單片機(jī)型號：STM32F070F6P6

本文介紹應(yīng)用C語言進(jìn)行單片機(jī)內(nèi)部Flash的讀寫技巧，將從查看文檔開始，到最終完成完整的程序。

單片機(jī)型號：STM32F070F6P6

步驟如下：

1、查看文檔《STM32F030x4/x6/x8/xC and STM32F070x6/xB advanced ARM?-based 32-bit MCUs》確認(rèn)其Flash的內(nèi)部結(jié)構(gòu)。

2、查看文檔確認(rèn)STM32F070F6P6內(nèi)部存儲器地址分配。從下表中得到的主要信息是Main Flash memory的起始地址是0x08000000，長度是32KB，到0x08017FFF結(jié)束（結(jié)束值可不關(guān)心）。

3、繼續(xù)查看Main Flash memory的內(nèi)部結(jié)構(gòu)，如下表所示。從此表可以看出其內(nèi)部Flash按1Kbyte進(jìn)行分頁，由于STM32F070F6P6為32KB，所以一共分成32頁，分別為Page0-Page31。這個也與Keil的內(nèi)部設(shè)置是相吻合的，見下圖。

4、建立Flash地址列表，加入如下程序，這些程序參照文檔自己手動完成，在使用時，盡量靠后使用，以免和自身程序所占用的Flash空間重疊。

#define ADDR_FLASH_PAGE_0     ((uint32_t)0x08000000) /* Base @ of Page 0, 1 Kbytes */

#define ADDR_FLASH_PAGE_1     ((uint32_t)0x08000400) /* Base @ of Page 1, 1 Kbytes */

#define ADDR_FLASH_PAGE_2     ((uint32_t)0x08000800) /* Base @ of Page 2, 1 Kbytes */

#define ADDR_FLASH_PAGE_3     ((uint32_t)0x08000C00) /* Base @ of Page 3, 1 Kbytes */

#define ADDR_FLASH_PAGE_4     ((uint32_t)0x08001000) /* Base @ of Page 4, 1 Kbytes */

#define ADDR_FLASH_PAGE_5     ((uint32_t)0x08001400) /* Base @ of Page 5, 1 Kbytes */

#define ADDR_FLASH_PAGE_6     ((uint32_t)0x08001800) /* Base @ of Page 6, 1 Kbytes */

#define ADDR_FLASH_PAGE_7     ((uint32_t)0x08001C00) /* Base @ of Page 7, 1 Kbytes */

#define ADDR_FLASH_PAGE_8     ((uint32_t)0x08002000) /* Base @ of Page 8, 1 Kbytes */

#define ADDR_FLASH_PAGE_9     ((uint32_t)0x08002400) /* Base @ of Page 9, 1 Kbytes */

#define ADDR_FLASH_PAGE_10    ((uint32_t)0x08002800) /* Base @ of Page 10, 1 Kbytes */

#define ADDR_FLASH_PAGE_11    ((uint32_t)0x08002C00) /* Base @ of Page 11, 1 Kbytes */

#define ADDR_FLASH_PAGE_12    ((uint32_t)0x08003000) /* Base @ of Page 12, 1 Kbytes */

#define ADDR_FLASH_PAGE_13    ((uint32_t)0x08003400) /* Base @ of Page 13, 1 Kbytes */

#define ADDR_FLASH_PAGE_14    ((uint32_t)0x08003800) /* Base @ of Page 14, 1 Kbytes */

#define ADDR_FLASH_PAGE_15    ((uint32_t)0x08003C00) /* Base @ of Page 15, 1 Kbytes */

#define ADDR_FLASH_PAGE_16    ((uint32_t)0x08004000) /* Base @ of Page 16, 1 Kbytes */

#define ADDR_FLASH_PAGE_17    ((uint32_t)0x08004400) /* Base @ of Page 17, 1 Kbytes */

#define ADDR_FLASH_PAGE_18    ((uint32_t)0x08004800) /* Base @ of Page 18, 1 Kbytes */

#define ADDR_FLASH_PAGE_19    ((uint32_t)0x08004C00) /* Base @ of Page 19, 1 Kbytes */

#define ADDR_FLASH_PAGE_20    ((uint32_t)0x08005000) /* Base @ of Page 20, 1 Kbytes */

#define ADDR_FLASH_PAGE_21    ((uint32_t)0x08005400) /* Base @ of Page 21, 1 Kbytes */

#define ADDR_FLASH_PAGE_22    ((uint32_t)0x08005800) /* Base @ of Page 22, 1 Kbytes */

#define ADDR_FLASH_PAGE_23    ((uint32_t)0x08005C00) /* Base @ of Page 23, 1 Kbytes */

#define ADDR_FLASH_PAGE_24    ((uint32_t)0x08006000) /* Base @ of Page 24, 1 Kbytes */

#define ADDR_FLASH_PAGE_25    ((uint32_t)0x08006400) /* Base @ of Page 25, 1 Kbytes */

#define ADDR_FLASH_PAGE_26    ((uint32_t)0x08006800) /* Base @ of Page 26, 1 Kbytes */

#define ADDR_FLASH_PAGE_27    ((uint32_t)0x08006C00) /* Base @ of Page 27, 1 Kbytes */

#define ADDR_FLASH_PAGE_28    ((uint32_t)0x08007000) /* Base @ of Page 28, 1 Kbytes */

#define ADDR_FLASH_PAGE_29    ((uint32_t)0x08007400) /* Base @ of Page 29, 1 Kbytes */

#define ADDR_FLASH_PAGE_30    ((uint32_t)0x08007800) /* Base @ of Page 30, 1 Kbytes */

#define ADDR_FLASH_PAGE_31    ((uint32_t)0x08007C00) /* Base @ of Page 31, 1 Kbytes */

6、建立CFlash類，代碼如下：

class CFlash

{

public:

    void UnLockFalsh(void);

    void LockFlash(void);

    boolean ErasePage(uint32_t u32_Page);

    boolean WriteDataToFlash(uint32_t address, uint8_t data3, uint8_t data2, uint8_t data1, uint8_t data0);

    boolean WriteDataToFlash(uint32_t address, uint16_t data1, uint16_t data0);

    boolean WriteDataToFlash(uint32_t address, uint32_t data);

    void ReadDataFromFlash(uint32_t address, uint8_t *data3, uint8_t *data2, uint8_t *data1, uint8_t *data0);

    void ReadDataFromFlash(uint32_t address, uint16_t *data1, uint16_t *data0);

    void ReadDataFromFlash(uint32_t address, uint32_t *data);

};

7、以下是上述成員函數(shù)的具體實現(xiàn)，參考使用即可。

#include "include.h"

void CFlash::UnLockFalsh(void)

{

    HAL_FLASH_Unlock();

}

void CFlash::LockFlash(void)

{

    HAL_FLASH_Lock();

}

boolean CFlash::ErasePage(uint32_t u32_Page)

{

    FLASH_EraseInitTypeDef EraseInitStruct;

    uint32_t PageError = 0;

    EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;

    EraseInitStruct.PageAddress = u32_Page;

    EraseInitStruct.NbPages = 1;

    if (HAL_FLASHEx_Erase(&EraseInitStruct, &PageError) != HAL_OK)

    {

        return TRUE;

    }

    return FALSE;

}

boolean CFlash::WriteDataToFlash(uint32_t address, uint8_t data3, uint8_t data2, uint8_t data1, uint8_t data0)

{

    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, (data3 << 24) | (data2 << 16) | (data1 << 8) | data0) != HAL_OK)

    {

        return FALSE;

    }

    return TRUE;

}

boolean CFlash::WriteDataToFlash(uint32_t address, uint16_t data1, uint16_t data0)

{

    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, (data1 << 16) |  data0) != HAL_OK)

    {

        return FALSE;

    }

    return TRUE;

}

boolean CFlash::WriteDataToFlash(uint32_t address, uint32_t data)

{

    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, data) != HAL_OK)

    {

        return FALSE;

    }

    return TRUE;

}

void CFlash::ReadDataFromFlash(uint32_t address, uint8_t *data3, uint8_t *data2, uint8_t *data1, uint8_t *data0)

{

    uint32_t u32_Data;

    u32_Data = *(__IO uint32_t *)(address);

    if (data3 != NULL)

    {

        *data3 = (u32_Data >> 24) & 0xff;

    }

    if (data2 != NULL)

    {

        *data2 = (u32_Data >> 16) & 0xff;

    }

    if (data1 != NULL)

    {

        *data1 = (u32_Data >> 8) & 0xff;

    }

    if (data0 != NULL)

    {

        *data0 = u32_Data & 0xff;

    }

}

void CFlash::ReadDataFromFlash(uint32_t address, uint16_t *data1, uint16_t *data0)

{

    uint32_t u32_Data;

    u32_Data = *(__IO uint32_t *)(address);

    *data1 = (u32_Data >> 16) & 0xffff;

    *data0 = u32_Data & 0xffff;

}

void CFlash::ReadDataFromFlash(uint32_t address, uint32_t *data)

{

    *data =  *(__IO uint32_t *)(address);

}

8、到此，就可以直接進(jìn)行Flash讀寫操作了。