Flash地址空间的数据读取

创建工程

打开STM32CubeMX，创建一个工程

配置定时器

?引脚配置

中断配置，将下面红线勾画的15改为0

调整堆栈大，将栈大小设为大于2k,因为本案例操作flash会用到：

?配置时钟

?之后点击创建工程即可。

修改工程

打开刚刚创建的工程文件

再此处添加一个flash.c文件。代码如下

/*
 * flash.c
 *
 * Created: 2018-01-29
 * Author: zhanglifu
 */
 
/*********************************************************************/
//                        í·???t
/*********************************************************************/
#include "flash.h"


// 2??ì2éμ?D′è?
// WriteAddr:?eê?μ??·
// pBuffer:  êy?Y????
// NumToWrite:×??úêyêy
void FlashWriteNoCheck( uint32_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite )
{
    uint16_t i;

    for( i=0; i<NumToWrite; i+=4 )
    {
        while( HAL_OK != HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, WriteAddr+i,*(uint32_t *)(pBuffer+i) ) );
    }

}

extern void FLASH_PageErase(uint32_t PageAddress);
void FlashWriteBuff( const uint32_t destination_address, uint8_t *const buffer,uint32_t length )
{
    uint16_t i;
    uint8_t FlashBuff[FMC_SECTOR_SIZE];
    uint32_t StartAddress = destination_address - destination_address%FMC_SECTOR_SIZE;
    uint16_t Offset = destination_address - StartAddress;
    uint8_t *pBuf = buffer;
    uint32_t remaindNum = length;

    HAL_StatusTypeDef status = HAL_ERROR;

    // μ??·?ì2é
    if( (destination_address < FMC_FLASH_BASE) || ( destination_address + length >= FMC_FLASH_END) || (length <= 0) )
        return;

    HAL_FLASH_Unlock();	// ?a??
    do
    {
        // ?á3?ò?ò3êy?Y
        for(i=0; i < FMC_SECTOR_SIZE; i += 4 )
            *(uint32_t *)(FlashBuff+i) = *(uint32_t *)(StartAddress+i);

        // DT??òa??è?μ?êy?Y
        for ( i=0; (i+Offset)<FMC_SECTOR_SIZE && i< remaindNum; i++ )
            *(FlashBuff+Offset+i) = *(pBuf+i);


        // 2á3yò?ROWêy?Y
        FLASH_PageErase( StartAddress );

        // HAL?a FLASH_PageEraseóDBUFF,òa?óé?????èyDD′ú??
        while( status != HAL_OK )
            status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
        CLEAR_BIT(FLASH->CR, FLASH_CR_PER);

        // D′è?êy?Y
        FlashWriteNoCheck( StartAddress,FlashBuff,FMC_SECTOR_SIZE );

        // ?a??ò?ò3×?×?±?
        StartAddress +=  FMC_SECTOR_SIZE;
        remaindNum -= i;
        pBuf += i;
        Offset = 0;

    } while( remaindNum > 0 );

    HAL_FLASH_Lock();  // é???
		
}



// ′óFLASH?D?á???¨3¤?èêy?Y
void FlashReadBuff(const uint32_t source_address,uint8_t *const buffer,uint16_t length)
{
    uint16_t i;
    uint8_t Offset = 0;
    uint32_t StartAddress = source_address;
    uint16_t data;

    // μ??·?ì2a
    if( source_address + length > FMC_FLASH_END ) return;

    // è?1???óD??16??
    if( source_address & 1 )
    {
        Offset = 1;
        StartAddress = source_address-1;
    }

    // flashμ?2ù×÷òa?ó16???? ×?D??áD′2ù×÷16??±èì?
    if ( Offset )
    {
        data = *(uint16_t *)(StartAddress);
        buffer[0] = data >> 8;
        StartAddress += 2;
    }

    for ( i = 0; i < (length-Offset); i += 2)
    {
        data = *(uint16_t *)(StartAddress+i);
        buffer[i+Offset] = (data & 0xFF);
        if ( (i+Offset) < (length - 1) )
            buffer[i + Offset + 1] = (data >> 8);
    }

}

再在INC文件了添加一个flash.h文件，flash.h可在下面的链接中提取。

?链接：https://pan.baidu.com/s/1dn5vGVMufnqcsyRVrIvKsg?
提取码：jack

添加代码

在main.c添加如下代码

此处添加?#include "flash.h"

此处添加uint8_t FlashWBuff[255];
uint8_t FlashRBuff[255];

此处添加? ?uint8_t i;
?? ? uint8_t FlashTest[]="Hello This is 631907030411 lan Flash Test";

?此处添加?? ?FlashWriteBuff( DEVICE_INFO_ADDRESS, FlashTest,sizeof(FlashTest) ); ? ? ? ?// D′è?êy?Yμ?Flash
?? ?
?? ?for(i=0;i<255;i++)
?? ??? ?FlashWBuff[i] = i;
?? ?
? FlashWriteBuff( DEVICE_INFO_ADDRESS + sizeof(FlashTest), FlashWBuff,255 ); ?// D′è?êy?Yμ?Flash
?? ?FlashReadBuff( ?DEVICE_INFO_ADDRESS + sizeof(FlashTest),FlashRBuff,255 ?); ?// ′óFlash?D?áè?êy