/**
  ******************************************************************************
  * @file    FLASH/FLASH_WriteProtection/Src/main.c
  * @author  MCD Application Team
  * @brief   This example provides a description of how to set write protection on
  *          STM32F0xx FLASH.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F0xx_HAL_Examples
  * @{
  */

/** @addtogroup FLASH_WriteProtection
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
/* Private define ------------------------------------------------------------*/

/* Uncomment this line to Enable Write Protection */
//#define WRITE_PROTECTION_ENABLE

/* Uncomment this line to Disable Write Protection */
//#define WRITE_PROTECTION_DISABLE

#define FLASH_USER_START_ADDR       ADDR_FLASH_PAGE_24   /* Start @ of user Flash area */
#define FLASH_USER_END_ADDR         ADDR_FLASH_PAGE_28   /* End @ of user Flash area */
#define FLASH_PAGE_TO_BE_PROTECTED OB_WRP_PAGES24TO27  

#define DATA_32                     ((uint32_t)0x12345678)

/* Check the status of the switches */
/* Enable by default the disable protection */
#if !defined(WRITE_PROTECTION_ENABLE)&&!defined(WRITE_PROTECTION_DISABLE)
#define WRITE_PROTECTION_DISABLE
#endif /* !WRITE_PROTECTION_ENABLE && !WRITE_PROTECTION_DISABLE */

/* Both switches cannot be enabled in the same time */
#if defined(WRITE_PROTECTION_ENABLE)&&defined(WRITE_PROTECTION_DISABLE)
#error "Switches WRITE_PROTECTION_ENABLE & WRITE_PROTECTION_DISABLE cannot be enabled in the time!"
#endif /* WRITE_PROTECTION_ENABLE && WRITE_PROTECTION_DISABLE */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint32_t Address = 0;
uint32_t PageError = 0;
__IO TestStatus MemoryProgramStatus = PASSED;
/*Variable used for Erase procedure*/
static FLASH_EraseInitTypeDef EraseInitStruct;
/*Variable used to handle the Options Bytes*/
static FLASH_OBProgramInitTypeDef OptionsBytesStruct;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F0xx HAL library initialization:
       - Configure the Flash prefetch
       - 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 48 MHz */
  SystemClock_Config();

  /* Initialize LED2 */
  BSP_LED_Init(LED2);
  
  /* Initialize test status */
  MemoryProgramStatus = PASSED;
  
  /* Unlock the Flash to enable the flash control register access *************/ 
  HAL_FLASH_Unlock();

  /* Unlock the Options Bytes *************************************************/
  HAL_FLASH_OB_Unlock();

  /* Get pages write protection status ****************************************/
  HAL_FLASHEx_OBGetConfig(&OptionsBytesStruct);

#ifdef WRITE_PROTECTION_DISABLE
  /* Check if desired pages are already write protected ***********************/
  if((OptionsBytesStruct.WRPPage & FLASH_PAGE_TO_BE_PROTECTED) != FLASH_PAGE_TO_BE_PROTECTED)
  {
    /* Restore write protected pages */
    OptionsBytesStruct.OptionType   = OPTIONBYTE_WRP;
    OptionsBytesStruct.WRPState     = OB_WRPSTATE_DISABLE;
    OptionsBytesStruct.WRPPage = FLASH_PAGE_TO_BE_PROTECTED;
    if(HAL_FLASHEx_OBProgram(&OptionsBytesStruct) != HAL_OK)
    {
      /* Error occurred while options bytes programming. **********************/
      while (1)
      {
        /* Make LED2 blink (100ms on, 2s off) to indicate error in OB programming operation */
        BSP_LED_On(LED2);
        HAL_Delay(100);
        BSP_LED_Off(LED2);
        HAL_Delay(2000);
      }
    }

    /* Generate System Reset to load the new option byte values ***************/
    HAL_FLASH_OB_Launch();
  }
#elif defined WRITE_PROTECTION_ENABLE
  /* Check if desired pages are not yet write protected ***********************/
  if(((~OptionsBytesStruct.WRPPage) & FLASH_PAGE_TO_BE_PROTECTED )!= FLASH_PAGE_TO_BE_PROTECTED)
  {
    /* Enable the pages write protection **************************************/
    OptionsBytesStruct.OptionType = OPTIONBYTE_WRP;
    OptionsBytesStruct.WRPState   = OB_WRPSTATE_ENABLE;
    OptionsBytesStruct.WRPPage    = FLASH_PAGE_TO_BE_PROTECTED;
    if(HAL_FLASHEx_OBProgram(&OptionsBytesStruct) != HAL_OK)
    {
      /* Error occurred while options bytes programming. **********************/
      while (1)
      {
        /* Make LED2 blink (100ms on, 2s off) to indicate error in OB programming operation */
        BSP_LED_On(LED2);
        HAL_Delay(100);
        BSP_LED_Off(LED2);
        HAL_Delay(2000);
      }
    }

    /* Generate System Reset to load the new option byte values ***************/
    HAL_FLASH_OB_Launch();
  }
#endif /* WRITE_PROTECTION_DISABLE */

  /* Lock the Options Bytes *************************************************/
  HAL_FLASH_OB_Lock();

  /* The selected pages are not write protected *******************************/
  if ((OptionsBytesStruct.WRPPage & FLASH_PAGE_TO_BE_PROTECTED) != 0x00)
  {
    /* 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()'
      */
      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);
      }
    }

    /* FLASH Word program of DATA_32 at addresses 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);
        }
      }
    }

    /* Check the correctness of written data */
    Address = FLASH_USER_START_ADDR;

    while (Address < FLASH_USER_END_ADDR)
    {
      if((*(__IO uint32_t*) Address) != DATA_32)
      {
        MemoryProgramStatus = FAILED;
      }
      Address += 4;
    }
  }
  else
  { 
    /* The desired pages are write protected */ 
    /* Check that it is not allowed to write in this page */
    Address = FLASH_USER_START_ADDR;
    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, Address, DATA_32) != HAL_OK)
    {
      /* Error returned during programming. */
      /* Check that WRPERR flag is well set */
      if (HAL_FLASH_GetError() == HAL_FLASH_ERROR_WRP) 
      {
        MemoryProgramStatus = FAILED;
      }
      else
      {
        /* Another error occurred.
           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);
        }
      }
    }
    else
    {
      /* Write operation is successful. Should not occur
         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 there is an issue to program data*/
  if (MemoryProgramStatus == PASSED)
  {
    /* 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            = PLL (HSI/2)
  *            SYSCLK(Hz)                     = 48000000
  *            HCLK(Hz)                       = 48000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 8000000
  *            PREDIV                         = 1
  *            PLLMUL                         = 12
  *            Flash Latency(WS)              = 1
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* No HSE Oscillator on Nucleo, Activate PLL with HSI/2 as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}
#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****/
