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172 lines
6.7 KiB
172 lines
6.7 KiB
16 years ago
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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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*
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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 headees, such as Atomic.h, FunctionAttributes.h and BoardTypes.h.
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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 <avr/io.h>
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#include <stdio.h>
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#include <avr/version.h>
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#include "FunctionAttributes.h"
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#include "BoardTypes.h"
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#include <alloca.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-statment 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 discreete block and not as a list of seperate statements which may cause problems when used as
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* a block (such as inline IF statments).
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*/
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#define MACROS do
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/** Macro for encasing other multi-statment macros. This should be used along with a preceeding 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 discreete block and not as a list of seperate statements which may cause problems when used as
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* a block (such as inline IF statments).
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*/
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#define MACROE while (0)
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/** Defines a volatile NOP statment 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 optimizer
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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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#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 statment. 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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#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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#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 serial stream if false. As a
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* prerequisite for this macro, the serial stream should be configured via the Serial_Stream driver.
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*
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* The serial output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion
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* {x} failed."
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*/
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#define SERIAL_STREAM_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); \
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} }MACROE
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/* Inline Functions: */
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/** Function for reliably setting the AVR's system clock prescaler, using inline assembly. This function
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* is guaranteed to operate reliably regardless of optimization setting or other compile time options.
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*
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* \param PrescalerMask The mask of the new prescaler setting for CLKPR
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*/
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static inline void SetSystemClockPrescaler(uint8_t PrescalerMask)
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{
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uint8_t tmp = (1 << CLKPCE);
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__asm__ __volatile__ (
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"in __tmp_reg__,__SREG__" "\n\t"
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"cli" "\n\t"
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"sts %1, %0" "\n\t"
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"sts %1, %2" "\n\t"
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"out __SREG__, __tmp_reg__"
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: /* no outputs */
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: "d" (tmp),
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"M" (_SFR_MEM_ADDR(CLKPR)),
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"d" (PrescalerMask)
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: "r0");
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}
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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 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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* \param Word Word of data whose bytes are to be swapped
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*/
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static inline uint16_t SwapEndian_16(uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
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static inline uint16_t SwapEndian_16(uint16_t Word)
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{
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return ((Word >> 8) | (Word << 8));
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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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* \param 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(uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
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static inline uint32_t SwapEndian_32(uint32_t DWord)
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{
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return (((DWord & 0xFF000000) >> 24) |
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((DWord & 0x00FF0000) >> 8) |
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((DWord & 0x0000FF00) << 8) |
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((DWord & 0x000000FF) << 24));
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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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* \param Data Pointer to a number containing an even number of bytes to be reversed
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* \param Bytes Length of the data in bytes
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*/
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static inline void SwapEndian_n(uint8_t* Data, uint8_t Bytes);
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static inline void SwapEndian_n(uint8_t* Data, uint8_t Bytes)
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{
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uint8_t Temp;
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while (Bytes)
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{
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Temp = *Data;
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*Data = *(Data + Bytes - 1);
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*(Data + Bytes) = Temp;
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Data++;
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Bytes -= 2;
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}
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}
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#endif
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