STM32G0xx使用LL库将Flash页分块方式存储数据实现一次擦除可多次写入

参考例程

STM32G0xx HAL和LL库Flash读写擦除操作
STM32G030Cx HAL库Flash擦除或编程操作出错的解决办法

例程说明

1.Flash存储数据采用页分块方式，实现一次擦除多次写入，每块128Byte总共16块，当存满16块后擦除一次
2.将数据写入Flash前，需要前后对比数据，只有数据发生变化才能写入Flash中
3.从Flash读取数据后，进行CRC校验，校验不通过往前继续读取数据，然后重新校验数据
4.将数据写如Flash前需要确保改块都是0xFF，保证写入数据成功

---

一、存储到Flash中的数据

说明：

1. Header用来标识存储的头部信息，在Flash读取或写入时用到
2. ubRes用来作块对齐使用，默认进行128Byte对齐

---

#define FLASH_STORE_PARM_HEADER_TAG      (0x6C5A)                                             //固定头信息
#define FLASH_STORE_PARM_BLOCK_SIZE      (128)                                                //块大小
#define FLASH_STORE_PARM_BLOCK_COUNT     (u16)(FLASH_PAGE_SIZE / FLASH_STORE_PARM_BLOCK_SIZE) //1页分块的数量

#pragma pack(1)
typedef struct
{
   
   
    ............
    ............
}GlobalParamStore, * GlobalParamStore_t;

typedef struct
{
   
   
    ............
    ............
}DemarParamStore, * DemarParamStore_t, * pDemarParamStore;

typedef struct
{
   
   
    ............
    ............
}ExceptionTrace;

typedef struct
{
   
   
    ............
    ............
}ExtraLibPara;

typedef struct
{
   
   
    u16 HeaderTag;
    u16 StoreIndex;
}FlashStoreHeader, * FlashStoreHeader_t;

typedef struct
{
   
   
    FlashStoreHeader  Header;
    GlobalParamStore  SysPar;
    DemarParamStore   DemarPar;
    ExceptionTrace    ExpTrace;
    ExtraLibPara      ExtLibPar;

    u8 ubRes[16];
    u8 ubCRC8; 
}SystemParamStore, * SystemParamStore_t;
#pragma pack()

二、Flash最底层操作(解锁，加锁，擦除，读写)

说明：

1. XSUPER_STM32G0_LL_LIB_ENABLE 被使能使用LL库
2. Flash相关操作失败可多次尝试，尽可能让操作成功

---

#define FLASH_OPT_OVERTIMER         										(0x1FFFF)
#define FLASH_OPT_TRY_COUNT         										(5)


/* Unlock the FLASH control register access */
static u8 ubFLASH_Unlock(void)
{
   
   
    u8 sta = 0;

    if (READ_BIT(FLASH->CR, FLASH_CR_LOCK) != 0x00U)
    {
   
   
        /* Authorize the FLASH Registers access */
        WRITE_REG(FLASH->KEYR, FLASH_KEY1);
        WRITE_REG(FLASH->KEYR, FLASH_KEY2);

        /* verify Flash is unlock */
        if (READ_BIT(FLASH->CR, FLASH_CR_LOCK) != 0x00U)
        {
   
   
            sta = 1;
        }
    }

    return sta;	
}


/* Lock the FLASH control register access */
static u8 ubFLASH_Lock(void)
{
   
   
    u8 sta = 1;

    /* Set the LOCK Bit to lock the FLASH Registers access */
    SET_BIT(FLASH->CR, FLASH_CR_LOCK);

    /* verify Flash is locked */
    if (READ_BIT(FLASH->CR, FLASH_CR_LOCK) != 0x00u)
    {
   
   
        sta = 0;
    }

    return sta;
}


/* Gets the page of a given address */
static u32 ulGetPage(u32 startAddr)
{
   
   
    return ((startAddr - FLASH_BASE) / FLASH_PAGE_SIZE);
}


/* Erase the specified FLASH memory page */
static u8 ubFLASH_PageErase(u32 page)
{
   
   
    u32 tmp  = 0;
    u32 time = 0;
    u8  res  = 0;

    /* Get configuration register, then clear page number */
    tmp = (FLASH->CR & ~FLASH_CR_PNB);

    /* Set page number, Page Erase bit & Start bit */
    FLASH->CR = (tmp | (FLASH_CR_STRT | (page <<  FLASH_CR_PNB_Pos) | FLASH_