I2C.zip_I2C嵌入式

/****************************************************************************** * @file: core_cm0.c * @purpose: CMSIS Cortex-M0 Core Peripheral Access Layer Source File * @version: V1.0 * @date: 12. Nov. 2008 *---------------------------------------------------------------------------- * * Copyright (C) 2008 ARM Limited. All rights reserved. * * ARM Limited (ARM) is supplying this software for use with Cortex-M0 * 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! */ #define __nop __no_operation /*!< no operation intrinsic in iarcc */ #elif defined ( __GNUC__ ) #define __ASM asm /*!< asm keyword for gcc */ #define __INLINE inline /*!< inline keyword for gcc */ #endif #if (defined (__ARMCC_VERSION)) && (__ARMCC_VERSION < 400000) /** * @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 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 } /** * @brief Return the Fault Mask value * * @param none * @return uint32_t 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 uint32_t faultMask value * @return none * * Set the fault mask register */ __ASM void __set_FAULTMASK(uint32_t faultMask) { msr faultmask, r0 bx lr } /** * @brief Return the Control Register value * * @param none * @return uint32_t 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 uint32_t Control value * @return none * * Set the control register */ __ASM void __set_CONTROL(uint32_t control) { msr control, 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 } #elif (defined (__ICCARM__)) #pragma diag_suppress=Pe940 /** * @brief Return the Process Stack Pointer * * @param none * @return uint32_t 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 uint32_t Process Stack Pointer * @return none * * 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 * * @param none * @return uint32_t 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 uint32_t Main Stack Pointer * @return none * * 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 uint16_t value to reverse * @return uint32_t 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 uint32_t value to reverse * @return uint32_t reversed value * * Reverse bit order of value */ uint32_t __RBIT(uint32_t value) { __ASM("rbit r0, r0"); __ASM("bx lr"); } /** * @brief LDR Exclusive * * @param uint8_t* address * @return uint8_t value of (*address) * * Exclusive LDR command */ uint8_t __LDREXB(uint8_t *addr) { __ASM("ldrexb r0, [r0]"); __ASM("bx lr"); } /** * @brief LDR Exclusive * * @param uint16_t* address * @return uint16_t value of (*address) * * Exclusive LDR command */ uint16_t __LDREXH(uint16_t *addr) { __ASM("ldrexh r0, [r0]"); __ASM("bx lr"); } /** * @brief LDR Exclusive * * @param uint32_t* address * @return uint32_t value of (*address) * * Exclusive LDR command */ uint32_t __LDREXW(uint32_t *addr) { __ASM("ldrex r0, [r0]"); __ASM("bx lr"); } /** * @brief STR Exclusive