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264 lines
9.8 KiB
264 lines
9.8 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Common library convenience macros and functions.
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*
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* This file contains macros which are common to all library elements, and which may be useful in user code. It
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* also includes other common headers, such as Atomic.h, Attributes.h and BoardTypes.h.
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*/
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/** @defgroup Group_Common Common Utility Headers - LUFA/Drivers/Common/Common.h
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*
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* Common utility headers containing macros, functions, enums and types which are common to all
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* aspects of the library.
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*
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* @{
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*/
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/** @defgroup Group_Debugging Debugging Macros
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*
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* Macros for debugging use.
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*/
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/** @defgroup Group_BitManip Endian and Bit Macros
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*
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* Functions for swapping endianness and reversing bit orders.
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*/
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#ifndef __COMMON_H__
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#define __COMMON_H__
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/* Includes: */
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#include <stdint.h>
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#include <stdbool.h>
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#include "Attributes.h"
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#include "BoardTypes.h"
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Macro for encasing other multi-statement macros. This should be used along with an opening brace
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* before the start of any multi-statement macro, so that the macros contents as a whole are treated
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* as a discrete block and not as a list of separate statements which may cause problems when used as
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* a block (such as inline IF statements).
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*/
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#define MACROS do
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/** Macro for encasing other multi-statement macros. This should be used along with a preceding closing
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* brace at the end of any multi-statement macro, so that the macros contents as a whole are treated
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* as a discrete block and not as a list of separate statements which may cause problems when used as
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* a block (such as inline IF statements).
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*/
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#define MACROE while (0)
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/** Defines a volatile NOP statement which cannot be optimized out by the compiler, and thus can always
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* be set as a breakpoint in the resulting code. Useful for debugging purposes, where the optimiser
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* removes/reorders code to the point where break points cannot reliably be set.
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*
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* \ingroup Group_Debugging
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*/
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#define JTAG_DEBUG_POINT() __asm__ __volatile__ ("NOP" ::)
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/** Defines an explicit JTAG break point in the resulting binary via the ASM BREAK statement. When
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* a JTAG is used, this causes the program execution to halt when reached until manually resumed.
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*
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* \ingroup Group_Debugging
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*/
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#define JTAG_DEBUG_BREAK() __asm__ __volatile__ ("BREAK" ::)
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/** Macro for testing condition "x" and breaking via JTAG_DEBUG_BREAK() if the condition is false.
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*
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* \ingroup Group_Debugging
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*/
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#define JTAG_DEBUG_ASSERT(x) MACROS{ if (!(x)) { JTAG_DEBUG_BREAK(); } }MACROE
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/** Macro for testing condition "x" and writing debug data to the stdout stream if false. The stdout stream
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* must be pre-initialized before this macro is run and linked to an output device, such as the AVR's USART
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* peripheral.
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*
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* The output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion {x} failed."
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*
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* \ingroup Group_Debugging
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*/
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#define STDOUT_ASSERT(x) MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: " \
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"Assertion \"%s\" failed.\r\n"), \
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__FILE__, __func__, __LINE__, #x); } }MACROE
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/** Forces GCC to use pointer indirection (via the AVR's pointer register pairs) when accessing the given
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* struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through
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* a pointer, resulting in a larger binary. When this macro is used on a (non-const) structure pointer before
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* use, it will force GCC to use pointer indirection on the elements rather than direct store and load
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* instructions.
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*
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* \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode.
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*/
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#define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
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#if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
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/** Reads a pointer out of PROGMEM space. This is currently a wrapper for the avr-libc pgm_read_ptr()
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* macro with a void* cast, so that its value can be assigned directly to a pointer variable or used
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* in pointer arithmetic without further casting in C. In a future avr-libc distribution this will be
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* part of the standard API and will be implemented in a more formal manner.
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*
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* \param[in] Addr Address of the pointer to read.
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*
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* \return Pointer retrieved from PROGMEM space.
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*/
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#define pgm_read_ptr(Addr) (void*)pgm_read_word(Addr)
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#endif
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/** Swaps the byte ordering of a 16-bit value at compile time. Do not use this macro for swapping byte orderings
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* of dynamic values computed at runtime, use \ref SwapEndian_16() instead. The result of this macro can be used
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* inside struct or other variable initializers outside of a function, something that is not possible with the
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* inline function variant.
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*
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* \param[in] x 16-bit value whose byte ordering is to be swapped.
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*
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* \return Input value with the byte ordering reversed.
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*/
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#define SWAPENDIAN_16(x) ((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))
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/** Swaps the byte ordering of a 32-bit value at compile time. Do not use this macro for swapping byte orderings
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* of dynamic values computed at runtime- use \ref SwapEndian_32() instead. The result of this macro can be used
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* inside struct or other variable initializers outside of a function, something that is not possible with the
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* inline function variant.
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*
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* \param[in] x 32-bit value whose byte ordering is to be swapped.
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*
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* \return Input value with the byte ordering reversed.
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*/
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#define SWAPENDIAN_32(x) ((((x) & 0xFF000000UL) >> 24UL) | (((x) & 0x00FF0000UL) >> 8UL) | \
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(((x) & 0x0000FF00UL) << 8UL) | (((x) & 0x000000FFUL) << 24UL))
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/* Inline Functions: */
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/** Function to reverse the individual bits in a byte - i.e. bit 7 is moved to bit 0, bit 6 to bit 1,
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* etc.
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*
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* \ingroup Group_BitManip
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*
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* \param[in] Byte Byte of data whose bits are to be reversed.
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*/
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static inline uint8_t BitReverse(uint8_t Byte) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
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static inline uint8_t BitReverse(uint8_t Byte)
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{
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Byte = (((Byte & 0xF0) >> 4) | ((Byte & 0x0F) << 4));
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Byte = (((Byte & 0xCC) >> 2) | ((Byte & 0x33) << 2));
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Byte = (((Byte & 0xAA) >> 1) | ((Byte & 0x55) << 1));
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return Byte;
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}
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/** Function to reverse the byte ordering of the individual bytes in a 16 bit number.
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*
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* \ingroup Group_BitManip
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*
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* \param[in] Word Word of data whose bytes are to be swapped.
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*/
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static inline uint16_t SwapEndian_16(const uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
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static inline uint16_t SwapEndian_16(const uint16_t Word)
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{
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uint8_t Temp;
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union
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{
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uint16_t Word;
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uint8_t Bytes[2];
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} Data;
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Data.Word = Word;
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Temp = Data.Bytes[0];
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Data.Bytes[0] = Data.Bytes[1];
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Data.Bytes[1] = Temp;
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return Data.Word;
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}
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/** Function to reverse the byte ordering of the individual bytes in a 32 bit number.
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*
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* \ingroup Group_BitManip
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*
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* \param[in] DWord Double word of data whose bytes are to be swapped.
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*/
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static inline uint32_t SwapEndian_32(const uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
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static inline uint32_t SwapEndian_32(const uint32_t DWord)
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{
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uint8_t Temp;
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union
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{
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uint32_t DWord;
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uint8_t Bytes[4];
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} Data;
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Data.DWord = DWord;
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Temp = Data.Bytes[0];
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Data.Bytes[0] = Data.Bytes[3];
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Data.Bytes[3] = Temp;
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Temp = Data.Bytes[1];
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Data.Bytes[1] = Data.Bytes[2];
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Data.Bytes[2] = Temp;
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return Data.DWord;
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}
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/** Function to reverse the byte ordering of the individual bytes in a n byte number.
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*
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* \ingroup Group_BitManip
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*
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* \param[in,out] Data Pointer to a number containing an even number of bytes to be reversed.
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* \param[in] Bytes Length of the data in bytes.
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*/
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static inline void SwapEndian_n(void* Data,
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uint8_t Bytes) ATTR_NON_NULL_PTR_ARG(1);
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static inline void SwapEndian_n(void* Data,
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uint8_t Bytes)
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{
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uint8_t* CurrDataPos = (uint8_t*)Data;
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while (Bytes > 1)
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{
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uint8_t Temp = *CurrDataPos;
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*CurrDataPos = *(CurrDataPos + Bytes - 1);
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*(CurrDataPos + Bytes - 1) = Temp;
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CurrDataPos++;
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Bytes -= 2;
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}
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}
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#endif
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/** @} */
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