/**
  ******************************************************************************
  * @file    USB_Host/MSC_Standalone/Src/main.c
  * @author  MCD Application Team
  * @brief   USB host Mass storage demo main file
  ******************************************************************************
  * @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 ----------------------------------------------------------- */
typedef enum
{
  SHIELD_NOT_DETECTED = 0,
  SHIELD_DETECTED
} ShieldStatus;

/* Private define ------------------------------------------------------------ */
/* Private macro ------------------------------------------------------------- */
/* Private variables --------------------------------------------------------- */
USBH_HandleTypeDef hUSBHost;
MSC_ApplicationTypeDef Appli_state = APPLICATION_IDLE;
char USBDISKPath[4];            /* USB Host logical drive path */

/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void SystemClock_Config(void);
static ShieldStatus TFT_ShieldDetect(void);
static void USBH_UserProcess(USBH_HandleTypeDef * phost, uint8_t id);
static void MSC_InitApplication(void);
static void CPU_CACHE_Enable(void);
static void Error_Handler(void);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Configure the MPU attributes */
  MPU_Config();

  /* Enable the CPU Cache */
  CPU_CACHE_Enable();

  /* STM32F7xx HAL library initialization */
  HAL_Init();

  /* Configure the System clock to have a frequency of 216 MHz */
  SystemClock_Config();

  /* Check the availability of adafruit 1.8" TFT shield on top of STM32NUCLEO
   * board. This is done by reading the state of IO PF.03 pin (mapped to
   * JoyStick available on adafruit 1.8" TFT shield). If the state of PF.03 is
   * high then the adafruit 1.8" TFT shield is available. */

  if (TFT_ShieldDetect() != SHIELD_DETECTED)
  {
    Error_Handler();
  }

  /* Init MSC Application */
  MSC_InitApplication();

  /* Init Host Library */
  USBH_Init(&hUSBHost, USBH_UserProcess, 0);

  /* Add Supported Class */
  USBH_RegisterClass(&hUSBHost, USBH_MSC_CLASS);

  /* Start Host Process */
  USBH_Start(&hUSBHost);

  /* Run Application (Blocking mode) */
  while (1)
  {
    /* USB Host Background task */
    USBH_Process(&hUSBHost);

    /* MSC Menu Process */
    MSC_MenuProcess();

    /* MSC Joystick */
    MSC_Joysticky();
  }
}

/**
  * @brief  MSC application Init.
  * @param  None
  * @retval None
  */
static void MSC_InitApplication(void)
{
  /* Configure user Button */
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_GPIO);

  /* Configure Joystick in EXTI mode */
  BSP_JOY_Init();

  /* Initialize the LCD */
  BSP_LCD_Init();

  /* Init the LCD Log module */
  LCD_LOG_Init();

  LCD_LOG_SetHeader((uint8_t *) "OTG FS MSC Host");
  LCD_UsrLog("USBH library started.\n");

  /* Initialize menu and MSC process */
  Menu_Init();
}

/**
  * @brief  User Process
  * @param  phost: Host Handle
  * @param  id: Host Library user message ID
  * @retval None
  */
static void USBH_UserProcess(USBH_HandleTypeDef * phost, uint8_t id)
{
  switch (id)
  {
  case HOST_USER_SELECT_CONFIGURATION:
    break;

  case HOST_USER_DISCONNECTION:
    Appli_state = APPLICATION_DISCONNECT;
    if (f_mount(NULL, "", 0) != FR_OK)
    {
      LCD_ErrLog("ERROR : Cannot DeInitialize FatFs! \n");
    }
    if (FATFS_UnLinkDriver(USBDISKPath) != 0)
    {
      LCD_ErrLog("ERROR : Cannot UnLink FatFS Driver! \n");
    }
    break;

  case HOST_USER_CLASS_ACTIVE:
    Appli_state = APPLICATION_READY;
    break;

  case HOST_USER_CONNECTION:
    if (FATFS_LinkDriver(&USBH_Driver, USBDISKPath) == 0)
    {
      if (f_mount(&USBH_fatfs, "", 0) != FR_OK)
      {
        LCD_ErrLog("ERROR : Cannot Initialize FatFs! \n");
      }
    }
    break;

  default:
    break;
  }
}

/**
  * @brief This function provides accurate delay (in milliseconds) based
  *        on SysTick counter flag.
  * @note This function is declared as __weak to be overwritten in case of other
  *       implementations in user file.
  * @param Delay: specifies the delay time length, in milliseconds.
  * @retval None
  */

void HAL_Delay(__IO uint32_t Delay)
{
  while (Delay)
  {
    if (SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)
    {
      Delay--;
    }
  }
}

/**
  * @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)              = 8000000
  *            PLL_M                          = 8
  *            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;

  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 432;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    while (1)
    {
    };
  }

  /* Activate the OverDrive to reach the 216 Mhz Frequency */
  if (HAL_PWREx_EnableOverDrive() != 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;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
  {
    while (1)
    {
    };
  }
}

/**
  * @brief  Check the availability of adafruit 1.8" TFT shield on top of STM32NUCLEO
  *         board. This is done by reading the state of IO PF.03 pin (mapped to
  *         JoyStick available on adafruit 1.8" TFT shield). If the state of PF.03
  *         is high then the adafruit 1.8" TFT shield is available.
  * @param  None
  * @retval SHIELD_DETECTED: 1.8" TFT shield is available
  *         SHIELD_NOT_DETECTED: 1.8" TFT shield is not available
  */
static ShieldStatus TFT_ShieldDetect(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  /* Enable GPIO clock */
  NUCLEO_ADCx_GPIO_CLK_ENABLE();

  GPIO_InitStruct.Pin = NUCLEO_ADCx_GPIO_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
  HAL_GPIO_Init(NUCLEO_ADCx_GPIO_PORT, &GPIO_InitStruct);

  if (HAL_GPIO_ReadPin(NUCLEO_ADCx_GPIO_PORT, NUCLEO_ADCx_GPIO_PIN) != 0)
  {
    return SHIELD_DETECTED;
  }
  else
  {
    return SHIELD_NOT_DETECTED;
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* User may add here some code to deal with this error */
  while (1)
  {
  }
}

/**
  * @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();
}


/**
  * @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);

  /* 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