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Diffstat (limited to 'LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h')
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h b/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h new file mode 100644 index 0000000..9a72cd2 --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h @@ -0,0 +1,411 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ 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
+ 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
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ * \brief ADC peripheral driver for the U7, U6 and U4 USB 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
+ *
+ * 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
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_ADC_H)
+ #error Do not include this file directly. Include LUFA/Drivers/Peripheral/ADC.h instead.
+ #endif
+
+ /* Public Interface - May be used in end-application: */
+ /* 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
+
+ /** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */
+ #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))
+ //@}
+
+ /** \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)
+
+ /** 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)
+ //@}
+
+ /** \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)
+
+ /** 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)
+ //@}
+
+ /** \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)
+
+ /** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */
+ #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))
+
+ /** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */
+ #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))
+
+ /** 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))
+
+ /** 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))
+ //@}
+
+ /** \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)
+
+ /** MUX mask define for the ADC1 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
+ #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)
+
+ /** 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)
+ #endif
+
+ /** MUX mask define for the ADC4 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
+ #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)
+
+ /** MUX mask define for the ADC6 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
+ #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)
+
+ /** 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)
+
+ #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))
+
+ /** 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))
+
+ /** 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))
+
+ /** 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))
+
+ /** 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))
+
+ /** 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))
+
+ /** 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))
+ #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
+ * power consumption.
+ *
+ * \note This must only be called for ADC channels with are connected to a physical port
+ * pin of the AVR, denoted by its special alternative function ADCx.
+ * \n\n
+ *
+ * \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
+ *
+ * \param[in] ChannelIndex ADC channel number to set up for conversions.
+ */
+ 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 << ChannelIndex);
+ DIDR0 |= (1 << ChannelIndex);
+ #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+ if (ChannelIndex < 8)
+ {
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 |= (1 << ChannelIndex);
+ }
+ else if (ChannelIndex == 8)
+ {
+ DDRD &= ~(1 << 4);
+ DIDR2 |= (1 << 0);
+ }
+ else if (ChannelIndex < 11)
+ {
+ DDRD &= ~(1 << (ChannelIndex - 3));
+ DIDR2 |= (1 << (ChannelIndex - 8));
+ }
+ else
+ {
+ 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 This must only be called for ADC channels with are connected to a physical port
+ * pin of the AVR, denoted by its special alternative function ADCx.
+ * \n\n
+ *
+ * \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
+ *
+ * \param[in] ChannelIndex ADC channel number to set up for conversions.
+ */
+ 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 << ChannelIndex);
+ DIDR0 &= ~(1 << ChannelIndex);
+ #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+ if (ChannelIndex < 8)
+ {
+ DDRF &= ~(1 << ChannelIndex);
+ DIDR0 &= ~(1 << ChannelIndex);
+ }
+ else if (ChannelIndex == 8)
+ {
+ DDRD &= ~(1 << 4);
+ DIDR2 &= ~(1 << 0);
+ }
+ else if (ChannelIndex < 11)
+ {
+ DDRD &= ~(1 << (ChannelIndex - 3));
+ DIDR2 &= ~(1 << (ChannelIndex - 8));
+ }
+ else
+ {
+ DDRB &= ~(1 << (ChannelIndex - 7));
+ DIDR2 &= ~(1 << (ChannelIndex - 8));
+ }
+ #endif
+ }
+
+ /** Starts the reading of the given channel, but does not wait until the conversion has completed.
+ * Once executed, the conversion status can be determined via the \ref ADC_IsReadingComplete() macro and
+ * the result read via the \ref ADC_GetResult() macro.
+ *
+ * If the ADC has been initialized in free running mode, calling this function once will begin the repeated
+ * 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 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.
+ *
+ * \note For free running mode, the automated conversions should be initialized with a single call
+ * 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.
+ */
+ 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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