STM32CubeF4

/**
  @page MSC_Standalone USB Device Mass Storage (MSC) application
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    USB_Device/MSC_Standalone/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the USB Device MSC application.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
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  ******************************************************************************
  @endverbatim

@par Application Description

This application shows how to use the USB device application based on the Mass Storage Class (MSC) on the STM32F4xx devices.

This is a typical application on how to use the STM32F4xx USB OTG Device peripheral to communicate with a PC
Host using the Bulk Only Transfer (BOT) and Small Computer System Interface (SCSI) transparent commands, 
while the microSD card is used as storage media. The STM32 MCU is enumerated as a MSC device using the 
native PC Host MSC driver to which the STM324xG-EVAL board is connected.

At the beginning of the main program the HAL_Init() function is called to reset all the peripherals,
initialize the Flash interface and the systick. The user is provided with the SystemClock_Config()
function to configure the system clock (SYSCLK) to run at 168 MHz. The Full Speed (FS) USB module uses
internally a 48-MHz clock, which is generated from an integrated PLL. In the High Speed (HS) mode the
USB clock (60 MHz) is driven by the ULPI.

It's worth noting that the system clock (SYSCLK) can be configured, depending on the used USB Core:
 - SYSCLK is set to 168 MHz: for FS Core because used embedded PHY requires 48 MHz clock,
                             achieved only when system clock is set to 168 MHz.                             
 - SYSCLK is set to 180 MHz: for only HS Core, since no embedded PHY is used.

When the application is started, the user has just to plug the USB cable into a PC host and the device 
is automatically detected. A new removable drive appears in the system window and write/read/format 
operations can be performed as with any other removable drive.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.
      
For more details about the STM32Cube USB Device library, please refer to UM1734 
"STM32Cube USB Device library".
      

@par USB Library Configuration

To select the appropriate USB Core to work with, user must add the following macro defines within the
compiler preprocessor (already done in the preconfigured projects provided with this application):
      - "USE_USB_HS" when using USB High Speed (HS) Core
      - "USE_USB_FS" when using USB Full Speed (FS) Core 

@par Keywords

Connectivity, USB Host, MSC, Mass Storage, Full Speed, High Speed, BOT, SCSI, Removable drive, FatFs,
File system, Write, Read, Format

@par Directory contents

  - USB_Device/MSC_Standalone/Src/main.c                  Main program
  - USB_Device/MSC_Standalone/Src/system_stm32f4xx.c      STM32F4xx system clock configuration file
  - USB_Device/MSC_Standalone/Src/stm32f4xx_it.c          Interrupt handlers
  - USB_Device/MSC_Standalone/Src/usbd_conf.c             General low level driver configuration
  - USB_Device/MSC_Standalone/Src/usbd_desc.c             USB device MSC descriptor
  - USB_Device/MSC_Standalone/Src/ubsd_storage.c          Media Interface Layer
  - USB_Device/MSC_Standalone/Inc/main.h                  Main program header file
  - USB_Device/MSC_Standalone/Inc/stm32f4xx_it.h          Interrupt handlers header file
  - USB_Device/MSC_Standalone/Inc/stm32f4xx_hal_conf.h    HAL configuration file
  - USB_Device/MSC_Standalone/Inc/usbd_conf.h             USB device driver Configuration file
  - USB_Device/MSC_Standalone/Inc/usbd_desc.h             USB device MSC descriptor header file
  - USB_Device/MSC_Standalone/Inc/ubsd_storage.h          Media Interface Layer header file   

	
@par Hardware and Software environment

  - This application runs on STM32F407xx/STM32F417xx devices.
    
  - This application has been tested with STMicroelectronics STM324xG-EVAL RevC 
    evaluation boards and can be easily tailored to any other supported device 
    and development board.

  - STM324xG-EVAL RevC Set-up
    - Insert a microSD card into the STM324xG-EVAL uSD slot (CN6)
    - Connect the STM324xG-EVAL board to the PC through 'USB micro A-Male 
      to A-Male' cable to the connector:
      - CN9: to use USB High Speed (HS) 
      - CN8: to use USB Full Speed (FS)
             Please ensure that jumpers JP16 and JP22 are in position 1-2.

    
@par How to use it ?

In order to make the program work, you must do the following :
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - In the workspace toolbar select the project configuration:
   - STM324xG-EVAL_USBH-HS: to configure the project for STM32F4xx devices using USB OTG HS peripheral
   - STM324xG-EVAL_USBH-FS: to configure the project for STM32F4xx devices using USB OTG FS peripheral
 - Run the application
 
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */