text: /**
    ******************************************************************************
    * @file    FLASH/FLASH_EraseProgram/Src/main.c
    * @author  MCD Application Team
    * @brief   This example provides a description of how to erase and program the
    *          STM32L0xx FLASH.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  
  /** @addtogroup STM32L0xx_HAL_Examples
    * @{
    */
  
  /** @addtogroup FLASH_EraseProgram
    * @{
    */
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  #define FLASH_USER_START_ADDR   (FLASH_BASE + FLASH_PAGE_SIZE * 256)             /* Start @ of user Flash area */
  #define FLASH_USER_END_ADDR     (FLASH_USER_START_ADDR + FLASH_PAGE_SIZE * 10)   /* End @ of user Flash area */
  
  #define DATA_32                 ((uint32_t)0x12345678)
  
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  uint32_t Address = 0, PAGEError = 0;
  __IO uint32_t data32 = 0 , MemoryProgramStatus = 0;
  
  /*Variable used for Erase procedure*/
  static FLASH_EraseInitTypeDef EraseInitStruct;
  
  /* Private function prototypes -----------------------------------------------*/
  void SystemClock_Config(void);
  
  /* Private functions ---------------------------------------------------------*/
  
  /**
    * @brief  Main program
    * @param  None
    * @retval None
    */
  int main(void)
  {
    /* STM32L0xx HAL library initialization:
         - Configure the Flash prefetch, Flash preread and Buffer caches
         - Systick timer is configured by default as source of time base, but user 
               can eventually implement his proper time base source (a general purpose 
               timer for example or other time source), keeping in mind that Time base 
               duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
               handled in milliseconds basis.
         - Low Level Initialization
       */
    HAL_Init();
  
    /* Configure the system clock to 2 MHz */
    SystemClock_Config();
  
    /* Initialize LED2 */
    BSP_LED_Init(LED2);
  
    /* Unlock the Flash to enable the flash control register access *************/
    HAL_FLASH_Unlock();
  
    /* Erase the user Flash area
      (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/
  
    /* Fill EraseInit structure*/
    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()'
      */
      /* Infinite loop */
      while (1)
      {
        /* Make LED2 blink (100ms on, 2s off) to indicate error in Erase operation */
        BSP_LED_On(LED2);
        HAL_Delay(100);
        BSP_LED_Off(LED2);
        HAL_Delay(2000);
      }
    }
  
    /* Program the user Flash area word by word
      (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/
  
    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 */
        while (1)
        {
          /* Make LED2 blink (100ms on, 2s off) to indicate error in Write operation */
          BSP_LED_On(LED2);
          HAL_Delay(100);
          BSP_LED_Off(LED2);
          HAL_Delay(2000);
        }
      }
    }
  
    /* Lock the Flash to disable the flash control register access (recommended
       to protect the FLASH memory against possible unwanted operation) *********/
    HAL_FLASH_Lock();
  
    /* Check if the programmed data is OK
        MemoryProgramStatus = 0: data programmed correctly
        MemoryProgramStatus != 0: number of words not programmed correctly ******/
    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;
    }
  
    /*Check if there is an issue to program data*/
    if (MemoryProgramStatus == 0)
    {
      /* No error detected. Switch on LED2*/
      BSP_LED_On(LED2);
    }
    else
    {
      /* Error detected. LED2 will blink with 1s period */
      while (1)
      {
        BSP_LED_On(LED2);
        HAL_Delay(1000);
        BSP_LED_Off(LED2);
        HAL_Delay(1000);
      }
    }
  
    /* Infinite loop */
    while (1)
    {
    }
  }
  
  /**
    * @brief  System Clock Configuration
    *         The system Clock is configured as follow : 
    *            System Clock source            = MSI
    *            SYSCLK(Hz)                     = 2000000
    *            HCLK(Hz)                       = 2000000
    *            AHB Prescaler                  = 1
    *            APB1 Prescaler                 = 1
    *            APB2 Prescaler                 = 1
    *            Flash Latency(WS)              = 0
    *            Main regulator output voltage  = Scale3 mode
    * @retval None
    */
  void SystemClock_Config(void)
  {
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    
    /* Enable MSI Oscillator */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
    RCC_OscInitStruct.MSICalibrationValue=0x00;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
    {
      /* Initialization Error */
      while(1); 
    }
    
    /* Select MSI as system clock source and configure the HCLK, PCLK1 and PCLK2 
       clocks dividers */
    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
    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_0)!= HAL_OK)
    {
      /* Initialization Error */
      while(1); 
    }
    /* Enable Power Control clock */
    __HAL_RCC_PWR_CLK_ENABLE();
    
    /* The voltage scaling allows optimizing the power consumption when the device is 
       clocked below the maximum system frequency, to update the voltage scaling value 
       regarding system frequency refer to product datasheet.  */
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
    
    /* Disable Power Control clock */
    __HAL_RCC_PWR_CLK_DISABLE();
    
  }
  
  
  #ifdef  USE_FULL_ASSERT
  /**
    * @brief  Reports the name of the source file and the source line number
    *         where the assert_param error has occurred.
    * @param  file: pointer to the source file name
    * @param  line: assert_param error line source number
    * @retval None
    */
  void assert_failed(uint8_t *file, uint32_t line)
  {
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  
    /* Infinite loop */
    while (1)
    {
    }
  }
  #endif
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  