for the ADC11 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL11 0x23
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/** MUX mask define for the ADC12 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL12 0x24
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/** MUX mask define for the ADC13 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_CHANNEL13 0x25
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/** MUX mask define for the internal temperature sensor channel of the ADC. See \ref ADC_StartReading and
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* \ref ADC_GetChannelReading.
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*
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* \note Note available on all AVR models.
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*/
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#define ADC_INT_TEMP_SENS 0x27
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#endif
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//@}
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/* Pseudo-Function Macros: */
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#if defined(__DOXYGEN__)
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/** Initializes the ADC, ready for conversions. This must be called before any other ADC operations.
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* The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and
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* prescaler masks.
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*
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* \param[in] Mode Mask of ADC settings, including adjustment, prescale, mode and reference
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*/
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static inline void ADC_Init(uint8_t Mode);
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/** Turns off the ADC. If this is called, any further ADC operations will require a call to
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* \ref ADC_Init() before the ADC can be used again.
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*/
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static inline void ADC_ShutDown(void);
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/** Indicates if the ADC is currently enabled.
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*
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* \return Boolean true if the ADC subsystem is currently enabled, false otherwise.
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*/
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static inline bool ADC_GetStatus(void);
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/** Indicates if the current ADC conversion is completed, or still in progress.
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*
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* \return Boolean false if the reading is still taking place, or true if the conversion is
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* complete and ready to be read out with \ref ADC_GetResult()
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*/
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static inline bool ADC_IsReadingComplete(void);
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/** Retrieves the conversion value of the last completed ADC conversion.
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*
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* \return The result of the last ADC conversion
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*/
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static inline uint16_t ADC_GetResult(void);
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#else
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#define ADC_Init(mode) MACROS{ ADCSRA = ((1 << ADEN) | mode); }MACROE
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#define ADC_ShutDown() MACROS{ ADCSRA = 0; }MACROE
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#define ADC_GetStatus() ((ADCSRA & (1 << ADEN)) ? true : false)
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#define ADC_IsReadingComplete() (ADCSRA & (1 << ADSC))
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#define ADC_GetResult() ADC
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#endif
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/* Inline Functions: */
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/** Configures the given ADC channel, ready for ADC conversions. This function sets the
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* associated port pin as an input and disables the digital portion of the I/O to reduce
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* power consumption.
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*
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* \note This must only be called for ADC channels with are connected to a physical port
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* pin of the AVR, denoted by its special alternative function ADCx.
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*
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* \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
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*
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* \param[in] Channel ADC channel number to set up for conversions
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*/
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static inline void ADC_SetupChannel(const uint8_t Channel)
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{
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#if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
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defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
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defined(__AVR_ATmega32U6__))
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DDRF &= ~(1 << Channel);
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DIDR0 |= (1 << Channel);
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#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
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if (Channel < 8)
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{
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DDRF &= ~(1 << Channel);
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DIDR0 |= (1 << Channel);
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}
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else if (Channel == 8)
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{
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DDRD &= ~(1 << 4);
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DIDR2 |= (1 << 0);
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}
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else if (Channel < 11)
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{
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DDRD &= ~(1 << (Channel - 3));
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DIDR2 |= (1 << (Channel - 8));
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}
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else
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{
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DDRB &= ~(1 << (Channel - 7));
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DIDR2 |= (1 << (Channel - 8));
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}
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#endif
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}
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/** Starts the reading of the given channel, but does not wait until the conversion has completed.
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* Once executed, the conversion status can be determined via the \ref ADC_IsReadingComplete() macro and
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* the result read via the \ref ADC_GetResult() macro.
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*
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* \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask
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*/
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static inline void ADC_StartReading(const uint8_t MUXMask)
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{
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ADMUX = MUXMask;
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ADCSRA |= (1 << ADSC);
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}
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/** Performs a complete single reading from channel, including a polling spin-loop to wait for the
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* conversion to complete, and the returning of the converted value.
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*
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* \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask
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*/
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static inline uint16_t ADC_GetChannelReading(const uint8_t MUXMask) ATTR_WARN_UNUSED_RESULT;
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static inline uint16_t ADC_GetChannelReading(const uint8_t MUXMask)
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{
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ADC_StartReading(MUXMask);
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while (!(ADC_IsReadingComplete()));
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return ADC_GetResult();
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}
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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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/** @} */
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