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如题，部分代码如下
/**************************************************************************//**
* @file core_cm3.c
* @brief CMSIS Cortex-M3 Core Peripheral Access Layer Source File
* @version V1.30
* @date 30. October 2009
*
* @note
* Copyright (C) 2009 ARM Limited. All rights reserved.
*
* @par
* ARM Limited (ARM) is supplying this software for use with Cortex-M
* processor based microcontrollers. This file can be freely distributed
* within development tools that are supporting such ARM based processors.
*
* @par
* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
* ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
*
******************************************************************************/
#include <stdint.h>
/* define compiler specific symbols */
#if defined ( __CC_ARM )
#define __ASM __asm /*!< asm keyword for ARM Compiler */
#define __INLINE __inline /*!< inline keyword for ARM Compiler */
#elif defined ( __ICCARM__ )
#define __ASM __asm /*!< asm keyword for IAR Compiler */
#define __INLINE inline /*!< inline keyword for IAR Compiler. Only avaiable in High optimization mode! */
#elif defined ( __GNUC__ )
#define __ASM __asm /*!< asm keyword for GNU Compiler */
#define __INLINE inline /*!< inline keyword for GNU Compiler */
#elif defined ( __TASKING__ )
#define __ASM __asm /*!< asm keyword for TASKING Compiler */
#define __INLINE inline /*!< inline keyword for TASKING Compiler */
#endif
/* ################### Compiler specific Intrinsics ########################### */
#if defined ( __CC_ARM ) /*------------------RealView Compiler -----------------*/
/* ARM armcc specific functions */
/**
* @brief Return the Process Stack Pointer
*
* @return ProcessStackPointer
*
* Return the actual process stack pointer
*/
__ASM uint32_t __get_PSP(void)
{
mrs r0, psp
bx lr
}
/**
* @brief Set the Process Stack Pointer
*
* @param topOfProcStack Process Stack Pointer
*
* Assign the value ProcessStackPointer to the MSP
* (process stack pointer) Cortex processor register
*/
__ASM void __set_PSP(uint32_t topOfProcStack)
{
msr psp, r0
bx lr
}
/**
* @brief Return the Main Stack Pointer
*
* @return Main Stack Pointer
*
* Return the current value of the MSP (main stack pointer)
* Cortex processor register
*/
__ASM uint32_t __get_MSP(void)
{
mrs r0, msp
bx lr
}
/**
* @brief Set the Main Stack Pointer
*
* @param topOfMainStack Main Stack Pointer
*
* Assign the value mainStackPointer to the MSP
* (main stack pointer) Cortex processor register
*/
__ASM void __set_MSP(uint32_t mainStackPointer)
{
msr msp, r0
bx lr
}
/**
* @brief Reverse byte order in unsigned short value
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in unsigned short value
*/
__ASM uint32_t __REV16(uint16_t value)
{
rev16 r0, r0
bx lr
}
/**
* @brief Reverse byte order in signed short value with sign extension to integer
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in signed short value with sign extension to integer
*/
__ASM int32_t __REVSH(int16_t value)
{
revsh r0, r0
bx lr
}
#if (__ARMCC_VERSION < 400000)
/**
* @brief Remove the exclusive lock created by ldrex
*
* Removes the exclusive lock which is created by ldrex.
*/
__ASM void __CLREX(void)
{
clrex
}
/**
* @brief Return the Base Priority value
*
* @return BasePriority
*
* Return the content of the base priority register
*/
__ASM uint32_t __get_BASEPRI(void)
{
mrs r0, basepri
bx lr
}
/**
* @brief Set the Base Priority value
*
* @param basePri BasePriority
*
* Set the base priority register
*/
__ASM void __set_BASEPRI(uint32_t basePri)
{
msr basepri, r0
bx lr
}
/**
* @brief Return the Priority Mask value
*
* @return PriMask
*
* Return state of the priority mask bit from the priority mask register
*/
__ASM uint32_t __get_PRIMASK(void)
{
mrs r0, primask
bx lr
}
/**
* @brief Set the Priority Mask value
*
* @param priMask PriMask
*
* Set the priority mask bit in the priority mask register
*/
__ASM void __set_PRIMASK(uint32_t priMask)
{
msr primask, r0
bx lr
}
/**
* @brief Return the Fault Mask value
*
* @return FaultMask
*
* Return the content of the fault mask register
*/
__ASM uint32_t __get_FAULTMASK(void)
{
mrs r0, faultmask
bx lr
}
/**
* @brief Set the Fault Mask value
*
* @param faultMask faultMask value
*
* Set the fault mask register
*/
__ASM void __set_FAULTMASK(uint32_t faultMask)
{
msr faultmask, r0
bx lr
}
/**
* @brief Return the Control Register value
*
* @return Control value
*
* Return the content of the control register
*/
__ASM uint32_t __get_CONTROL(void)
{
mrs r0, control
bx lr
}
/**
* @brief Set the Control Register value
*
* @param control Control value
*
* Set the control register
*/
__ASM void __set_CONTROL(uint32_t control)
{
msr control, r0
bx lr
}
#endif /* __ARMCC_VERSION */
#elif (defined (__ICCARM__)) /*------------------ ICC Compiler -------------------*/
/* IAR iccarm specific functions */
#pragma diag_suppress=Pe940
/**
* @brief Return the Process Stack Pointer
*
* @return ProcessStackPointer
*
* Return the actual process stack pointer
*/
uint32_t __get_PSP(void)
{
__ASM("mrs r0, psp");
__ASM("bx lr");
}
/**
* @brief Set the Process Stack Pointer
*
* @param topOfProcStack Process Stack Pointer
*
* Assign the value ProcessStackPointer to the MSP
* (process stack pointer) Cortex processor register
*/
void __set_PSP(uint32_t topOfProcStack)
{
__ASM("msr psp, r0");
__ASM("bx lr");
}
/**
* @brief Return the Main Stack Pointer
*
* @return Main Stack Pointer
*
* Return the current value of the MSP (main stack pointer)
* Cortex processor register
*/
uint32_t __get_MSP(void)
{
__ASM("mrs r0, msp");
__ASM("bx lr");
}
/**
* @brief Set the Main Stack Pointer
*
* @param topOfMainStack Main Stack Pointer
*
* Assign the value mainStackPointer to the MSP
* (main stack pointer) Cortex processor register
*/
void __set_MSP(uint32_t topOfMainStack)
{
__ASM("msr msp, r0");
__ASM("bx lr");
}
/**
* @brief Reverse byte order in unsigned short value
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in unsigned short value
*/
uint32_t __REV16(uint16_t value)
{
__ASM("rev16 r0, r0");
__ASM("bx lr");
}
/**
* @brief Reverse bit order of value
*
* @param value value to reverse
* @return reversed value
*
* Reverse bit order of value
*/
uint32_t __RBIT(uint32_t value)
{
__ASM("rbit r0, r0");
__ASM("bx lr");
}
/**
* @brief LDR Exclusive (8 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 8 bit values)
*/
uint8_t __LDREXB(uint8_t *addr)
{
__ASM("ldrexb r0, [r0]");
__ASM("bx lr");
}
/**
* @brief LDR Exclusive (16 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 16 bit values
*/
uint16_t __LDREXH(uint16_t *addr)
{
__ASM("ldrexh r0, [r0]");
__ASM("bx lr");
}
/**
* @brief LDR Exclusive (32 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 32 bit values
*/
uint32_t __LDREXW(uint32_t *addr)
{
__ASM("ldrex r0, [r0]");
__ASM("bx lr");
}
/**
* @brief STR Exclusive (8 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 8 bit values
*/
uint32_t __STREXB(uint8_t value, uint8_t *addr)
{
__ASM("strexb r0, r0, [r1]");
__ASM("bx lr");
}
/**
* @brief STR Exclusive (16 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 16 bit values
*/
uint32_t __STREXH(uint16_t value, uint16_t *addr)
{
__ASM("strexh r0, r0, [r1]");
__ASM("bx lr");
}
/**
* @brief STR Exclusive (32 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 32 bit values
*/
uint32_t __STREXW(uint32_t value, uint32_t *addr)
{
__ASM("strex r0, r0, [r1]");
__ASM("bx lr");
}
#pragma diag_default=Pe940
#elif (defined (__GNUC__)) /*------------------ GNU Compiler ---------------------*/
/* GNU gcc specific functions */
/**
* @brief Return the Process Stack Pointer
*
* @return ProcessStackPointer
*
* Return the actual process stack pointer
*/
uint32_t __get_PSP(void) __attribute__( ( naked ) );
uint32_t __get_PSP(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, psp\n\t"
"MOV r0, %0 \n\t"
"BX lr \n\t" : "=r" (result) );
return(result);
}
/**
* @brief Set the Process Stack Pointer
*
* @param topOfProcStack Process Stack Pointer
*
* Assign the value ProcessStackPointer to the MSP
* (process stack pointer) Cortex processor register
*/
void __set_PSP(uint32_t topOfProcStack) __attribute__( ( naked ) );
void __set_PSP(uint32_t topOfProcStack)
{
__ASM volatile ("MSR psp, %0\n\t"
"BX lr \n\t" : : "r" (topOfProcStack) );
}
/**
* @brief Return the Main Stack Pointer
*
* @return Main Stack Pointer
*
* Return the current value of the MSP (main stack pointer)
* Cortex processor register
*/
uint32_t __get_MSP(void) __attribute__( ( naked ) );
uint32_t __get_MSP(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, msp\n\t"
"MOV r0, %0 \n\t"
"BX lr \n\t" : "=r" (result) );
return(result);
}
/**
* @brief Set the Main Stack Pointer
*
* @param topOfMainStack Main Stack Pointer
*
* Assign the value mainStackPointer to the MSP
* (main stack pointer) Cortex processor register
*/
void __set_MSP(uint32_t topOfMainStack) __attribute__( ( naked ) );
void __set_MSP(uint32_t topOfMainStack)
{
__ASM volatile ("MSR msp, %0\n\t"
"BX lr \n\t" : : "r" (topOfMainStack) );
}
/**
* @brief Return the Base Priority value
*
* @return BasePriority
*
* Return the content of the base priority register
*/
uint32_t __get_BASEPRI(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, basepri_max" : "=r" (result) );
return(result);
}
/**
* @brief Set the Base Priority value
*
* @param basePri BasePriority
*
* Set the base priority register
*/
void __set_BASEPRI(uint32_t value)
{
__ASM volatile ("MSR basepri, %0" : : "r" (value) );
}
/**
* @brief Return the Priority Mask value
*
* @return PriMask
*
* Return state of the priority mask bit from the priority mask register
*/
uint32_t __get_PRIMASK(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, primask" : "=r" (result) );
return(result);
}
/**
* @brief Set the Priority Mask value
*
* @param priMask PriMask
*
* Set the priority mask bit in the priority mask register
*/
void __set_PRIMASK(uint32_t priMask)
{
__ASM volatile ("MSR primask, %0" : : "r" (priMask) );
}
/**
* @brief Return the Fault Mask value
*
* @return FaultMask
*
* Return the content of the fault mask register
*/
uint32_t __get_FAULTMASK(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, faultmask" : "=r" (result) );
return(result);
}
/**
* @brief Set the Fault Mask value
*
* @param faultMask faultMask value
*
* Set the fault mask register
*/
void __set_FAULTMASK(uint32_t faultMask)
{
__ASM volatile ("MSR faultmask, %0" : : "r" (faultMask) );
}
/**
* @brief Return the Control Register value
*
* @return Control value
*
* Return the content of the control register
*/
uint32_t __get_CONTROL(void)
{
uint32_t result=0;
__ASM volatile ("MRS %0, control" : "=r" (result) );
return(result);
}
/**
* @brief Set the Control Register value
*
* @param control Control value
*
* Set the control register
*/
void __set_CONTROL(uint32_t control)
{
__ASM volatile ("MSR control, %0" : : "r" (control) );
}
/**
* @brief Reverse byte order in integer value
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in integer value
*/
uint32_t __REV(uint32_t value)
{
uint32_t result=0;
__ASM volatile ("rev %0, %1" : "=r" (result) : "r" (value) );
return(result);
}
/**
* @brief Reverse byte order in unsigned short value
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in unsigned short value
*/
uint32_t __REV16(uint16_t value)
{
uint32_t result=0;
__ASM volatile ("rev16 %0, %1" : "=r" (result) : "r" (value) );
return(result);
}
/**
* @brief Reverse byte order in signed short value with sign extension to integer
*
* @param value value to reverse
* @return reversed value
*
* Reverse byte order in signed short value with sign extension to integer
*/
int32_t __REVSH(int16_t value)
{
uint32_t result=0;
__ASM volatile ("revsh %0, %1" : "=r" (result) : "r" (value) );
return(result);
}
/**
* @brief Reverse bit order of value
*
* @param value value to reverse
* @return reversed value
*
* Reverse bit order of value
*/
uint32_t __RBIT(uint32_t value)
{
uint32_t result=0;
__ASM volatile ("rbit %0, %1" : "=r" (result) : "r" (value) );
return(result);
}
/**
* @brief LDR Exclusive (8 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 8 bit value
*/
uint8_t __LDREXB(uint8_t *addr)
{
uint8_t result=0;
__ASM volatile ("ldrexb %0, [%1]" : "=r" (result) : "r" (addr) );
return(result);
}
/**
* @brief LDR Exclusive (16 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 16 bit values
*/
uint16_t __LDREXH(uint16_t *addr)
{
uint16_t result=0;
__ASM volatile ("ldrexh %0, [%1]" : "=r" (result) : "r" (addr) );
return(result);
}
/**
* @brief LDR Exclusive (32 bit)
*
* @param *addr address pointer
* @return value of (*address)
*
* Exclusive LDR command for 32 bit values
*/
uint32_t __LDREXW(uint32_t *addr)
{
uint32_t result=0;
__ASM volatile ("ldrex %0, [%1]" : "=r" (result) : "r" (addr) );
return(result);
}
/**
* @brief STR Exclusive (8 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 8 bit values
*/
uint32_t __STREXB(uint8_t value, uint8_t *addr)
{
uint32_t result=0;
__ASM volatile ("strexb %0, %2, [%1]" : "=r" (result) : "r" (addr), "r" (value) );
return(result);
}
/**
* @brief STR Exclusive (16 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 16 bit values
*/
uint32_t __STREXH(uint16_t value, uint16_t *addr)
{
uint32_t result=0;
__ASM volatile ("strexh %0, %2, [%1]" : "=r" (result) : "r" (addr), "r" (value) );
return(result);
}
/**
* @brief STR Exclusive (32 bit)
*
* @param value value to store
* @param *addr address pointer
* @return successful / failed
*
* Exclusive STR command for 32 bit values
*/
uint32_t __STREXW(uint32_t value, uint32_t *addr)
{
uint32_t result=0;
__ASM volatile ("strex %0, %2, [%1]" : "=r" (result) : "r" (addr), "r" (value) );
return(result);
}
#elif (defined (__TASKING__)) /*------------------ TASKING Compiler ---------------------*/
/* TASKING carm specific functions */
/*
* The CMSIS functions have been implemented as intrinsics in the compiler.
* Please use "carm -?i" to get an up to date list of all instrinsics,
* Including the CMSIS ones.
*/
#endif
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