/*
LUFA Library
Copyright (C) Dean Camera, 2010.
-
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
/** \file
* \brief ADC peripheral driver for the U7, U6 and U4 USB AVRs.
*
- * ADC driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
+ * On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC
+ * peripheral internally.
*
* \note This file should not be included directly. It is automatically included as needed by the ADC driver
* dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
/** \ingroup Group_ADC
* @defgroup Group_ADC_AVRU4U6U7 Series U4, U6 and U7 Model ADC Driver
*
- * ADC driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
+ * On-chip Analogue-to-Digital converter (ADC) driver for supported U4, U6 and U7 model AVRs that contain an ADC
+ * peripheral internally.
*
* \note This file should not be included directly. It is automatically included as needed by the ADC driver
* dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
*
* @{
*/
-
+
#ifndef __ADC_AVRU4U6U7_H__
#define __ADC_AVRU4U6U7_H__
/* Includes: */
#include "../../../Common/Common.h"
-
+
#include <avr/io.h>
#include <stdbool.h>
-
+
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
extern "C" {
#endif
/* Public Interface - May be used in end-application: */
- /* Macros: */
+ /* Macros: */
+ /** \name ADC Reference Configuration Masks */
+ //@{
/** Reference mask, for using the voltage present at the AVR's AREF pin for the ADC reference. */
- #define ADC_REFERENCE_AREF 0
+ #define ADC_REFERENCE_AREF 0
/** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */
- #define ADC_REFERENCE_AVCC (1 << REFS0)
+ #define ADC_REFERENCE_AVCC (1 << REFS0)
/** Reference mask, for using the internally generated 2.56V reference voltage as the ADC reference. */
- #define ADC_REFERENCE_INT2560MV ((1 << REFS1)| (1 << REFS0))
+ #define ADC_REFERENCE_INT2560MV ((1 << REFS1) | (1 << REFS0))
+ //@}
+ /** \name ADC Result Adjustment Configuration Masks */
+ //@{
/** Left-adjusts the 10-bit ADC result, so that the upper 8 bits of the value returned by the
- * ADC_GetResult() macro contain the 8 most significant bits of the result. */
- #define ADC_LEFT_ADJUSTED (1 << ADLAR)
+ * ADC_GetResult() macro contain the 8 most significant bits of the result.
+ */
+ #define ADC_LEFT_ADJUSTED (1 << ADLAR)
/** Right-adjusts the 10-bit ADC result, so that the lower 8 bits of the value returned by the
- * ADC_GetResult() macro contain the 8 least significant bits of the result. */
- #define ADC_RIGHT_ADJUSTED (0 << ADLAR)
-
+ * ADC_GetResult() macro contain the 8 least significant bits of the result.
+ */
+ #define ADC_RIGHT_ADJUSTED (0 << ADLAR)
+ //@}
+
+ /** \name ADC Mode Configuration Masks */
+ //@{
/** Sets the ADC mode to free running, so that conversions take place continuously as fast as the ADC
- * is capable of at the given input clock speed. */
- #define ADC_FREE_RUNNING (1 << ADATE)
+ * is capable of at the given input clock speed.
+ */
+ #define ADC_FREE_RUNNING (1 << ADATE)
/** Sets the ADC mode to single conversion, so that only a single conversion will take place before
- * the ADC returns to idle. */
- #define ADC_SINGLE_CONVERSION (0 << ADATE)
+ * the ADC returns to idle.
+ */
+ #define ADC_SINGLE_CONVERSION (0 << ADATE)
+ //@}
+ /** \name ADC Prescaler Configuration Masks */
+ //@{
/** Sets the ADC input clock to prescale by a factor of 2 the AVR's system clock. */
- #define ADC_PRESCALE_2 (1 << ADPS0)
+ #define ADC_PRESCALE_2 (1 << ADPS0)
/** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */
- #define ADC_PRESCALE_4 (1 << ADPS1)
+ #define ADC_PRESCALE_4 (1 << ADPS1)
/** Sets the ADC input clock to prescale by a factor of 8 the AVR's system clock. */
- #define ADC_PRESCALE_8 ((1 << ADPS0) | (1 << ADPS1))
+ #define ADC_PRESCALE_8 ((1 << ADPS0) | (1 << ADPS1))
/** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */
- #define ADC_PRESCALE_16 (1 << ADPS2)
+ #define ADC_PRESCALE_16 (1 << ADPS2)
/** Sets the ADC input clock to prescale by a factor of 32 the AVR's system clock. */
- #define ADC_PRESCALE_32 ((1 << ADPS2) | (1 << ADPS0))
+ #define ADC_PRESCALE_32 ((1 << ADPS2) | (1 << ADPS0))
/** Sets the ADC input clock to prescale by a factor of 64 the AVR's system clock. */
- #define ADC_PRESCALE_64 ((1 << ADPS2) | (1 << ADPS1))
+ #define ADC_PRESCALE_64 ((1 << ADPS2) | (1 << ADPS1))
/** Sets the ADC input clock to prescale by a factor of 128 the AVR's system clock. */
- #define ADC_PRESCALE_128 ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0))
-
+ #define ADC_PRESCALE_128 ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0))
+ //@}
+
+ /** \name ADC MUX Masks */
//@{
/** MUX mask define for the ADC0 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL0 (0x00 << MUX0)
+ #define ADC_CHANNEL0 (0x00 << MUX0)
/** MUX mask define for the ADC1 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL1 (0x01 << MUX0)
+ #define ADC_CHANNEL1 (0x01 << MUX0)
#if !(defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
/** MUX mask define for the ADC2 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL2 (0x02 << MUX0)
+ #define ADC_CHANNEL2 (0x02 << MUX0)
/** MUX mask define for the ADC3 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL3 (0x03 << MUX0)
+ #define ADC_CHANNEL3 (0x03 << MUX0)
#endif
/** MUX mask define for the ADC4 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL4 (0x04 << MUX0)
+ #define ADC_CHANNEL4 (0x04 << MUX0)
/** MUX mask define for the ADC5 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL5 (0x05 << MUX0)
+ #define ADC_CHANNEL5 (0x05 << MUX0)
/** MUX mask define for the ADC6 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL6 (0x06 << MUX0)
+ #define ADC_CHANNEL6 (0x06 << MUX0)
/** MUX mask define for the ADC7 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_CHANNEL7 (0x07 << MUX0)
+ #define ADC_CHANNEL7 (0x07 << MUX0)
/** MUX mask define for the internal 1.1V bandgap channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
- #define ADC_1100MV_BANDGAP (0x1E << MUX0)
-
+ #define ADC_1100MV_BANDGAP (0x1E << MUX0)
+
#if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
/** MUX mask define for the ADC8 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL8 ((1 << 8) | (0x00 << MUX0))
+ #define ADC_CHANNEL8 ((1 << 8) | (0x00 << MUX0))
/** MUX mask define for the ADC9 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL9 ((1 << 8) | (0x01 << MUX0))
+ #define ADC_CHANNEL9 ((1 << 8) | (0x01 << MUX0))
/** MUX mask define for the ADC10 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL10 ((1 << 8) | (0x02 << MUX0))
+ #define ADC_CHANNEL10 ((1 << 8) | (0x02 << MUX0))
/** MUX mask define for the ADC11 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL11 ((1 << 8) | (0x03 << MUX0))
+ #define ADC_CHANNEL11 ((1 << 8) | (0x03 << MUX0))
/** MUX mask define for the ADC12 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL12 ((1 << 8) | (0x04 << MUX0))
+ #define ADC_CHANNEL12 ((1 << 8) | (0x04 << MUX0))
/** MUX mask define for the ADC13 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_CHANNEL13 ((1 << 8) | (0x05 << MUX0))
+ #define ADC_CHANNEL13 ((1 << 8) | (0x05 << MUX0))
/** MUX mask define for the internal temperature sensor channel of the ADC. See \ref ADC_StartReading and
* \ref ADC_GetChannelReading.
*
* \note Not available on all AVR models.
*/
- #define ADC_INT_TEMP_SENS ((1 << 8) | (0x07 << MUX0))
+ #define ADC_INT_TEMP_SENS ((1 << 8) | (0x07 << MUX0))
#endif
//@}
-
- /* Pseudo-Function Macros: */
- #if defined(__DOXYGEN__)
- /** Initializes the ADC, ready for conversions. This must be called before any other ADC operations.
- * The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and
- * prescaler masks.
- *
- * \param[in] Mode Mask of ADC settings, including adjustment, prescale, mode and reference
- */
- static inline void ADC_Init(uint8_t Mode);
- /** Turns off the ADC. If this is called, any further ADC operations will require a call to
- * \ref ADC_Init() before the ADC can be used again.
- */
- static inline void ADC_ShutDown(void);
-
- /** Indicates if the ADC is currently enabled.
- *
- * \return Boolean true if the ADC subsystem is currently enabled, false otherwise.
- */
- static inline bool ADC_GetStatus(void);
-
- /** Indicates if the current ADC conversion is completed, or still in progress.
- *
- * \return Boolean false if the reading is still taking place, or true if the conversion is
- * complete and ready to be read out with \ref ADC_GetResult()
- */
- static inline bool ADC_IsReadingComplete(void);
-
- /** Retrieves the conversion value of the last completed ADC conversion and clears the reading
- * completion flag.
- *
- * \return The result of the last ADC conversion
- */
- static inline uint16_t ADC_GetResult(void);
- #else
- #define ADC_Init(mode) MACROS{ ADCSRA = ((1 << ADEN) | mode); }MACROE
-
- #define ADC_ShutDown() MACROS{ ADCSRA = 0; }MACROE
-
- #define ADC_GetStatus() ((ADCSRA & (1 << ADEN)) ? true : false)
-
- #define ADC_IsReadingComplete() ((ADCSRA & (1 << ADIF)) ? true : false)
-
- #define ADC_GetResult() (ADCSRA |= (1 << ADIF), ADC)
- #endif
-
/* Inline Functions: */
/** Configures the given ADC channel, ready for ADC conversions. This function sets the
* associated port pin as an input and disables the digital portion of the I/O to reduce
*
* \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
*
- * \param[in] Channel ADC channel number to set up for conversions
+ * \param[in] ChannelIndex ADC channel number to set up for conversions.
*/
- static inline void ADC_SetupChannel(const uint8_t Channel)
+ static inline void ADC_SetupChannel(const uint8_t ChannelIndex)
{
#if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
- defined(__AVR_ATmega32U6__))
- DDRF &= ~(1 << Channel);
- DIDR0 |= (1 << Channel);
+ defined(__AVR_ATmega32U6__))
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 |= (1 << ChannelIndex);
#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
- if (Channel < 8)
+ if (ChannelIndex < 8)
{
- DDRF &= ~(1 << Channel);
- DIDR0 |= (1 << Channel);
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 |= (1 << ChannelIndex);
}
- else if (Channel == 8)
+ else if (ChannelIndex == 8)
{
DDRD &= ~(1 << 4);
DIDR2 |= (1 << 0);
}
- else if (Channel < 11)
+ else if (ChannelIndex < 11)
{
- DDRD &= ~(1 << (Channel - 3));
- DIDR2 |= (1 << (Channel - 8));
+ DDRD &= ~(1 << (ChannelIndex - 3));
+ DIDR2 |= (1 << (ChannelIndex - 8));
}
else
{
- DDRB &= ~(1 << (Channel - 7));
- DIDR2 |= (1 << (Channel - 8));
+ DDRB &= ~(1 << (ChannelIndex - 7));
+ DIDR2 |= (1 << (ChannelIndex - 8));
}
#endif
}
-
+
/** De-configures the given ADC channel, re-enabling digital I/O mode instead of analog. This
* function sets the associated port pin as an input and re-enabled the digital portion of
* the I/O.
*
* \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
*
- * \param[in] Channel ADC channel number to set up for conversions
+ * \param[in] ChannelIndex ADC channel number to set up for conversions.
*/
- static inline void ADC_DisableChannel(const uint8_t Channel)
+ static inline void ADC_DisableChannel(const uint8_t ChannelIndex)
{
#if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
- defined(__AVR_ATmega32U6__))
- DDRF &= ~(1 << Channel);
- DIDR0 &= ~(1 << Channel);
+ defined(__AVR_ATmega32U6__))
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 &= ~(1 << ChannelIndex);
#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
- if (Channel < 8)
+ if (ChannelIndex < 8)
{
- DDRF &= ~(1 << Channel);
- DIDR0 &= ~(1 << Channel);
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 &= ~(1 << ChannelIndex);
}
- else if (Channel == 8)
+ else if (ChannelIndex == 8)
{
DDRD &= ~(1 << 4);
DIDR2 &= ~(1 << 0);
}
- else if (Channel < 11)
+ else if (ChannelIndex < 11)
{
- DDRD &= ~(1 << (Channel - 3));
- DIDR2 &= ~(1 << (Channel - 8));
+ DDRD &= ~(1 << (ChannelIndex - 3));
+ DIDR2 &= ~(1 << (ChannelIndex - 8));
}
else
{
- DDRB &= ~(1 << (Channel - 7));
- DIDR2 &= ~(1 << (Channel - 8));
+ DDRB &= ~(1 << (ChannelIndex - 7));
+ DIDR2 &= ~(1 << (ChannelIndex - 8));
}
#endif
}
* conversions. If the ADC is in single conversion mode (or the channel to convert from is to be changed),
* this function must be called each time a conversion is to take place.
*
- * \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask
+ * \param[in] MUXMask ADC channel mask, reference mask and adjustment mask.
*/
static inline void ADC_StartReading(const uint16_t MUXMask)
{
ADMUX = MUXMask;
-
+
#if (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
if (MUXMask & (1 << 8))
ADCSRB |= (1 << MUX5);
else
ADCSRB &= ~(1 << MUX5);
#endif
-
+
ADCSRA |= (1 << ADSC);
}
+ /** Indicates if the current ADC conversion is completed, or still in progress.
+ *
+ * \return Boolean false if the reading is still taking place, or true if the conversion is
+ * complete and ready to be read out with \ref ADC_GetResult().
+ */
+ static inline bool ADC_IsReadingComplete(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool ADC_IsReadingComplete(void)
+ {
+ return ((ADCSRA & (1 << ADIF)) ? true : false);
+ }
+
+ /** Retrieves the conversion value of the last completed ADC conversion and clears the reading
+ * completion flag.
+ *
+ * \return The result of the last ADC conversion as an unsigned value.
+ */
+ static inline uint16_t ADC_GetResult(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline uint16_t ADC_GetResult(void)
+ {
+ ADCSRA |= (1 << ADIF);
+ return ADC;
+ }
+
/** Performs a complete single reading from channel, including a polling spin-loop to wait for the
* conversion to complete, and the returning of the converted value.
*
* to \ref ADC_StartReading() to select the channel and begin the automated conversions, and
* the results read directly from the \ref ADC_GetResult() instead to reduce overhead.
*
- * \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask
+ * \param[in] MUXMask Mask comprising of an ADC channel mask, reference mask and adjustment mask.
*/
static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask) ATTR_WARN_UNUSED_RESULT;
static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask)
{
ADC_StartReading(MUXMask);
-
+
while (!(ADC_IsReadingComplete()));
-
+
return ADC_GetResult();
}
+ /** Initialises the ADC, ready for conversions. This must be called before any other ADC operations.
+ * The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and
+ * prescaler masks.
+ *
+ * \param[in] Mode Mask of ADC prescale and mode settings.
+ */
+ static inline void ADC_Init(uint8_t Mode) ATTR_ALWAYS_INLINE;
+ static inline void ADC_Init(uint8_t Mode)
+ {
+ ADCSRA = ((1 << ADEN) | Mode);
+ }
+
+ /** Turns off the ADC. If this is called, any further ADC operations will require a call to
+ * \ref ADC_Init() before the ADC can be used again.
+ */
+ static inline void ADC_ShutDown(void) ATTR_ALWAYS_INLINE;
+ static inline void ADC_ShutDown(void)
+ {
+ ADCSRA = 0;
+ }
+
+ /** Indicates if the ADC is currently enabled.
+ *
+ * \return Boolean true if the ADC subsystem is currently enabled, false otherwise.
+ */
+ static inline bool ADC_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool ADC_GetStatus(void)
+ {
+ return ((ADCSRA & (1 << ADEN)) ? true : false);
+ }
+
/* Disable C linkage for C++ Compilers: */
#if defined(__cplusplus)
}
#endif
-
+
#endif
/** @} */
+
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