LUFA/Common/Common.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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 Common library convenience headers, macros and functions.
  33  *
  34  *  \copydetails Group_Common
  35  */
  36
  37 /** \defgroup Group_Common Common Utility Headers - LUFA/Drivers/Common/Common.h
  38  *  \brief Common library convenience headers, macros and functions.
  39  *
  40  *  Common utility headers containing macros, functions, enums and types which are common to all
  41  *  aspects of the library.
  42  *
  43  *  @{
  44  */
  45
  46 /** \defgroup Group_Debugging Debugging Macros
  47  *  \brief Convenience macros to aid in debugging applications.
  48  *
  49  *  Macros to aid debugging of a user application.
  50  */
  51
  52 /** \defgroup Group_GlobalInt Global Interrupt Macros
  53  *  \brief Convenience macros for the management of interrupts globally within the device.
  54  *
  55  *  Macros and functions to create and control global interrupts within the device.
  56  */
  57
  58 #ifndef __LUFA_COMMON_H__
  59 #define __LUFA_COMMON_H__
  60
  61         /* Macros: */
  62                 #define __INCLUDE_FROM_COMMON_H
  63
  64         /* Includes: */
  65                 #include <stdint.h>
  66                 #include <stdbool.h>
  67                 #include <string.h>
  68                 #include <stddef.h>
  69
  70                 #if defined(USE_LUFA_CONFIG_HEADER)
  71                         #include "LUFAConfig.h"
  72                 #endif
  73
  74                 #include "CompilerSpecific.h"
  75                 #include "Architectures.h"
  76                 #include "Attributes.h"
  77                 #include "BoardTypes.h"
  78
  79         /* Enable C linkage for C++ Compilers: */
  80                 #if defined(__cplusplus)
  81                         extern "C" {
  82                 #endif
  83
  84         /* Architecture specific utility includes: */
  85                 #if defined(__DOXYGEN__)
  86                         /** Type define for an unsigned integer the same width as the selected architecture's machine register.
  87                          *  This is distinct from the non-specific standard int data type, whose width is machine dependant but
  88                          *  which may not reflect the actual machine register width on some targets (e.g. AVR8).
  89                          */
  90                         typedef MACHINE_REG_t uint_reg_t;
  91                 #elif (ARCH == ARCH_AVR8)
  92                         #include <avr/io.h>
  93                         #include <avr/interrupt.h>
  94                         #include <avr/pgmspace.h>
  95                         #include <avr/eeprom.h>
  96                         #include <avr/boot.h>
  97                         #include <util/delay.h>
  98
  99                         typedef uint8_t uint_reg_t;
 100
 101                         #define ARCH_HAS_EEPROM_ADDRESS_SPACE
 102                         #define ARCH_HAS_FLASH_ADDRESS_SPACE
 103                         #define ARCH_HAS_MULTI_ADDRESS_SPACE
 104                         #define ARCH_LITTLE_ENDIAN
 105
 106                         #include "Endianness.h"
 107                 #elif (ARCH == ARCH_UC3)
 108                         #include <avr32/io.h>
 109
 110                         // === TODO: Find abstracted way to handle these ===
 111                         #define PROGMEM                  const
 112                         #define pgm_read_byte(x)         *x
 113                         #define memcmp_P(...)            memcmp(__VA_ARGS__)
 114                         #define memcpy_P(...)            memcpy(__VA_ARGS__)
 115                         // =================================================
 116
 117                         typedef uint32_t uint_reg_t;
 118
 119                         #define ARCH_BIG_ENDIAN
 120
 121                         #include "Endianness.h"
 122                 #elif (ARCH == ARCH_XMEGA)
 123                         #include <avr/io.h>
 124                         #include <avr/interrupt.h>
 125                         #include <avr/pgmspace.h>
 126                         #include <avr/eeprom.h>
 127                         #include <util/delay.h>
 128
 129                         typedef uint8_t uint_reg_t;
 130
 131                         #define ARCH_HAS_EEPROM_ADDRESS_SPACE
 132                         #define ARCH_HAS_FLASH_ADDRESS_SPACE
 133                         #define ARCH_HAS_MULTI_ADDRESS_SPACE
 134                         #define ARCH_LITTLE_ENDIAN
 135
 136                         #include "Endianness.h"
 137                 #else
 138                         #error Unknown device architecture specified.
 139                 #endif
 140
 141         /* Public Interface - May be used in end-application: */
 142                 /* Macros: */
 143                         /** Macro for encasing other multi-statement macros. This should be used along with an opening brace
 144                          *  before the start of any multi-statement macro, so that the macros contents as a whole are treated
 145                          *  as a discrete block and not as a list of separate statements which may cause problems when used as
 146                          *  a block (such as inline \c if statements).
 147                          */
 148                         #define MACROS                  do
 149
 150                         /** Macro for encasing other multi-statement macros. This should be used along with a preceding closing
 151                          *  brace at the end of any multi-statement macro, so that the macros contents as a whole are treated
 152                          *  as a discrete block and not as a list of separate statements which may cause problems when used as
 153                          *  a block (such as inline \c if statements).
 154                          */
 155                         #define MACROE                  while (0)
 156
 157                         /** Convenience macro to determine the larger of two values.
 158                          *
 159                          *  \note This macro should only be used with operands that do not have side effects from being evaluated
 160                          *        multiple times.
 161                          *
 162                          *  \param[in] x  First value to compare
 163                          *  \param[in] y  First value to compare
 164                          *
 165                          *  \return The larger of the two input parameters
 166                          */
 167                         #if !defined(MAX) || defined(__DOXYGEN__)
 168                                 #define MAX(x, y)               ((x > y) ? x : y)
 169                         #endif
 170
 171                         /** Convenience macro to determine the smaller of two values.
 172                          *
 173                          *  \note This macro should only be used with operands that do not have side effects from being evaluated
 174                          *        multiple times.
 175                          *
 176                          *  \param[in] x  First value to compare
 177                          *  \param[in] y  First value to compare
 178                          *
 179                          *  \return The smaller of the two input parameters
 180                          */
 181                         #if !defined(MIN) || defined(__DOXYGEN__)
 182                                 #define MIN(x, y)               ((x < y) ? x : y)
 183                         #endif
 184
 185                         #if !defined(STRINGIFY) || defined(__DOXYGEN__)
 186                                 /** Converts the given input into a string, via the C Preprocessor. This macro puts literal quotation
 187                                  *  marks around the input, converting the source into a string literal.
 188                                  *
 189                                  *  \param[in] x  Input to convert into a string literal.
 190                                  *
 191                                  *  \return String version of the input.
 192                                  */
 193                                 #define STRINGIFY(x)            #x
 194
 195                                 /** Converts the given input into a string after macro expansion, via the C Preprocessor. This macro puts
 196                                  *  literal quotation marks around the expanded input, converting the source into a string literal.
 197                                  *
 198                                  *  \param[in] x  Input to expand and convert into a string literal.
 199                                  *
 200                                  *  \return String version of the expanded input.
 201                                  */
 202                                 #define STRINGIFY_EXPANDED(x)   STRINGIFY(x)
 203                         #endif
 204
 205                         #if (ARCH == ARCH_AVR8) || defined(__DOXYGEN__)
 206                                 /** Defines a volatile \c NOP statement which cannot be optimized out by the compiler, and thus can always
 207                                  *  be set as a breakpoint in the resulting code. Useful for debugging purposes, where the optimizer
 208                                  *  removes/reorders code to the point where break points cannot reliably be set.
 209                                  *
 210                                  *  \note This macro is not available for all architectures.
 211                                  *
 212                                  *  \ingroup Group_Debugging
 213                                  */
 214                                 #define JTAG_DEBUG_POINT()      __asm__ __volatile__ ("NOP" ::)
 215
 216                                 /** Defines an explicit JTAG break point in the resulting binary via the assembly \c BREAK statement. When
 217                                  *  a JTAG is used, this causes the program execution to halt when reached until manually resumed.
 218                                  *
 219                                  *  \note This macro is not available for all architectures.
 220                                  *
 221                                  *  \ingroup Group_Debugging
 222                                  */
 223                                 #define JTAG_DEBUG_BREAK()      __asm__ __volatile__ ("BREAK" ::)
 224
 225                                 /** Macro for testing condition "x" and breaking via \ref JTAG_DEBUG_BREAK() if the condition is false.
 226                                  *
 227                                  *  \note This macro is not available for all architectures.
 228                                  *
 229                                  *  \param[in] Condition  Condition that will be evaluated.
 230                                  *
 231                                  *  \ingroup Group_Debugging
 232                                 */
 233                                 #define JTAG_DEBUG_ASSERT(Condition)    MACROS{ if (!(Condition)) { JTAG_DEBUG_BREAK(); } }MACROE
 234
 235                                 /** Macro for testing condition "x" and writing debug data to the stdout stream if \c false. The stdout stream
 236                                  *  must be pre-initialized before this macro is run and linked to an output device, such as the microcontroller's
 237                                  *  USART peripheral.
 238                                  *
 239                                  *  The output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion {Condition} failed."
 240                                  *
 241                                  *  \note This macro is not available for all architectures.
 242                                  *
 243                                  *  \param[in] Condition  Condition that will be evaluated,
 244                                  *
 245                                  *  \ingroup Group_Debugging
 246                                  */
 247                                 #define STDOUT_ASSERT(Condition)        MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: "   \
 248                                                                                 "Assertion \"%s\" failed.\r\n"),     \
 249                                                                                 __FILE__, __func__, __LINE__, #Condition); } }MACROE
 250
 251                                 #if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
 252                                         /** Reads a pointer out of PROGMEM space on the AVR8 architecture. This is currently a wrapper for the
 253                                          *  avr-libc \c pgm_read_ptr() macro with a \c void* cast, so that its value can be assigned directly
 254                                          *  to a pointer variable or used in pointer arithmetic without further casting in C. In a future
 255                                          *  avr-libc distribution this will be part of the standard API and will be implemented in a more formal
 256                                          *  manner.
 257                                          *
 258                                          *  \note This macro is not available for all architectures.
 259                                          *
 260                                          *  \param[in] Address  Address of the pointer to read.
 261                                          *
 262                                          *  \return Pointer retrieved from PROGMEM space.
 263                                          */
 264                                         #define pgm_read_ptr(Address)        (void*)pgm_read_word(Address)
 265                                 #endif
 266                         #endif
 267
 268                         #if !defined(ISR) || defined(__DOXYGEN__)
 269                                 /** Macro for the definition of interrupt service routines, so that the compiler can insert the required
 270                                  *  prologue and epilogue code to properly manage the interrupt routine without affecting the main thread's
 271                                  *  state with unintentional side-effects.
 272                                  *
 273                                  *  Interrupt handlers written using this macro may still need to be registered with the microcontroller's
 274                                  *  Interrupt Controller (if present) before they will properly handle incoming interrupt events.
 275                                  *
 276                                  *  \note This macro is only supplied on some architectures, where the standard library does not include a valid
 277                                  *        definition. If an existing definition exists, the alternative definition here will be ignored.
 278                                  *
 279                                  *  \ingroup Group_GlobalInt
 280                                  *
 281                                  *  \param Name  Unique name of the interrupt service routine.
 282                                  */
 283                                 #define ISR(Name, ...)                  void Name (void) __attribute__((__interrupt__)) __VA_ARGS__; void Name (void)
 284                         #endif
 285
 286                 /* Inline Functions: */
 287                         /** Function to reverse the individual bits in a byte - i.e. bit 7 is moved to bit 0, bit 6 to bit 1,
 288                          *  etc.
 289                          *
 290                          *  \param[in] Byte  Byte of data whose bits are to be reversed.
 291                          */
 292                         static inline uint8_t BitReverse(uint8_t Byte) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
 293                         static inline uint8_t BitReverse(uint8_t Byte)
 294                         {
 295                                 Byte = (((Byte & 0xF0) >> 4) | ((Byte & 0x0F) << 4));
 296                                 Byte = (((Byte & 0xCC) >> 2) | ((Byte & 0x33) << 2));
 297                                 Byte = (((Byte & 0xAA) >> 1) | ((Byte & 0x55) << 1));
 298
 299                                 return Byte;
 300                         }
 301
 302                         /** Function to perform a blocking delay for a specified number of milliseconds. The actual delay will be
 303                          *  at a minimum the specified number of milliseconds, however due to loop overhead and internal calculations
 304                          *  may be slightly higher.
 305                          *
 306                          *  \param[in] Milliseconds  Number of milliseconds to delay
 307                          */
 308                         static inline void Delay_MS(uint8_t Milliseconds) ATTR_ALWAYS_INLINE;
 309                         static inline void Delay_MS(uint8_t Milliseconds)
 310                         {
 311                                 #if (ARCH == ARCH_AVR8)
 312                                 if (GCC_IS_COMPILE_CONST(Milliseconds))
 313                                 {
 314                                         _delay_ms(Milliseconds);
 315                                 }
 316                                 else
 317                                 {
 318                                         while (Milliseconds--)
 319                                           _delay_ms(1);
 320                                 }
 321                                 #elif (ARCH == ARCH_UC3)
 322                                 while (Milliseconds--)
 323                                 {
 324                                         __builtin_mtsr(AVR32_COUNT, 0);
 325                                         while (__builtin_mfsr(AVR32_COUNT) < (F_CPU / 1000));
 326                                 }
 327                                 #elif (ARCH == ARCH_XMEGA)
 328                                 if (GCC_IS_COMPILE_CONST(Milliseconds))
 329                                 {
 330                                         _delay_ms(Milliseconds);
 331                                 }
 332                                 else
 333                                 {
 334                                         while (Milliseconds--)
 335                                           _delay_ms(1);
 336                                 }
 337                                 #endif
 338                         }
 339
 340                         /** Retrieves a mask which contains the current state of the global interrupts for the device. This
 341                          *  value can be stored before altering the global interrupt enable state, before restoring the
 342                          *  flag(s) back to their previous values after a critical section using \ref SetGlobalInterruptMask().
 343                          *
 344                          *  \ingroup Group_GlobalInt
 345                          *
 346                          *  \return  Mask containing the current Global Interrupt Enable Mask bit(s).
 347                          */
 348                         static inline uint_reg_t GetGlobalInterruptMask(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
 349                         static inline uint_reg_t GetGlobalInterruptMask(void)
 350                         {
 351                                 GCC_MEMORY_BARRIER();
 352
 353                                 #if (ARCH == ARCH_AVR8)
 354                                 return SREG;
 355                                 #elif (ARCH == ARCH_UC3)
 356                                 return __builtin_mfsr(AVR32_SR);
 357                                 #elif (ARCH == ARCH_XMEGA)
 358                                 return SREG;
 359                                 #endif
 360
 361                                 GCC_MEMORY_BARRIER();
 362                         }
 363
 364                         /** Sets the global interrupt enable state of the microcontroller to the mask passed into the function.
 365                          *  This can be combined with \ref GetGlobalInterruptMask() to save and restore the Global Interrupt Enable
 366                          *  Mask bit(s) of the device after a critical section has completed.
 367                          *
 368                          *  \ingroup Group_GlobalInt
 369                          *
 370                          *  \param[in] GlobalIntState  Global Interrupt Enable Mask value to use
 371                          */
 372                         static inline void SetGlobalInterruptMask(const uint_reg_t GlobalIntState) ATTR_ALWAYS_INLINE;
 373                         static inline void SetGlobalInterruptMask(const uint_reg_t GlobalIntState)
 374                         {
 375                                 GCC_MEMORY_BARRIER();
 376
 377                                 #if (ARCH == ARCH_AVR8)
 378                                 SREG = GlobalIntState;
 379                                 #elif (ARCH == ARCH_UC3)
 380                                 if (GlobalIntState & AVR32_SR_GM)
 381                                   __builtin_ssrf(AVR32_SR_GM_OFFSET);
 382                                 else
 383                                   __builtin_csrf(AVR32_SR_GM_OFFSET);
 384                                 #elif (ARCH == ARCH_XMEGA)
 385                                 SREG = GlobalIntState;
 386                                 #endif
 387
 388                                 GCC_MEMORY_BARRIER();
 389                         }
 390
 391                         /** Enables global interrupt handling for the device, allowing interrupts to be handled.
 392                          *
 393                          *  \ingroup Group_GlobalInt
 394                          */
 395                         static inline void GlobalInterruptEnable(void) ATTR_ALWAYS_INLINE;
 396                         static inline void GlobalInterruptEnable(void)
 397                         {
 398                                 GCC_MEMORY_BARRIER();
 399
 400                                 #if (ARCH == ARCH_AVR8)
 401                                 sei();
 402                                 #elif (ARCH == ARCH_UC3)
 403                                 __builtin_csrf(AVR32_SR_GM_OFFSET);
 404                                 #elif (ARCH == ARCH_XMEGA)
 405                                 sei();
 406                                 #endif
 407
 408                                 GCC_MEMORY_BARRIER();
 409                         }
 410
 411                         /** Disabled global interrupt handling for the device, preventing interrupts from being handled.
 412                          *
 413                          *  \ingroup Group_GlobalInt
 414                          */
 415                         static inline void GlobalInterruptDisable(void) ATTR_ALWAYS_INLINE;
 416                         static inline void GlobalInterruptDisable(void)
 417                         {
 418                                 GCC_MEMORY_BARRIER();
 419
 420                                 #if (ARCH == ARCH_AVR8)
 421                                 cli();
 422                                 #elif (ARCH == ARCH_UC3)
 423                                 __builtin_ssrf(AVR32_SR_GM_OFFSET);
 424                                 #elif (ARCH == ARCH_XMEGA)
 425                                 cli();
 426                                 #endif
 427
 428                                 GCC_MEMORY_BARRIER();
 429                         }
 430
 431         /* Disable C linkage for C++ Compilers: */
 432                 #if defined(__cplusplus)
 433                         }
 434                 #endif
 435
 436 #endif
 437
 438 /** @} */
 439