STM32L431内部flash读写 完整示例代码

以下是一个简单的STM32L431内部Flash读写的示例代码：

#include "stm32l4xx_hal.h"

#define FLASH_USER_START_ADDR   ADDR_FLASH_PAGE_62   /* Start @ of user Flash area */
#define FLASH_USER_END_ADDR     ADDR_FLASH_PAGE_127 + FLASH_PAGE_SIZE - 1   /* End @ of user Flash area */
#define DATA_32                 ((uint32_t)0x12345678)

/* Private variables ---------------------------------------------------------*/
FLASH_EraseInitTypeDef EraseInitStruct;
uint32_t PAGEError = 0;
HAL_StatusTypeDef FlashStatus = HAL_OK;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_FLASH_Init(void);

int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_FLASH_Init();

  /* Unlock the Flash to enable the flash control register access *************/
  HAL_FLASH_Unlock();

  /* Erase the user Flash area ************************************************/
  EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
  EraseInitStruct.PageAddress = FLASH_USER_START_ADDR;
  EraseInitStruct.NbPages = (FLASH_USER_END_ADDR - FLASH_USER_START_ADDR) / FLASH_PAGE_SIZE;
  if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
  {
    /*
      Error occurred while page erase.
      User can add here some code to deal with this error.
      PAGEError will contain the faulty page and then to know the code error on this page,
      user can call function 'HAL_FLASH_GetError()'
    */
    while (1)
    {
    }
  }

  /* Program the user Flash area word by word *********************************/
  uint32_t Address = FLASH_USER_START_ADDR;
  while (Address < FLASH_USER_END_ADDR)
  {
    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, Address, DATA_32) == HAL_OK)
    {
      Address = Address + 4;
    }
    else
    {
      /*
        Error occurred while writing data in Flash memory.
        User can add here some code to deal with this error.
        FLASH_ErrorTypeDef errorcode = HAL_FLASH_GetError();
      */
      while (1)
      {
      }
    }
  }

  /* Lock the Flash to disable the flash control register access (recommended
     to protect the FLASH memory against possible unwanted operation) *********/
  HAL_FLASH_Lock();

  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Supply configuration update enable
  */
  HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  while (!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY))
  {
  }
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief FLASH Initialization Function
  * @param None
  * @retval None
  */
static void MX_FLASH_Init(void)
{
  /* FLASH initialization */
  FLASH_EraseInitTypeDef EraseInitStruct;
  uint32_t PAGEError = 0;
  HAL_FLASH_Unlock();
  EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;
  EraseInitStruct.PageAddress = FLASH_USER_START_ADDR;
  EraseInitStruct.NbPages     = (FLASH_USER_END_ADDR - FLASH_USER_START_ADDR) / FLASH_PAGE_SIZE;
  HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError);
  HAL_FLASH_Lock();
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);

  /*Configure GPIO pin : PA5 */
  GPIO_InitStruct.Pin = GPIO_PIN_5;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

该示例代码首先初始化了系统时钟, GPIO 和 Flash。然后解锁Flash，删除用户区域中的旧数据，然后逐个单词编程Flash。最后，锁定Flash以保护其免受未经授权的访问。

需要注意的是，该示例代码只支持对Flash中用户区域的编程，不支持对芯片内部的其他Flash区域的编程。另外，该代码仅用于演示目的，实际应用中需要根据具体需求进行修改。