stm32f10x_flash.zip_stm32 flash_stm32 flash

/******************** (C) COPYRIGHT 2008 STMicroelectronics ******************** * File Name : stm32f10x_flash.c * Author : MCD Application Team * Version : V2.0.2 * Date : 07/11/2008 * Description : This file provides all the FLASH firmware functions. ******************************************************************************** * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE * CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "stm32f10x_flash.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Flash Access Control Register bits */ #define ACR_LATENCY_Mask ((u32)0x00000038) #define ACR_HLFCYA_Mask ((u32)0xFFFFFFF7) #define ACR_PRFTBE_Mask ((u32)0xFFFFFFEF) #ifdef _FLASH_PROG /* Flash Access Control Register bits */ #define ACR_PRFTBS_Mask ((u32)0x00000020) /* Flash Control Register bits */ #define CR_PG_Set ((u32)0x00000001) #define CR_PG_Reset ((u32)0x00001FFE) #define CR_PER_Set ((u32)0x00000002) #define CR_PER_Reset ((u32)0x00001FFD) #define CR_MER_Set ((u32)0x00000004) #define CR_MER_Reset ((u32)0x00001FFB) #define CR_OPTPG_Set ((u32)0x00000010) #define CR_OPTPG_Reset ((u32)0x00001FEF) #define CR_OPTER_Set ((u32)0x00000020) #define CR_OPTER_Reset ((u32)0x00001FDF) #define CR_STRT_Set ((u32)0x00000040) #define CR_LOCK_Set ((u32)0x00000080) /* FLASH Mask */ #define RDPRT_Mask ((u32)0x00000002) #define WRP0_Mask ((u32)0x000000FF) #define WRP1_Mask ((u32)0x0000FF00) #define WRP2_Mask ((u32)0x00FF0000) #define WRP3_Mask ((u32)0xFF000000) /* FLASH Keys */ #define RDP_Key ((u16)0x00A5) #define FLASH_KEY1 ((u32)0x45670123) #define FLASH_KEY2 ((u32)0xCDEF89AB) /* Delay definition */ #define EraseTimeout ((u32)0x00000FFF) #define ProgramTimeout ((u32)0x0000000F) #endif /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ #ifdef _FLASH_PROG static void delay(void); #endif /* Private functions ---------------------------------------------------------*/ /******************************************************************************* * Function Name : FLASH_SetLatency * Description : Sets the code latency value. * Input : - FLASH_Latency: specifies the FLASH Latency value. * This parameter can be one of the following values: * - FLASH_Latency_0: FLASH Zero Latency cycle * - FLASH_Latency_1: FLASH One Latency cycle * - FLASH_Latency_2: FLASH Two Latency cycles * Output : None * Return : None * 中文说明 :这些位表示SYSCLK(系统时钟)周期与闪存访问时间的比例 *******************************************************************************/ void FLASH_SetLatency(u32 FLASH_Latency) { /* Check the parameters */ assert_param(IS_FLASH_LATENCY(FLASH_Latency)); /* Sets the Latency value */ FLASH->ACR &= ACR_LATENCY_Mask; FLASH->ACR |= FLASH_Latency; } /******************************************************************************* * Function Name : FLASH_HalfCycleAccessCmd * Description : Enables or disables the Half cycle flash access. * Input : - FLASH_HalfCycle: specifies the FLASH Half cycle Access mode. * This parameter can be one of the following values: * - FLASH_HalfCycleAccess_Enable: FLASH Half Cycle Enable * - FLASH_HalfCycleAccess_Disable: FLASH Half Cycle Disable * Output : None * Return : None *******************************************************************************/ void FLASH_HalfCycleAccessCmd(u32 FLASH_HalfCycleAccess) { /* Check the parameters */ assert_param(IS_FLASH_HALFCYCLEACCESS_STATE(FLASH_HalfCycleAccess)); /* Enable or disable the Half cycle access */ FLASH->ACR &= ACR_HLFCYA_Mask; FLASH->ACR |= FLASH_HalfCycleAccess; } /******************************************************************************* * Function Name : FLASH_PrefetchBufferCmd * Description : Enables or disables the Prefetch Buffer. * Input : - FLASH_PrefetchBuffer: specifies the Prefetch buffer status. * This parameter can be one of the following values: * - FLASH_PrefetchBuffer_Enable: FLASH Prefetch Buffer Enable * - FLASH_PrefetchBuffer_Disable: FLASH Prefetch Buffer Disable * Output : None * Return : None * 中文功能说明 :设置预取缓冲器可以使CPU更快地执行，CPU读取一个字的同时下一个字已经在预取缓冲器中 * 等候，即当代码跳转的边界为8字节的倍数时，闪存的加速比例为2。 *******************************************************************************/ void FLASH_PrefetchBufferCmd(u32 FLASH_PrefetchBuffer) { /* Check the parameters */ assert_param(IS_FLASH_PREFETCHBUFFER_STATE(FLASH_PrefetchBuffer)); /* Enable or disable the Prefetch Buffer */ FLASH->ACR &= ACR_PRFTBE_Mask; FLASH->ACR |= FLASH_PrefetchBuffer; } #ifdef _FLASH_PROG /******************************************************************************* * Function Name : FLASH_Unlock * Description : Unlocks the FLASH Program Erase Controller. * Input : None * Output : None * Return : None *******************************************************************************/ void FLASH_Unlock(void) { /* Authorize the FPEC Access */ FLASH->KEYR = FLASH_KEY1; FLASH->KEYR = FLASH_KEY2; } /******************************************************************************* * Function Name : FLASH_Lock * Description : Locks the FLASH Program Erase Controller. * Input : None * Output : None * Return : None *******************************************************************************/ void FLASH_Lock(void) { /* Set the Lock Bit to lock the FPEC and the FCR */ FLASH->CR |= CR_LOCK_Set; } /******************************************************************************* * Function Name : FLASH_ErasePage * Description : Erases a specified FLASH page. * Input : - Page_Address: The page address to be erased. * Output : None * Return : FLASH Status: The returned value can be: FLASH_BUSY, * FLASH_ERROR_PG, FLASH_ERROR_WRP, FLASH_COMPLETE or * FLASH_TIMEOUT. *******************************************************************************/ FLASH_Status FLASH_ErasePage(u32 Page_Address) { FLASH_Status status = FLASH_COMPLETE; /* Check the parameters */ assert_param(IS_FLASH_ADDRESS(Page_Address)); /* Wait for last operation to be completed */ status = FLASH_WaitForLastOperation(EraseTimeout); if(status == FLASH_COMPLETE) { /* if the previous operation is complet