SPI.rar_lpc历程

/********************************************************************************************************* * @file: core_cm3.c * @purpose: CMSIS Cortex-M3 Core Peripheral Access Layer Source File * @version: V1.20 * @date: 22. May 2009 *-------------------------------------------------------------------------------------------------------- * * Copyright (C) 2009 ARM Limited. All rights reserved. * * ARM Limited (ARM) is supplying this software for use with Cortex-Mx * processor based microcontrollers. This file can be freely distributed * within development tools that are supporting such ARM based processors. * * 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 armcc */ #define __INLINE __inline /*!< inline keyword for armcc */ #elif defined ( __ICCARM__ ) #define __ASM __ asm /*!< asm keyword for iarcc */ #define __INLINE inline /*!< inline keyword for iarcc. */ /* Only avaiable in High */ /* optimization mode! */ #elif defined ( __GNUC__ ) #define __ASM _asm /*!< asm keyword for gcc */ #define __INLINE inline /*!< inline keyword for gcc */ #elif defined ( __TASKING__ ) #define __ASM __asm /*!< asm keyword for TASKING */ /*Compiler */ #define __INLINE inline /*!< inline keyword for TASKING */ /* Compiler */ #endif #if defined ( __CC_ARM ) /*---------------------------------RealView Compiler ---------------------------------------------------*/ /********************************************************************************************************* * @brief Return the Process Stack Pointer * * @param none * @return uint32_t 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 uint32_t Process Stack Pointer * @return none * * 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 * * @param none * @return uint32_t 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 uint32_t Main Stack Pointer * @return none * * 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 uint16_t value to reverse * @return uint32_t 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 int16_t value to reverse * @return int32_t 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 * * @param none * @return none * * Removes the exclusive lock which is created by ldrex. *********************************************************************************************************/ __ASM void __CLREX(void) { clrex } /********************************************************************************************************** * @brief Return the Base Priority value * * @param none * @return uint32_t 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 uint32_t BasePriority * @return none * * Set the base priority register *********************************************************************************************************/ __ASM void __set_BASEPRI(uint32_t basePri) { msr basepri, r0 bx lr } /********************************************************************************************************** * @brief Return the Priority Mask value * * @param none * @return uint32_t PriMask * * Return the 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 uint32_t PriMask * @return none * * Set the priority mask bit in the priority mask register *********************************************************************************************************/ __ASM void __set_PRIMASK(uint32_t priMask) { msr primask, r0 bx lr } /**