LUFA/Drivers/Peripheral/AVRU4U6U7/ADC.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *  \brief ADC peripheral driver for the U7, U6 and U4 USB AVRs.
  33  *
  34  *  ADC driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
  35  *
  36  *  \note This file should not be included directly. It is automatically included as needed by the ADC driver
  37  *        dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
  38  */
  39
  40 /** \ingroup Group_ADC
  41  *  @defgroup Group_ADC_AVRU4U6U7 Series U4, U6 and U7 Model ADC Driver
  42  *
  43  *  ADC driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
  44  *
  45  *  \note This file should not be included directly. It is automatically included as needed by the ADC driver
  46  *        dispatch header located in LUFA/Drivers/Peripheral/ADC.h.
  47  *
  48  *  @{
  49  */
  50
  51 #ifndef __ADC_AVRU4U6U7_H__
  52 #define __ADC_AVRU4U6U7_H__
  53
  54         /* Includes: */
  55                 #include "../../../Common/Common.h"
  56
  57                 #include <avr/io.h>
  58                 #include <stdbool.h>
  59
  60         /* Enable C linkage for C++ Compilers: */
  61                 #if defined(__cplusplus)
  62                         extern "C" {
  63                 #endif
  64
  65         /* Preprocessor Checks: */
  66                 #if !defined(__INCLUDE_FROM_ADC_H)
  67                         #error Do not include this file directly. Include LUFA/Drivers/Peripheral/ADC.h instead.
  68                 #endif
  69
  70         /* Public Interface - May be used in end-application: */
  71                 /* Macros: */
  72                         /** Reference mask, for using the voltage present at the AVR's AREF pin for the ADC reference. */
  73                         #define ADC_REFERENCE_AREF              0
  74
  75                         /** Reference mask, for using the voltage present at the AVR's AVCC pin for the ADC reference. */
  76                         #define ADC_REFERENCE_AVCC              (1 << REFS0)
  77
  78                         /** Reference mask, for using the internally generated 2.56V reference voltage as the ADC reference. */
  79                         #define ADC_REFERENCE_INT2560MV         ((1 << REFS1) | (1 << REFS0))
  80
  81                         /** Left-adjusts the 10-bit ADC result, so that the upper 8 bits of the value returned by the
  82                          *  ADC_GetResult() macro contain the 8 most significant bits of the result. */
  83                         #define ADC_LEFT_ADJUSTED               (1 << ADLAR)
  84
  85                         /** Right-adjusts the 10-bit ADC result, so that the lower 8 bits of the value returned by the
  86                          *  ADC_GetResult() macro contain the 8 least significant bits of the result. */
  87                         #define ADC_RIGHT_ADJUSTED              (0 << ADLAR)
  88
  89                         /** Sets the ADC mode to free running, so that conversions take place continuously as fast as the ADC
  90                          *  is capable of at the given input clock speed. */
  91                         #define ADC_FREE_RUNNING                (1 << ADATE)
  92
  93                         /** Sets the ADC mode to single conversion, so that only a single conversion will take place before
  94                          *  the ADC returns to idle. */
  95                         #define ADC_SINGLE_CONVERSION           (0 << ADATE)
  96
  97                         /** Sets the ADC input clock to prescale by a factor of 2 the AVR's system clock. */
  98                         #define ADC_PRESCALE_2                  (1 << ADPS0)
  99
 100                         /** Sets the ADC input clock to prescale by a factor of 4 the AVR's system clock. */
 101                         #define ADC_PRESCALE_4                  (1 << ADPS1)
 102
 103                         /** Sets the ADC input clock to prescale by a factor of 8 the AVR's system clock. */
 104                         #define ADC_PRESCALE_8                  ((1 << ADPS0) | (1 << ADPS1))
 105
 106                         /** Sets the ADC input clock to prescale by a factor of 16 the AVR's system clock. */
 107                         #define ADC_PRESCALE_16                 (1 << ADPS2)
 108
 109                         /** Sets the ADC input clock to prescale by a factor of 32 the AVR's system clock. */
 110                         #define ADC_PRESCALE_32                 ((1 << ADPS2) | (1 << ADPS0))
 111
 112                         /** Sets the ADC input clock to prescale by a factor of 64 the AVR's system clock. */
 113                         #define ADC_PRESCALE_64                 ((1 << ADPS2) | (1 << ADPS1))
 114
 115                         /** Sets the ADC input clock to prescale by a factor of 128 the AVR's system clock. */
 116                         #define ADC_PRESCALE_128                ((1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0))
 117
 118                         //@{
 119                         /** MUX mask define for the ADC0 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 120                         #define ADC_CHANNEL0                    (0x00 << MUX0)
 121
 122                         /** MUX mask define for the ADC1 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 123                         #define ADC_CHANNEL1                    (0x01 << MUX0)
 124
 125                         #if !(defined(__AVR_ATmega16U4__)  || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
 126                                 /** MUX mask define for the ADC2 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 127                                  *
 128                                  *  \note Not available on all AVR models.
 129                                  */
 130                                 #define ADC_CHANNEL2                (0x02 << MUX0)
 131
 132                                 /** MUX mask define for the ADC3 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 133                                  *
 134                                  *  \note Not available on all AVR models.
 135                                  */
 136                                 #define ADC_CHANNEL3                (0x03 << MUX0)
 137                         #endif
 138
 139                         /** MUX mask define for the ADC4 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 140                         #define ADC_CHANNEL4                    (0x04 << MUX0)
 141
 142                         /** MUX mask define for the ADC5 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 143                         #define ADC_CHANNEL5                    (0x05 << MUX0)
 144
 145                         /** MUX mask define for the ADC6 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 146                         #define ADC_CHANNEL6                    (0x06 << MUX0)
 147
 148                         /** MUX mask define for the ADC7 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 149                         #define ADC_CHANNEL7                    (0x07 << MUX0)
 150
 151                         /** MUX mask define for the internal 1.1V bandgap channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading. */
 152                         #define ADC_1100MV_BANDGAP              (0x1E << MUX0)
 153
 154                         #if (defined(__AVR_ATmega16U4__)  || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
 155                                 /** MUX mask define for the ADC8 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 156                                  *
 157                                  *  \note Not available on all AVR models.
 158                                  */
 159                                 #define ADC_CHANNEL8                ((1 << 8) | (0x00 << MUX0))
 160
 161                                 /** MUX mask define for the ADC9 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 162                                  *
 163                                  *  \note Not available on all AVR models.
 164                                  */
 165                                 #define ADC_CHANNEL9                ((1 << 8) | (0x01 << MUX0))
 166
 167                                 /** MUX mask define for the ADC10 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 168                                  *
 169                                  *  \note Not available on all AVR models.
 170                                  */
 171                                 #define ADC_CHANNEL10               ((1 << 8) | (0x02 << MUX0))
 172
 173                                 /** MUX mask define for the ADC11 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 174                                  *
 175                                  *  \note Not available on all AVR models.
 176                                  */
 177                                 #define ADC_CHANNEL11               ((1 << 8) | (0x03 << MUX0))
 178
 179                                 /** MUX mask define for the ADC12 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 180                                  *
 181                                  *  \note Not available on all AVR models.
 182                                  */
 183                                 #define ADC_CHANNEL12               ((1 << 8) | (0x04 << MUX0))
 184
 185                                 /** MUX mask define for the ADC13 channel of the ADC. See \ref ADC_StartReading and \ref ADC_GetChannelReading.
 186                                  *
 187                                  *  \note Not available on all AVR models.
 188                                  */
 189                                 #define ADC_CHANNEL13               ((1 << 8) | (0x05 << MUX0))
 190
 191                                 /** MUX mask define for the internal temperature sensor channel of the ADC. See \ref ADC_StartReading and
 192                                  *  \ref ADC_GetChannelReading.
 193                                  *
 194                                  *  \note Not available on all AVR models.
 195                                  */
 196                                 #define ADC_INT_TEMP_SENS           ((1 << 8) | (0x07 << MUX0))
 197                         #endif
 198                         //@}
 199
 200                 /* Inline Functions: */
 201                         /** Configures the given ADC channel, ready for ADC conversions. This function sets the
 202                          *  associated port pin as an input and disables the digital portion of the I/O to reduce
 203                          *  power consumption.
 204                          *
 205                          *  \note This must only be called for ADC channels with are connected to a physical port
 206                          *        pin of the AVR, denoted by its special alternative function ADCx.
 207                          *        \n\n
 208                          *
 209                          *  \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
 210                          *
 211                          *  \param[in] Channel  ADC channel number to set up for conversions.
 212                          */
 213                         static inline void ADC_SetupChannel(const uint8_t Channel)
 214                         {
 215                                 #if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
 216                                          defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
 217                                          defined(__AVR_ATmega32U6__))
 218                                 DDRF  &= ~(1 << Channel);
 219                                 DIDR0 |=  (1 << Channel);
 220                                 #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 221                                 if (Channel < 8)
 222                                 {
 223                                         DDRF  &= ~(1 << Channel);
 224                                         DIDR0 |=  (1 << Channel);
 225                                 }
 226                                 else if (Channel == 8)
 227                                 {
 228                                         DDRD  &= ~(1 << 4);
 229                                         DIDR2 |=  (1 << 0);
 230                                 }
 231                                 else if (Channel < 11)
 232                                 {
 233                                         DDRD  &= ~(1 << (Channel - 3));
 234                                         DIDR2 |=  (1 << (Channel - 8));
 235                                 }
 236                                 else
 237                                 {
 238                                         DDRB  &= ~(1 << (Channel - 7));
 239                                         DIDR2 |=  (1 << (Channel - 8));
 240                                 }
 241                                 #endif
 242                         }
 243
 244                         /** De-configures the given ADC channel, re-enabling digital I/O mode instead of analog. This
 245                          *  function sets the associated port pin as an input and re-enabled the digital portion of
 246                          *  the I/O.
 247                          *
 248                          *  \note This must only be called for ADC channels with are connected to a physical port
 249                          *        pin of the AVR, denoted by its special alternative function ADCx.
 250                          *        \n\n
 251                          *
 252                          *  \note The channel number must be specified as an integer, and NOT a ADC_CHANNELx mask.
 253                          *
 254                          *  \param[in] Channel  ADC channel number to set up for conversions.
 255                          */
 256                         static inline void ADC_DisableChannel(const uint8_t Channel)
 257                         {
 258                                 #if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
 259                                          defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
 260                                          defined(__AVR_ATmega32U6__))
 261                                 DDRF  &= ~(1 << Channel);
 262                                 DIDR0 &= ~(1 << Channel);
 263                                 #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 264                                 if (Channel < 8)
 265                                 {
 266                                         DDRF  &= ~(1 << Channel);
 267                                         DIDR0 &= ~(1 << Channel);
 268                                 }
 269                                 else if (Channel == 8)
 270                                 {
 271                                         DDRD  &= ~(1 << 4);
 272                                         DIDR2 &= ~(1 << 0);
 273                                 }
 274                                 else if (Channel < 11)
 275                                 {
 276                                         DDRD  &= ~(1 << (Channel - 3));
 277                                         DIDR2 &= ~(1 << (Channel - 8));
 278                                 }
 279                                 else
 280                                 {
 281                                         DDRB  &= ~(1 << (Channel - 7));
 282                                         DIDR2 &= ~(1 << (Channel - 8));
 283                                 }
 284                                 #endif
 285                         }
 286
 287                         /** Starts the reading of the given channel, but does not wait until the conversion has completed.
 288                          *  Once executed, the conversion status can be determined via the \ref ADC_IsReadingComplete() macro and
 289                          *  the result read via the \ref ADC_GetResult() macro.
 290                          *
 291                          *  If the ADC has been initialized in free running mode, calling this function once will begin the repeated
 292                          *  conversions. If the ADC is in single conversion mode (or the channel to convert from is to be changed),
 293                          *  this function must be called each time a conversion is to take place.
 294                          *
 295                          *  \param[in] MUXMask  Mask comprising of an ADC channel mask, reference mask and adjustment mask.
 296                          */
 297                         static inline void ADC_StartReading(const uint16_t MUXMask)
 298                         {
 299                                 ADMUX = MUXMask;
 300
 301                                 #if (defined(__AVR_ATmega16U4__)  || defined(__AVR_ATmega32U4__) || defined(__DOXYGEN__))
 302                                 if (MUXMask & (1 << 8))
 303                                   ADCSRB |=  (1 << MUX5);
 304                                 else
 305                                   ADCSRB &= ~(1 << MUX5);
 306                                 #endif
 307
 308                                 ADCSRA |= (1 << ADSC);
 309                         }
 310
 311                         /** Indicates if the current ADC conversion is completed, or still in progress.
 312                          *
 313                          *  \return Boolean false if the reading is still taking place, or true if the conversion is
 314                          *          complete and ready to be read out with \ref ADC_GetResult().
 315                          */
 316                         static inline bool ADC_IsReadingComplete(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 317                         static inline bool ADC_IsReadingComplete(void)
 318                         {
 319                                 return ((ADCSRA & (1 << ADIF)) ? true : false);
 320                         }
 321
 322                         /** Retrieves the conversion value of the last completed ADC conversion and clears the reading
 323                          *  completion flag.
 324                          *
 325                          *  \return The result of the last ADC conversion as an unsigned value.
 326                          */
 327                         static inline uint16_t ADC_GetResult(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 328                         static inline uint16_t ADC_GetResult(void)
 329                         {
 330                                 ADCSRA |= (1 << ADIF);
 331                                 return ADC;
 332                         }
 333
 334                         /** Performs a complete single reading from channel, including a polling spin-loop to wait for the
 335                          *  conversion to complete, and the returning of the converted value.
 336                          *
 337                          *  \note For free running mode, the automated conversions should be initialized with a single call
 338                          *        to \ref ADC_StartReading() to select the channel and begin the automated conversions, and
 339                          *        the results read directly from the \ref ADC_GetResult() instead to reduce overhead.
 340                          *
 341                          *  \param[in] MUXMask  Mask comprising of an ADC channel mask, reference mask and adjustment mask.
 342                          */
 343                         static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask) ATTR_WARN_UNUSED_RESULT;
 344                         static inline uint16_t ADC_GetChannelReading(const uint16_t MUXMask)
 345                         {
 346                                 ADC_StartReading(MUXMask);
 347
 348                                 while (!(ADC_IsReadingComplete()));
 349
 350                                 return ADC_GetResult();
 351                         }
 352
 353                         /** Initialises the ADC, ready for conversions. This must be called before any other ADC operations.
 354                          *  The "mode" parameter should be a mask comprised of a conversion mode (free running or single) and
 355                          *  prescaler masks.
 356                          *
 357                          *  \param[in] Mode  Mask of ADC settings, including adjustment, prescale, mode and reference.
 358                          */
 359                         static inline void ADC_Init(uint8_t Mode) ATTR_ALWAYS_INLINE;
 360                         static inline void ADC_Init(uint8_t Mode)
 361                         {
 362                                 ADCSRA = ((1 << ADEN) | Mode);
 363                         }
 364
 365                         /** Turns off the ADC. If this is called, any further ADC operations will require a call to
 366                          *  \ref ADC_Init() before the ADC can be used again.
 367                          */
 368                         static inline void ADC_ShutDown(void) ATTR_ALWAYS_INLINE;
 369                         static inline void ADC_ShutDown(void)
 370                         {
 371                                 ADCSRA = 0;
 372                         }
 373
 374                         /** Indicates if the ADC is currently enabled.
 375                          *
 376                          *  \return Boolean true if the ADC subsystem is currently enabled, false otherwise.
 377                          */
 378                         static inline bool ADC_GetStatus(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
 379                         static inline bool ADC_GetStatus(void)
 380                         {
 381                                 return ((ADCSRA & (1 << ADEN)) ? true : false);
 382                         }
 383
 384         /* Disable C linkage for C++ Compilers: */
 385                 #if defined(__cplusplus)
 386                         }
 387                 #endif
 388
 389 #endif
 390
 391 /** @} */