446 lines
17 KiB
C
446 lines
17 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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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 2017 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 disclaims 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 ADC Peripheral Driver (AVR8)
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*
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* On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC
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* peripheral internally.
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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 ADC Peripheral Driver (AVR8)
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*
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* \section Sec_ADC_AVR8_ModDescription Module Description
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* On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC
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* peripheral internally.
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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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* \section Sec_ADC_AVR8_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 driver before first use
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* ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
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*
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* // Must setup the ADC channel to read beforehand
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* ADC_SetupChannel(1);
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*
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* // Perform a single conversion of the ADC channel 1
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* ADC_GetChannelReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_CHANNEL1);
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* printf("Conversion Result: %d\r\n", ADC_GetResult());
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*
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* // Start reading ADC channel 1 in free running (continuous conversion) mode
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* ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_CHANNEL1);
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* for (;;)
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* {
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* while (!(ADC_IsReadingComplete())) {};
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* printf("Conversion Result: %d\r\n", ADC_GetResult());
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* }
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* \endcode
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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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/* 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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#if !(defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
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defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
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defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
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#error The ADC peripheral driver is not currently available for your selected microcontroller model.
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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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/** \name ADC Reference Configuration Masks */
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//@{
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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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//@}
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/** \name ADC Result Adjustment Configuration Masks */
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//@{
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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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* \ref ADC_GetResult() macro contain the 8 most significant bits of the result.
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*/
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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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* \ref ADC_GetResult() macro contain the 8 least significant bits of the result.
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*/
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#define ADC_RIGHT_ADJUSTED (0 << ADLAR)
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//@}
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/** \name ADC Mode Configuration Masks */
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//@{
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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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*/
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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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*/
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#define ADC_SINGLE_CONVERSION (0 << ADATE)
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//@}
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/** \name ADC Prescaler Configuration Masks */
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//@{
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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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/** \name ADC MUX Masks */
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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 << MUX0)
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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 << MUX0)
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL2 (0x02 << MUX0)
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL3 (0x03 << MUX0)
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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 << MUX0)
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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 << MUX0)
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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 << MUX0)
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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 << MUX0)
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL8 ((1 << 8) | (0x00 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL9 ((1 << 8) | (0x01 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL10 ((1 << 8) | (0x02 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL11 ((1 << 8) | (0x03 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL12 ((1 << 8) | (0x04 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_CHANNEL13 ((1 << 8) | (0x05 << MUX0))
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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 Not available on all AVR models.
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*/
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#define ADC_INT_TEMP_SENS ((1 << 8) | (0x07 << MUX0))
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#endif
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/** MUX mask define for the internal 1.1V band-gap channel of the ADC. See \ref ADC_StartReading() and \ref ADC_GetChannelReading(). */
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#define ADC_1100MV_BANDGAP (0x1E << MUX0)
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/** Retrieves the ADC MUX mask for the given ADC channel number.
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*
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* \attention This macro will only work correctly on channel numbers that are compile-time
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* constants defined by the preprocessor.
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*
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* \param[in] Channel Index of the ADC channel whose MUX mask is to be retrieved.
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*/
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#define ADC_GET_CHANNEL_MASK(Channel) CONCAT_EXPANDED(ADC_CHANNEL, Channel)
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//@}
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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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* \warning The channel number must be specified as an integer, and <b>not</b> a \c ADC_CHANNEL* mask.
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*
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* \param[in] ChannelIndex ADC channel number to set up for conversions.
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*/
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static inline void ADC_SetupChannel(const uint8_t ChannelIndex)
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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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DDRF &= ~(1 << ChannelIndex);
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DIDR0 |= (1 << ChannelIndex);
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#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
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if (ChannelIndex < 8)
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{
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DDRF &= ~(1 << ChannelIndex);
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DIDR0 |= (1 << ChannelIndex);
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}
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else if (ChannelIndex == 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 (ChannelIndex < 11)
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{
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DDRD &= ~(1 << (ChannelIndex - 3));
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DIDR2 |= (1 << (ChannelIndex - 8));
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}
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else
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{
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DDRB &= ~(1 << (ChannelIndex - 7));
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DIDR2 |= (1 << (ChannelIndex - 8));
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}
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#endif
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}
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/** De-configures the given ADC channel, re-enabling digital I/O mode instead of analog. This
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* function sets the associated port pin as an input and re-enabled the digital portion of
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* the I/O.
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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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* \warning The channel number must be specified as an integer, and <b>not</b> a \c ADC_CHANNEL* mask.
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*
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* \param[in] ChannelIndex ADC channel number to set up for conversions.
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*/
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static inline void ADC_DisableChannel(const uint8_t ChannelIndex)
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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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DDRF &= ~(1 << ChannelIndex);
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DIDR0 &= ~(1 << ChannelIndex);
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#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
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if (ChannelIndex < 8)
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{
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DDRF &= ~(1 << ChannelIndex);
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DIDR0 &= ~(1 << ChannelIndex);
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}
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else if (ChannelIndex == 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 (ChannelIndex < 11)
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{
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DDRD &= ~(1 << (ChannelIndex - 3));
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DIDR2 &= ~(1 << (ChannelIndex - 8));
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}
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else
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{
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DDRB &= ~(1 << (ChannelIndex - 7));
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DIDR2 &= ~(1 << (ChannelIndex - 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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* If the ADC has been initialized in free running mode, calling this function once will begin the repeated
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* conversions. If the ADC is in single conversion mode (or the channel to convert from is to be changed),
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* this function must be called each time a conversion is to take place.
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*
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* \param[in] MUXMask ADC channel mask, reference mask and adjustment mask.
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*/
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static inline void ADC_StartReading(const uint16_t MUXMask)
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{
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ADMUX = MUXMask;
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#if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
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if (MUXMask & (1 << 8))
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ADCSRB |= (1 << MUX5);
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else
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ADCSRB &= ~(1 << MUX5);
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#endif
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ADCSRA |= (1 << ADSC);
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}
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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 \c 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) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
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static inline bool ADC_IsReadingComplete(void)
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{
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return ((ADCSRA & (1 << ADIF)) ? true : false);
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}
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/** Retrieves the conversion value of the last completed ADC conversion and clears the reading
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* completion flag.
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*
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* \return The result of the last ADC conversion as an unsigned value.
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*/
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static inline uint16_t ADC_GetResult(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
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static inline uint16_t ADC_GetResult(void)
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{
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ADCSRA |= (1 << ADIF);
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return ADC;
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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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* \note For free running mode, the automated conversions should be initialized with a single call
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* to \ref ADC_StartReading() to select the channel and begin the automated conversions, and
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* the results read directly from the \ref ADC_GetResult() instead to reduce overhead.
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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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* \return Converted ADC result for the given ADC channel.
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*/
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static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask) ATTR_WARN_UNUSED_RESULT;
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static inline uint16_t ADC_GetChannelReading(const uint16_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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/** 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 prescale and mode settings.
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*/
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static inline void ADC_Init(const uint8_t Mode) ATTR_ALWAYS_INLINE;
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static inline void ADC_Init(const uint8_t Mode)
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{
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ADCSRA = ((1 << ADEN) | Mode);
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}
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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_Disable(void) ATTR_ALWAYS_INLINE;
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static inline void ADC_Disable(void)
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{
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ADCSRA = 0;
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}
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/** Indicates if the ADC is currently enabled.
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*
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* \return Boolean \c true if the ADC subsystem is currently enabled, \c false otherwise.
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*/
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static inline bool ADC_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
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static inline bool ADC_GetStatus(void)
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{
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return ((ADCSRA & (1 << ADEN)) ? true : false);
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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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