/*
LUFA Library
- Copyright (C) Dean Camera, 2011.
+ Copyright (C) Dean Camera, 2012.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2012 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
this software.
*/
+/** \dir
+ * \brief Common library header files.
+ *
+ * This folder contains header files which are common to all parts of the LUFA library. They may be used freely in
+ * user applications.
+ */
+
/** \file
* \brief Common library convenience headers, macros and functions.
*
* @{
*/
-/** \defgroup Group_Debugging Debugging Macros
- * \brief Convenience macros to aid in debugging applications.
- *
- * Macros to aid debugging of a user application.
- */
-
-/** \defgroup Group_BitManip Endian and Bit Macros
- * \brief Convenience macros to aid in bit manipulations and endianness transforms.
+/** \defgroup Group_GlobalInt Global Interrupt Macros
+ * \brief Convenience macros for the management of interrupts globally within the device.
*
- * Functions for swapping endianness and reversing bit orders of data.
+ * Macros and functions to create and control global interrupts within the device.
*/
#ifndef __LUFA_COMMON_H__
#define __LUFA_COMMON_H__
/* Macros: */
- #if !defined(__DOXYGEN__)
- #define __INCLUDE_FROM_COMMON_H
- #endif
-
+ #define __INCLUDE_FROM_COMMON_H
+
/* Includes: */
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stddef.h>
-
+
#include "Architectures.h"
- #include "Attributes.h"
#include "BoardTypes.h"
-
+ #include "ArchitectureSpecific.h"
+ #include "CompilerSpecific.h"
+ #include "Attributes.h"
+
+ #if defined(USE_LUFA_CONFIG_HEADER)
+ #include "LUFAConfig.h"
+ #endif
+
+ /* Enable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+
/* Architecture specific utility includes: */
#if defined(__DOXYGEN__)
- /** Type define for an unsigned integer the same width as the selected architecture's machine register. */
+ /** Type define for an unsigned integer the same width as the selected architecture's machine register.
+ * This is distinct from the non-specific standard int data type, whose width is machine dependant but
+ * which may not reflect the actual machine register width on some targets (e.g. AVR8).
+ */
typedef MACHINE_REG_t uint_reg_t;
#elif (ARCH == ARCH_AVR8)
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/eeprom.h>
#include <avr/boot.h>
- #include <util/atomic.h>
+ #include <math.h>
#include <util/delay.h>
-
+
typedef uint8_t uint_reg_t;
- #elif (ARCH == ARCH_UC3B)
+
+ #define ARCH_HAS_EEPROM_ADDRESS_SPACE
+ #define ARCH_HAS_FLASH_ADDRESS_SPACE
+ #define ARCH_HAS_MULTI_ADDRESS_SPACE
+ #define ARCH_LITTLE_ENDIAN
+
+ #include "Endianness.h"
+ #elif (ARCH == ARCH_UC3)
#include <avr32/io.h>
+ #include <math.h>
+
+ // === TODO: Find abstracted way to handle these ===
+ #define PROGMEM
+ #define pgm_read_byte(x) *x
+ #define memcmp_P(...) memcmp(__VA_ARGS__)
+ #define memcpy_P(...) memcpy(__VA_ARGS__)
+ // =================================================
typedef uint32_t uint_reg_t;
-
- #warning The UC3B architecture support is currently experimental and incomplete!
+
+ #define ARCH_BIG_ENDIAN
+
+ #include "Endianness.h"
+ #elif (ARCH == ARCH_XMEGA)
+ #include <avr/io.h>
+ #include <avr/interrupt.h>
+ #include <avr/pgmspace.h>
+ #include <avr/eeprom.h>
+ #include <math.h>
+ #include <util/delay.h>
+
+ typedef uint8_t uint_reg_t;
+
+ #define ARCH_HAS_EEPROM_ADDRESS_SPACE
+ #define ARCH_HAS_FLASH_ADDRESS_SPACE
+ #define ARCH_HAS_MULTI_ADDRESS_SPACE
+ #define ARCH_LITTLE_ENDIAN
+
+ #include "Endianness.h"
+ #else
+ #error Unknown device architecture specified.
#endif
/* Public Interface - May be used in end-application: */
/** Convenience macro to determine the larger of two values.
*
- * \note This macro should only be used with operands that do not have side effects from being evaluated
- * multiple times.
+ * \attention This macro should only be used with operands that do not have side effects from being evaluated
+ * multiple times.
*
* \param[in] x First value to compare
* \param[in] y First value to compare
* \return The larger of the two input parameters
*/
#if !defined(MAX) || defined(__DOXYGEN__)
- #define MAX(x, y) ((x > y) ? x : y)
+ #define MAX(x, y) (((x) > (y)) ? (x) : (y))
#endif
/** Convenience macro to determine the smaller of two values.
*
- * \note This macro should only be used with operands that do not have side effects from being evaluated
- * multiple times.
+ * \attention This macro should only be used with operands that do not have side effects from being evaluated
+ * multiple times.
*
* \param[in] x First value to compare
* \param[in] y First value to compare
* \return The smaller of the two input parameters
*/
#if !defined(MIN) || defined(__DOXYGEN__)
- #define MIN(x, y) ((x < y) ? x : y)
+ #define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif
- #if (ARCH == ARCH_AVR8) || defined(__DOXYGEN__)
- /** Defines a volatile \c NOP statement which cannot be optimized out by the compiler, and thus can always
- * be set as a breakpoint in the resulting code. Useful for debugging purposes, where the optimiser
- * removes/reorders code to the point where break points cannot reliably be set.
+ #if !defined(STRINGIFY) || defined(__DOXYGEN__)
+ /** Converts the given input into a string, via the C Preprocessor. This macro puts literal quotation
+ * marks around the input, converting the source into a string literal.
*
- * \ingroup Group_Debugging
- */
- #define JTAG_DEBUG_POINT() __asm__ __volatile__ ("NOP" ::)
-
- /** Defines an explicit JTAG break point in the resulting binary via the assembly \c BREAK statement. When
- * a JTAG is used, this causes the program execution to halt when reached until manually resumed.
+ * \param[in] x Input to convert into a string literal.
*
- * \ingroup Group_Debugging
+ * \return String version of the input.
*/
- #define JTAG_DEBUG_BREAK() __asm__ __volatile__ ("BREAK" ::)
-
- #if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
- /** Reads a pointer out of PROGMEM space on the AVR8 architecture. This is currently a wrapper for the
- * avr-libc \c pgm_read_ptr() macro with a \c void* cast, so that its value can be assigned directly
- * to a pointer variable or used in pointer arithmetic without further casting in C. In a future
- * avr-libc distribution this will be part of the standard API and will be implemented in a more formal
- * manner.
- *
- * \param[in] Addr Address of the pointer to read.
- *
- * \return Pointer retrieved from PROGMEM space.
- */
- #define pgm_read_ptr(Addr) (void*)pgm_read_word(Addr)
- #endif
+ #define STRINGIFY(x) #x
- /** Macro for testing condition "x" and breaking via \ref JTAG_DEBUG_BREAK() if the condition is false.
+ /** Converts the given input into a string after macro expansion, via the C Preprocessor. This macro puts
+ * literal quotation marks around the expanded input, converting the source into a string literal.
*
- * \param[in] Condition Condition that will be evaluated,
+ * \param[in] x Input to expand and convert into a string literal.
*
- * \ingroup Group_Debugging
- */
- #define JTAG_DEBUG_ASSERT(Condition) MACROS{ if (!(Condition)) { JTAG_DEBUG_BREAK(); } }MACROE
+ * \return String version of the expanded input.
+ */
+ #define STRINGIFY_EXPANDED(x) STRINGIFY(x)
+ #endif
- /** Macro for testing condition "x" and writing debug data to the stdout stream if \c false. The stdout stream
- * must be pre-initialized before this macro is run and linked to an output device, such as the microcontroller's
- * USART peripheral.
+ #if !defined(ISR) || defined(__DOXYGEN__)
+ /** Macro for the definition of interrupt service routines, so that the compiler can insert the required
+ * prologue and epilogue code to properly manage the interrupt routine without affecting the main thread's
+ * state with unintentional side-effects.
+ *
+ * Interrupt handlers written using this macro may still need to be registered with the microcontroller's
+ * Interrupt Controller (if present) before they will properly handle incoming interrupt events.
*
- * The output takes the form "{FILENAME}: Function {FUNCTION NAME}, Line {LINE NUMBER}: Assertion {Condition} failed."
+ * \note This macro is only supplied on some architectures, where the standard library does not include a valid
+ * definition. If an existing definition exists, the alternative definition here will be ignored.
*
- * \param[in] Condition Condition that will be evaluated,
+ * \ingroup Group_GlobalInt
*
- * \ingroup Group_Debugging
+ * \param[in] Name Unique name of the interrupt service routine.
*/
- #define STDOUT_ASSERT(Condition) MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: " \
- "Assertion \"%s\" failed.\r\n"), \
- __FILE__, __func__, __LINE__, #Condition); } }MACROE
+ #define ISR(Name, ...) void Name (void) __attribute__((__interrupt__)) __VA_ARGS__; void Name (void)
#endif
-
- /** Forces GCC to use pointer indirection (via the device's pointer register pairs) when accessing the given
- * struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through
- * a pointer, resulting in a larger binary. When this macro is used on a (non \c const) structure pointer before
- * use, it will force GCC to use pointer indirection on the elements rather than direct store and load
- * instructions.
- *
- * \param[in, out] StructPtr Pointer to a structure which is to be forced into indirect access mode.
- */
- #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
-
- /** Swaps the byte ordering of a 16-bit value at compile time. Do not use this macro for swapping byte orderings
- * of dynamic values computed at runtime, use \ref SwapEndian_16() instead. The result of this macro can be used
- * inside struct or other variable initializers outside of a function, something that is not possible with the
- * inline function variant.
- *
- * \param[in] x 16-bit value whose byte ordering is to be swapped.
- *
- * \return Input value with the byte ordering reversed.
- */
- #define SWAPENDIAN_16(x) ((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))
-
- /** Swaps the byte ordering of a 32-bit value at compile time. Do not use this macro for swapping byte orderings
- * of dynamic values computed at runtime- use \ref SwapEndian_32() instead. The result of this macro can be used
- * inside struct or other variable initializers outside of a function, something that is not possible with the
- * inline function variant.
- *
- * \param[in] x 32-bit value whose byte ordering is to be swapped.
- *
- * \return Input value with the byte ordering reversed.
- */
- #define SWAPENDIAN_32(x) ((((x) & 0xFF000000UL) >> 24UL) | (((x) & 0x00FF0000UL) >> 8UL) | \
- (((x) & 0x0000FF00UL) << 8UL) | (((x) & 0x000000FFUL) << 24UL))
/* Inline Functions: */
/** Function to reverse the individual bits in a byte - i.e. bit 7 is moved to bit 0, bit 6 to bit 1,
* etc.
*
- * \ingroup Group_BitManip
- *
* \param[in] Byte Byte of data whose bits are to be reversed.
+ *
+ * \return Input data with the individual bits reversed (mirrored).
*/
static inline uint8_t BitReverse(uint8_t Byte) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
static inline uint8_t BitReverse(uint8_t Byte)
return Byte;
}
- /** Function to reverse the byte ordering of the individual bytes in a 16 bit number.
- *
- * \ingroup Group_BitManip
+ /** Function to perform a blocking delay for a specified number of milliseconds. The actual delay will be
+ * at a minimum the specified number of milliseconds, however due to loop overhead and internal calculations
+ * may be slightly higher.
*
- * \param[in] Word Word of data whose bytes are to be swapped.
+ * \param[in] Milliseconds Number of milliseconds to delay
*/
- static inline uint16_t SwapEndian_16(const uint16_t Word) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
- static inline uint16_t SwapEndian_16(const uint16_t Word)
+ static inline void Delay_MS(uint16_t Milliseconds) ATTR_ALWAYS_INLINE;
+ static inline void Delay_MS(uint16_t Milliseconds)
{
- uint8_t Temp;
-
- union
+ #if (ARCH == ARCH_AVR8)
+ if (GCC_IS_COMPILE_CONST(Milliseconds))
{
- uint16_t Word;
- uint8_t Bytes[2];
- } Data;
-
- Data.Word = Word;
-
- Temp = Data.Bytes[0];
- Data.Bytes[0] = Data.Bytes[1];
- Data.Bytes[1] = Temp;
-
- return Data.Word;
+ _delay_ms(Milliseconds);
+ }
+ else
+ {
+ while (Milliseconds--)
+ _delay_ms(1);
+ }
+ #elif (ARCH == ARCH_UC3)
+ while (Milliseconds--)
+ {
+ __builtin_mtsr(AVR32_COUNT, 0);
+ while ((uint32_t)__builtin_mfsr(AVR32_COUNT) < (F_CPU / 1000));
+ }
+ #elif (ARCH == ARCH_XMEGA)
+ if (GCC_IS_COMPILE_CONST(Milliseconds))
+ {
+ _delay_ms(Milliseconds);
+ }
+ else
+ {
+ while (Milliseconds--)
+ _delay_ms(1);
+ }
+ #endif
}
- /** Function to reverse the byte ordering of the individual bytes in a 32 bit number.
+ /** Retrieves a mask which contains the current state of the global interrupts for the device. This
+ * value can be stored before altering the global interrupt enable state, before restoring the
+ * flag(s) back to their previous values after a critical section using \ref SetGlobalInterruptMask().
*
- * \ingroup Group_BitManip
+ * \ingroup Group_GlobalInt
*
- * \param[in] DWord Double word of data whose bytes are to be swapped.
+ * \return Mask containing the current Global Interrupt Enable Mask bit(s).
*/
- static inline uint32_t SwapEndian_32(const uint32_t DWord) ATTR_WARN_UNUSED_RESULT ATTR_CONST;
- static inline uint32_t SwapEndian_32(const uint32_t DWord)
+ static inline uint_reg_t GetGlobalInterruptMask(void) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT;
+ static inline uint_reg_t GetGlobalInterruptMask(void)
{
- uint8_t Temp;
-
- union
- {
- uint32_t DWord;
- uint8_t Bytes[4];
- } Data;
+ GCC_MEMORY_BARRIER();
+
+ #if (ARCH == ARCH_AVR8)
+ return SREG;
+ #elif (ARCH == ARCH_UC3)
+ return __builtin_mfsr(AVR32_SR);
+ #elif (ARCH == ARCH_XMEGA)
+ return SREG;
+ #endif
+ }
- Data.DWord = DWord;
+ /** Sets the global interrupt enable state of the microcontroller to the mask passed into the function.
+ * This can be combined with \ref GetGlobalInterruptMask() to save and restore the Global Interrupt Enable
+ * Mask bit(s) of the device after a critical section has completed.
+ *
+ * \ingroup Group_GlobalInt
+ *
+ * \param[in] GlobalIntState Global Interrupt Enable Mask value to use
+ */
+ static inline void SetGlobalInterruptMask(const uint_reg_t GlobalIntState) ATTR_ALWAYS_INLINE;
+ static inline void SetGlobalInterruptMask(const uint_reg_t GlobalIntState)
+ {
+ GCC_MEMORY_BARRIER();
+
+ #if (ARCH == ARCH_AVR8)
+ SREG = GlobalIntState;
+ #elif (ARCH == ARCH_UC3)
+ if (GlobalIntState & AVR32_SR_GM)
+ __builtin_ssrf(AVR32_SR_GM_OFFSET);
+ else
+ __builtin_csrf(AVR32_SR_GM_OFFSET);
+ #elif (ARCH == ARCH_XMEGA)
+ SREG = GlobalIntState;
+ #endif
- Temp = Data.Bytes[0];
- Data.Bytes[0] = Data.Bytes[3];
- Data.Bytes[3] = Temp;
+ GCC_MEMORY_BARRIER();
+ }
- Temp = Data.Bytes[1];
- Data.Bytes[1] = Data.Bytes[2];
- Data.Bytes[2] = Temp;
+ /** Enables global interrupt handling for the device, allowing interrupts to be handled.
+ *
+ * \ingroup Group_GlobalInt
+ */
+ static inline void GlobalInterruptEnable(void) ATTR_ALWAYS_INLINE;
+ static inline void GlobalInterruptEnable(void)
+ {
+ GCC_MEMORY_BARRIER();
+
+ #if (ARCH == ARCH_AVR8)
+ sei();
+ #elif (ARCH == ARCH_UC3)
+ __builtin_csrf(AVR32_SR_GM_OFFSET);
+ #elif (ARCH == ARCH_XMEGA)
+ sei();
+ #endif
- return Data.DWord;
+ GCC_MEMORY_BARRIER();
}
- /** Function to reverse the byte ordering of the individual bytes in a n byte number.
- *
- * \ingroup Group_BitManip
+ /** Disabled global interrupt handling for the device, preventing interrupts from being handled.
*
- * \param[in,out] Data Pointer to a number containing an even number of bytes to be reversed.
- * \param[in] Bytes Length of the data in bytes.
+ * \ingroup Group_GlobalInt
*/
- static inline void SwapEndian_n(void* Data,
- uint8_t Bytes) ATTR_NON_NULL_PTR_ARG(1);
- static inline void SwapEndian_n(void* Data,
- uint8_t Bytes)
+ static inline void GlobalInterruptDisable(void) ATTR_ALWAYS_INLINE;
+ static inline void GlobalInterruptDisable(void)
{
- uint8_t* CurrDataPos = (uint8_t*)Data;
+ GCC_MEMORY_BARRIER();
+
+ #if (ARCH == ARCH_AVR8)
+ cli();
+ #elif (ARCH == ARCH_UC3)
+ __builtin_ssrf(AVR32_SR_GM_OFFSET);
+ #elif (ARCH == ARCH_XMEGA)
+ cli();
+ #endif
- while (Bytes > 1)
- {
- uint8_t Temp = *CurrDataPos;
- *CurrDataPos = *(CurrDataPos + Bytes - 1);
- *(CurrDataPos + Bytes - 1) = Temp;
+ GCC_MEMORY_BARRIER();
+ }
- CurrDataPos++;
- Bytes -= 2;
- }
+ /* Disable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
}
+ #endif
#endif
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