Rename Drivers/AT90USBXXX to Drivers/Peripheral.
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Dean Camera
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LUFA/Drivers/Peripheral/AT90USBXXX67/ADC.h
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LUFA/Drivers/Peripheral/AT90USBXXX67/ADC.h
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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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 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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 AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
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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_AT90USBXXX67 AT90USBXXX6 and AT90USBXXX7 Models
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*
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* @{
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*/
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#ifndef __ADC_AT90USBXXX67_H__
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#define __ADC_AT90USBXXX67_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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/** 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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#define ADC_Init(mode) MACROS{ ADCSRA = ((1 << ADEN) | mode); }MACROE
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/** Turns off the ADC. If this is called, any further ADC operations will require a call to the
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* ADC_Init() macro before the ADC can be used again.
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*/
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#define ADC_Off() MACROS{ ADCSRA = 0; }MACROE
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/** Indicates if the ADC is enabled. This macro will return boolean true if the ADC subsystem is
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* currently enabled, or false otherwise.
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*/
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#define ADC_GetStatus() ((ADCSRA & (1 << ADEN)) ? true : false)
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/** Indicates if the current ADC conversion is completed, or still in progress. This returns boolean
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* false if the reading is still taking place, or true if the conversion is complete and ready to be
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* read out with ADC_GetResult().
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*/
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#define ADC_IsReadingComplete() (!(ADCSRA & (1 << ADSC)))
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/** Returns the result of the last conversion, as a 16-bit wide integer. */
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#define ADC_GetResult() ADC
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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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/* 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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* \param 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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DDRF &= ~(1 << Channel);
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DIDR0 |= (1 << Channel);
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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 ADC_IsReadingComplete() macro and
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* the result read via the ADC_GetResult() macro.
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*
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* \param MUXMask Mask comprising of an ADC channel number, 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 spinloop 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 MUXMask Mask comprising of an ADC channel number, 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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