STM32G0xx HAL和LL库Flash读写擦除操作

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已于 2022-10-11 14:24:30 修改 · 5.9k 阅读

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#stm32 #单片机 #arm #嵌入式硬件

于 2022-10-11 14:20:29 首次发布

本文介绍STM32G0xx系列微控制器中Flash的读写及擦除操作，包括使用HAL库和LL库进行解锁、擦除页面、双字写入等关键步骤，并通过实际测试验证其正确性。

STM32G0xx HAL和LL库Flash读写擦除操作

例程说明
宏定义说明
Flash解锁与加锁
Flash选项字节解锁与加锁
Flash擦除页
Flash忙等待
Flash双字写入
Flash LL库双字写
Flash HAL库双字写
Flash双字读
Flash读写擦除测试
测试情况

例程说明

STM32G0xx在对Flash操作时，有时会出现HardFault异常、或者出现擦除、写入失败的情况，故有此记录。
STM32G0xx LL库官方没有提供Flash相关的操作需要自己写，可借鉴HAL库。

宏定义说明


#define XMEM_ALIGN_SIZE(size , align)                                        (((size) + (align) - 1) / (align))

/* 获取成员m在结构体t中的偏移位置 */
#define XOFS(t , m)                                                         ((u32)(&(((t *)0)->m)))

#define SYSTEM_ARG_STORE_START_ADDRE                                        (0x0800F800UL)

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

Flash解锁与加锁

/* 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;
}

Flash选项字节解锁与加锁

/* Unlock the FLASH Option Bytes Registers access */
static u8 ubFLASH_OB_Unlock(void)
{
   
   
    u8 sta = 1;

    if (READ_BIT(FLASH->CR, FLASH_CR_OPTLOCK) != 0x00U)
    {
   
   
        /* Authorizes the Option Byte register programming */
        WRITE_REG(FLASH->OPTKEYR, FLASH_OPTKEY1);
        WRITE_REG(FLASH->OPTKEYR, FLASH_OPTKEY2);

        /* verify option bytes are unlocked */
        if (READ_BIT(FLASH->CR, FLASH_CR_OPTLOCK) == 0x00U)
        {
   
   
            sta = 0;
        }
    }

    return sta;
}


/* Lock the FLASH Option Bytes Registers access */
static u8 ubFLASH_OB_Lock(void)
{
   
   
    u8 sta = 1;

    /* Set the OPTLOCK Bit to lock the FLASH Option Byte Registers access */
    SET_BIT(FLASH->CR, FLASH_CR_OPTLOCK);

    /* verify option bytes are locked */
    if (READ_BIT(FLASH->CR, FLASH_CR_OPTLOCK) != 0x00u)
    {
   
   
        sta = 0;
    }

    return sta;
}

Flash擦除页

/* 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_CR_PER));

    /* wait for BSY1 in order to be sure that flash operation is ended before allowing prefetch in flash */
    while ((FLASH->SR & FLASH_SR_BSY1) != 0x00U)
    {
   
   
        if ((++tim

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