LUFA/Common/ArchitectureSpecific.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 Architecture specific definitions relating to specific processor architectures.
  33  *
  34  *  \copydetails Group_ArchitectureSpecific
  35  *
  36  *  \note Do not include this file directly, rather include the Common.h header file instead to gain this file's
  37  *        functionality.
  38  */
  39
  40 /** \ingroup Group_Common
  41  *  \defgroup Group_ArchitectureSpecific Architecture Specific Definitions
  42  *  \brief Architecture specific definitions relating to specific processor architectures.
  43  *
  44  *  Architecture specific macros, functions and other definitions, which relate to specific architectures. This
  45  *  definitions may or may not be available in some form on other architectures, and thus should be protected by
  46  *  preprocessor checks in portable code to prevent compile errors.
  47  *
  48  *  @{
  49  */
  50
  51 #ifndef __LUFA_ARCHSPEC_H__
  52 #define __LUFA_ARCHSPEC_H__
  53
  54         /* Preprocessor Checks: */
  55                 #if !defined(__INCLUDE_FROM_COMMON_H)
  56                         #error Do not include this file directly. Include LUFA/Common/Common.h instead to gain this functionality.
  57                 #endif
  58
  59         /* Enable C linkage for C++ Compilers: */
  60                 #if defined(__cplusplus)
  61                         extern "C" {
  62                 #endif
  63
  64         /* Public Interface - May be used in end-application: */
  65                 /* Macros: */
  66                         #if (ARCH == ARCH_AVR8) || defined(__DOXYGEN__)
  67                                 /** Disables the AVR's JTAG bus in software, until a system reset. This will override the current JTAG
  68                                  *  status as set by the JTAGEN fuse, disabling JTAG debugging and reverting the JTAG pins back to GPIO
  69                                  *  mode.
  70                                  *
  71                                  *  \note This macro is not available for all architectures.
  72                                  */
  73                                 #define JTAG_DISABLE()                  MACROS{                                      \
  74                                                                                 __asm__ __volatile__ (               \
  75                                                                                 "in __tmp_reg__,__SREG__" "\n\t"     \
  76                                                                                 "cli" "\n\t"                         \
  77                                                                                 "out %1, %0" "\n\t"                  \
  78                                                                                 "out __SREG__, __tmp_reg__" "\n\t"   \
  79                                                                                 "out %1, %0" "\n\t"                  \
  80                                                                                 :                                    \
  81                                                                                 : "r" (1 << JTD),                    \
  82                                                                                   "M" (_SFR_IO_ADDR(MCUCR))          \
  83                                                                                 : "r0");                             \
  84                                                                         }MACROE
  85
  86                                 /** Defines a volatile \c NOP statement which cannot be optimized out by the compiler, and thus can always
  87                                  *  be set as a breakpoint in the resulting code. Useful for debugging purposes, where the optimizer
  88                                  *  removes/reorders code to the point where break points cannot reliably be set.
  89                                  *
  90                                  *  \note This macro is not available for all architectures.
  91                                  */
  92                                 #define JTAG_DEBUG_POINT()              __asm__ __volatile__ ("nop" ::)
  93
  94                                 /** Defines an explicit JTAG break point in the resulting binary via the assembly \c BREAK statement. When
  95                                  *  a JTAG is used, this causes the program execution to halt when reached until manually resumed.
  96                                  *
  97                                  *  \note This macro is not available for all architectures.
  98                                  */
  99                                 #define JTAG_DEBUG_BREAK()              __asm__ __volatile__ ("break" ::)
 100
 101                                 /** Macro for testing condition "x" and breaking via \ref JTAG_DEBUG_BREAK() if the condition is false.
 102                                  *
 103                                  *  \note This macro is not available for all architectures.
 104                                  *
 105                                  *  \param[in] Condition  Condition that will be evaluated.
 106                                 */
 107                                 #define JTAG_ASSERT(Condition)          MACROS{ if (!(Condition)) { JTAG_DEBUG_BREAK(); } }MACROE
 108
 109                                 /** Macro for testing condition \c "x" and writing debug data to the stdout stream if \c false. The stdout stream
 110                                  *  must be pre-initialized before this macro is run and linked to an output device, such as the microcontroller's
 111                                  *  USART peripheral.
 112                                  *
 113                                  *  The output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion {Condition} failed."
 114                                  *
 115                                  *  \note This macro is not available for all architectures.
 116                                  *
 117                                  *  \param[in] Condition  Condition that will be evaluated,
 118                                  */
 119                                 #define STDOUT_ASSERT(Condition)        MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: "   \
 120                                                                                 "Assertion \"%s\" failed.\r\n"),     \
 121                                                                                 __FILE__, __func__, __LINE__, #Condition); } }MACROE
 122
 123                                 #if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
 124                                         /** Reads a pointer out of PROGMEM space on the AVR8 architecture. This is currently a wrapper for the
 125                                          *  avr-libc \c pgm_read_ptr() macro with a \c void* cast, so that its value can be assigned directly
 126                                          *  to a pointer variable or used in pointer arithmetic without further casting in C. In a future
 127                                          *  avr-libc distribution this will be part of the standard API and will be implemented in a more formal
 128                                          *  manner.
 129                                          *
 130                                          *  \note This macro is not available for all architectures.
 131                                          *
 132                                          *  \param[in] Address  Address of the pointer to read.
 133                                          *
 134                                          *  \return Pointer retrieved from PROGMEM space.
 135                                          */
 136                                         #define pgm_read_ptr(Address)        (void*)pgm_read_word(Address)
 137                                 #endif
 138                         #endif
 139
 140         /* Disable C linkage for C++ Compilers: */
 141                 #if defined(__cplusplus)
 142                         }
 143                 #endif
 144
 145 #endif
 146
 147 /** @} */
 148