[原创] ST NUCLEO-C031C6开发板学习笔记08（FLASH读写）

qzc0927 2024-3-5 17:57 楼主

## 11：FLASH读写

### 11.1：硬件设计

先看数据手册说明：

![image-20240305174518991](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305174518991.png)

FLASH空间大小为32KB。

在看下FLASH的特性：

![image-20240305174637960](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305174637960.png)

### 11.2：软件设计

读写FLASH操作步骤

（1）写数据操作
1.解除写保护

```C
HAL_FLASH_Unlock();
```

2.清除状态位，确认未在执行任何FLASH操作，

```C
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
```

3.擦除扇区HAL_FLASHEx_Erase

```C
HAL_FLASHEx_Erase(&EraseInitStruct, &PageError)
```

4.写入双字64位数据

```C
HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, Address, DATA_64)
```

5.锁定写保护

```
 HAL_FLASH_Lock();
```

（2）读数据操作
直接读取地址数据即可。

```C
data32 = *(__IO uint32_t *)Address;
```

具体实现代码为：

首先设置FLASH空间地址：

```C
#define ADDR_FLASH_PAGE_0 ((uint32_t)0x08000000) /* Base @ of Page 0, 2 Kbytes */
#define ADDR_FLASH_PAGE_1 ((uint32_t)0x08000800) /* Base @ of Page 1, 2 Kbytes */
#define ADDR_FLASH_PAGE_2 ((uint32_t)0x08001000) /* Base @ of Page 2, 2 Kbytes */
#define ADDR_FLASH_PAGE_3 ((uint32_t)0x08001800) /* Base @ of Page 3, 2 Kbytes */
#define ADDR_FLASH_PAGE_4 ((uint32_t)0x08002000) /* Base @ of Page 4, 2 Kbytes */
#define ADDR_FLASH_PAGE_5 ((uint32_t)0x08002800) /* Base @ of Page 5, 2 Kbytes */
#define ADDR_FLASH_PAGE_6 ((uint32_t)0x08003000) /* Base @ of Page 6, 2 Kbytes */
#define ADDR_FLASH_PAGE_7 ((uint32_t)0x08003800) /* Base @ of Page 7, 2 Kbytes */
#define ADDR_FLASH_PAGE_8 ((uint32_t)0x08004000) /* Base @ of Page 8, 2 Kbytes */
#define ADDR_FLASH_PAGE_9 ((uint32_t)0x08004800) /* Base @ of Page 9, 2 Kbytes */
#define ADDR_FLASH_PAGE_10  ((uint32_t)0x08005000) /* Base @ of Page 10, 2 Kbytes */
#define ADDR_FLASH_PAGE_11  ((uint32_t)0x08005800) /* Base @ of Page 11, 2 Kbytes */
#define ADDR_FLASH_PAGE_12  ((uint32_t)0x08006000) /* Base @ of Page 12, 2 Kbytes */
#define ADDR_FLASH_PAGE_13  ((uint32_t)0x08006800) /* Base @ of Page 13, 2 Kbytes */
#define ADDR_FLASH_PAGE_14  ((uint32_t)0x08007000) /* Base @ of Page 14, 2 Kbytes */
#define ADDR_FLASH_PAGE_15  ((uint32_t)0x08007800) /* Base @ of Page 15, 2 Kbytes */
```

编写FLASH读写函数

```C
void Flash_WR_Task(void)
{

HAL_FLASH_Unlock();

/* Clear OPTVERR bit set on virgin samples */
  __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);

/* Erase the user Flash area
  (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/

/* Get the 1st page to erase */
  FirstPage = GetPage(FLASH_USER_START_ADDR);

/* Get the number of pages to erase from 1st page */
  NbOfPages = GetPage(FLASH_USER_END_ADDR) - FirstPage + 1;

/* Fill EraseInit structure*/
  EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
  EraseInitStruct.Page  = FirstPage;
  EraseInitStruct.NbPages = NbOfPages;
  if (HAL_FLASHEx_Erase(&EraseInitStruct, &PageError) != HAL_OK)
  {
  /*如果擦除失败，就一直再闪烁LED*/
  while (1)
  {
    HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5);
    HAL_Delay(500);
  }
  }

Address = FLASH_USER_START_ADDR;

while (Address < FLASH_USER_END_ADDR)
  {
  if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, Address, DATA_64) == HAL_OK)
  {
    Address = Address + 8;
  }
  }

HAL_FLASH_Lock();
  DEBUG_LOG("Flash写入数据成功");

Address = FLASH_USER_START_ADDR;
  MemoryProgramStatus = 0x0;

while (Address < FLASH_USER_END_ADDR)
  {
  data32 = *(__IO uint32_t *)Address;

if (data32 != DATA_32)
  {
    MemoryProgramStatus++;

}
  Address = Address + 4;
  DEBUG_LOG("%08x",data32);
  }

}
```

### 11.3：FLASH读写单元测试

将FLASH的最后两页不断写入0x11223344，然后读取数据。

![image-20240305175440799](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305175440799.png)

写入成功。

![image-20240305175537978](https://boreyun.oss-cn-shanghai.aliyuncs.com/image-20240305175537978.png)

读取成功。