242 lines
9.4 KiB
C
242 lines
9.4 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2011.
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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 2011 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 headers, macros and functions.
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*
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* \copydetails Group_Common
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*/
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/** \defgroup Group_Common Common Utility Headers - LUFA/Drivers/Common/Common.h
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* \brief Common library convenience headers, macros and functions.
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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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* \brief Convenience macros to aid in debugging applications.
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*
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* Macros to aid debugging of a user application.
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*/
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#ifndef __LUFA_COMMON_H__
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#define __LUFA_COMMON_H__
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/* Macros: */
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#if !defined(__DOXYGEN__)
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#define __INCLUDE_FROM_COMMON_H
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#endif
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/* Includes: */
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stddef.h>
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#include "Architectures.h"
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#include "Attributes.h"
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#include "BoardTypes.h"
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/* Architecture specific utility includes: */
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#if defined(__DOXYGEN__)
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/** Type define for an unsigned integer the same width as the selected architecture's machine register. */
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typedef MACHINE_REG_t uint_reg_t;
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#elif (ARCH == ARCH_AVR8)
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <avr/eeprom.h>
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#include <avr/boot.h>
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#include <util/atomic.h>
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#include <util/delay.h>
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typedef uint8_t uint_reg_t;
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#define ARCH_LITTLE_ENDIAN
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#include "Endianness.h"
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#elif (ARCH == ARCH_UC3)
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#include <avr32/io.h>
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// === TODO: Find abstracted way to handle these ===
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#define ISR(Name) void Name (void) __attribute__((__interrupt__)); void Name (void)
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#define PROGMEM const
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#define ATOMIC_BLOCK(x) if (1)
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#define ATOMIC_RESTORESTATE
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#define pgm_read_byte(x) *x
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#define _delay_ms(x)
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#define memcmp_P(...) memcmp(__VA_ARGS__)
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#define memcpy_P(...) memcpy(__VA_ARGS__)
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#define USE_RAM_DESCRIPTORS
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// ==================================================
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typedef uint32_t uint_reg_t;
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#define ARCH_BIG_ENDIAN
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#include "Endianness.h"
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#else
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#error Unknown device architecture specified.
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#endif
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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 \c 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 \c if statements).
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*/
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#define MACROE while (0)
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/** Convenience macro to determine the larger of two values.
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*
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* \note This macro should only be used with operands that do not have side effects from being evaluated
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* multiple times.
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*
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* \param[in] x First value to compare
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* \param[in] y First value to compare
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*
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* \return The larger of the two input parameters
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*/
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#if !defined(MAX) || defined(__DOXYGEN__)
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#define MAX(x, y) ((x > y) ? x : y)
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#endif
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/** Convenience macro to determine the smaller of two values.
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*
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* \note This macro should only be used with operands that do not have side effects from being evaluated
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* multiple times.
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*
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* \param[in] x First value to compare
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* \param[in] y First value to compare
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*
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* \return The smaller of the two input parameters
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*/
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#if !defined(MIN) || defined(__DOXYGEN__)
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#define MIN(x, y) ((x < y) ? x : y)
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#endif
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#if (ARCH == ARCH_AVR8) || defined(__DOXYGEN__)
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/** Defines a volatile \c 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 assembly \c 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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#if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
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/** Reads a pointer out of PROGMEM space on the AVR8 architecture. This is currently a wrapper for the
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* avr-libc \c pgm_read_ptr() macro with a \c void* cast, so that its value can be assigned directly
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* to a pointer variable or used in pointer arithmetic without further casting in C. In a future
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* avr-libc distribution this will be part of the standard API and will be implemented in a more formal
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* 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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/** Macro for testing condition "x" and breaking via \ref JTAG_DEBUG_BREAK() if the condition is false.
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*
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* \param[in] Condition Condition that will be evaluated,
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*
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* \ingroup Group_Debugging
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*/
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#define JTAG_DEBUG_ASSERT(Condition) MACROS{ if (!(Condition)) { JTAG_DEBUG_BREAK(); } }MACROE
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/** Macro for testing condition "x" and writing debug data to the stdout stream if \c 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 microcontroller's
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* USART peripheral.
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*
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* The output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion {Condition} failed."
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*
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* \param[in] Condition Condition that will be evaluated,
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*
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* \ingroup Group_Debugging
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*/
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#define STDOUT_ASSERT(Condition) 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__, #Condition); } }MACROE
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#endif
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/** Forces GCC to use pointer indirection (via the device'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 \c 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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/** Forces GCC to create a memory barrier, ensuring that memory accesses are not reordered past the barrier point.
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* This can be used before ordering-critical operations, to ensure that the compiler does not re-order the resulting
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* assembly output in an unexpected manner on sections of code that are ordering-specific.
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*/
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#define GCC_MEMORY_BARRIER() __asm__ __volatile__("" ::: "memory");
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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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* \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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#endif
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/** @} */
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