/**
  ******************************************************************************
  * @file    FatFs/FatFs_MultiDrives/Src/main.c
  * @author  MCD Application Team
  * @brief   Main program body
  *          This sample code shows how to use FatFs with multi drives.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

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

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
FATFS RAMFatFs, SDFatFs;    /* File system objects logical drives */
FIL RAMFile, SDFile;        /* File objects */
char RAMpath[4], SDpath[4]; /* RAM disk and SD card logical drives paths */
uint8_t workBuffer[2*_MAX_SS];

/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  FRESULT res1, res2;                                   /* FatFs function common result codes */
  uint32_t byteswritten1, byteswritten2;                /* File write counts */
  uint32_t bytesread1, bytesread2;                      /* File read counts */
  uint8_t wtext[] = "This is STM32 working with FatFs"; /* File write buffer */
  uint8_t rtext1[100], rtext2[100];                     /* File read buffers */

  /* Configure the MPU attributes */
  MPU_Config();

  /* Enable the CPU Cache */
  CPU_CACHE_Enable();
  
  /* STM32F7xx HAL library initialization:
       - Configure the Flash ART accelerator on ITCM interface
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Global MSP (MCU Support Package) initialization
     */
  HAL_Init();
  
  /* Configure the system clock to 216 MHz */
  SystemClock_Config();
  
  /* Configure LED1 and LED3 */
  BSP_LED_Init(LED1);
  BSP_LED_Init(LED3);
  
  /*##-1- Link the disk I/O drivers ##########################################*/
  if((FATFS_LinkDriver(&SDRAMDISK_Driver, RAMpath) == 0) && (FATFS_LinkDriver(&SD_Driver, SDpath) == 0))
  {  
    /*##-2- Register the file system object to the FatFs module ##############*/
    res1 = f_mount(&RAMFatFs, (TCHAR const*)RAMpath, 0);
    res2 = f_mount(&SDFatFs, (TCHAR const*)SDpath, 0);
    
    if((res1 != FR_OK) || (res2 != FR_OK))
    {
      /* FatFs Initialization Error */
      Error_Handler();
    }
    else
    {
      /*##-3- Create a FAT file system (format) on the logical drives ########*/
      /* WARNING: Formatting the uSD card will delete all content on the device */ 
      res1 = f_mkfs((TCHAR const*)RAMpath, FM_ANY, 0, workBuffer, sizeof(workBuffer));
      res2 = f_mkfs((TCHAR const*)SDpath, FM_ANY, 0, workBuffer, sizeof(workBuffer));
      
      if((res1 != FR_OK) || (res2 != FR_OK))
      {
        /* FatFs Format Error */
        Error_Handler();
      }
      else
      {
        /*##-4- Create and Open new text file objects with write access ######*/
        res1 = f_open(&RAMFile, "0:STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE);
        res2 = f_open(&SDFile, "1:STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE);
        
        if((res1 != FR_OK) || (res2 != FR_OK))
        {
          /* 'STM32.TXT' file Open for write Error */
          Error_Handler();
        }
        else
        {
          /*##-5- Write data to the text files ###############################*/
          res1 = f_write(&RAMFile, wtext, sizeof(wtext), (void *)&byteswritten1);
          res2 = f_write(&SDFile, wtext, sizeof(wtext), (void *)&byteswritten2);
          
          if((byteswritten1 == 0) || (byteswritten2 == 0) || (res1 != FR_OK) || (res2 != FR_OK))
          {
            /* 'STM32.TXT' file write Error */
            Error_Handler();
          }
          else
          {
            /*##-6- Close the open text files ################################*/
            f_close(&RAMFile);
            f_close(&SDFile);
            
            /*##-7- Open the text files object with read access ##############*/
            res1 = f_open(&RAMFile, "0:STM32.TXT", FA_READ);
            res2 = f_open(&SDFile, "1:STM32.TXT", FA_READ);
            
            if((res1 != FR_OK) || (res2 != FR_OK))
            {
              /* 'STM32.TXT' file Open for read Error */
              Error_Handler();
            }
            else
            {
              /*##-8- Read data from the text files ##########################*/
              res1 = f_read(&RAMFile, rtext1, sizeof(rtext1), (UINT*)&bytesread1);
              res2 = f_read(&SDFile, rtext2, sizeof(rtext2), (UINT*)&bytesread2);
              
              if((res1 != FR_OK) || (res2 != FR_OK))
              {
                /* 'STM32.TXT' file Read or EOF Error */
                Error_Handler();
              }
              else
              {
                /*##-9- Close the open text files ############################*/
                f_close(&RAMFile);
                f_close(&SDFile);
                
                /*##-10- Compare read data with the expected data ############*/
                if((bytesread1 != byteswritten1) || (bytesread2 != byteswritten2))
                {                
                  /* Read data is different from the expected data */
                  Error_Handler();
                }
                else
                {
                  /* Success of the demo: no error occurrence */
                  BSP_LED_On(LED1);
                }
              }
            }
          }
        }
      }
    }
  }
  
  /*##-11- Unlink the disk I/O drivers #######################################*/
  FATFS_UnLinkDriver(RAMpath);
  FATFS_UnLinkDriver(SDpath);
  
  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 216000000
  *            HCLK(Hz)                       = 216000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 432
  *            PLL_P                          = 2
  *            PLL_Q                          = 9
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 7
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  HAL_StatusTypeDef ret = HAL_OK;
  
  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 432;  
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
  RCC_OscInitStruct.PLL.PLLR = 7;
  
  ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }

  /* Activate the OverDrive to reach the 216 MHz Frequency */
  ret = HAL_PWREx_EnableOverDrive();
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }
  
  /* Select PLL 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_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Turn LED3 on */
  BSP_LED_On(LED3);
  while(1)
  {
  }
}


/**
  * @brief  Configure the MPU attributes
  * @param  None
  * @retval None
  */
static void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct;

  /* Disable the MPU */
  HAL_MPU_Disable();

  /* Configure the MPU as Strongly ordered for not defined regions */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress = 0x00;
  MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
  MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x87;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Configure the MPU attributes as WT for SDRAM */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress = 0xC0000000;
  MPU_InitStruct.Size = MPU_REGION_SIZE_32MB;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER1;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x00;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Configure the MPU attributes FMC control registers */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress = 0xA0000000;
  MPU_InitStruct.Size = MPU_REGION_SIZE_8KB;
  MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER2;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x0;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
  
  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

#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

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}