/**
@page MSC_Standalone USB Device Mass Storage (MSC) example
@verbatim
******************************************************************************
* @file USB_Device/MSC_Standalone/readme.txt
* @author MCD Application Team
* @brief Description of the USB Device MSC example.
******************************************************************************
* @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.
*
******************************************************************************
@endverbatim
@par Example Description
Use of the USB device application based on the Mass Storage Class (MSC).
This is a typical example on how to use the STM32F3xx USB 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 STM32373C-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 72 MHz. The Full Speed (FS) USB module uses
internally a 48-MHz clock, which is generated from an integrated PLL.
It is possible to remappe the USB interrupts (USB_LP and USB_WKUP) on interrupt lines 75 and 76.
User can select USB line Interrupt through macro defined in main.h.
(USE_USB_INTERRUPT_DEFAULT and USE_USB_INTERRUPT_REMAPPED)
@note The application needs to ensure that the SysTick time base is set to 1 millisecond
to have correct HAL configuration.
@note To reduce the example footprint, the toolchain dynamic allocation is replaced by a static allocation
by returning the address of a pre-defined static buffer with the MSC class structure size.
@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 built-in USB peripheral of the STM32F3x does not provide a specific interrupt for USB cable plug/unplug
detection. The correct way to detect the USB cable plug/unplug is to detect the availability of the VBUS line
using a normal GPIO pin (external interrupt line).
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.
@par Directory contents
- USB_Device/MSC_Standalone/Src/main.c Main program
- USB_Device/MSC_Standalone/Src/system_stm32f3xx.c STM32F3xx system clock configuration file
- USB_Device/MSC_Standalone/Src/stm32f3xx_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/stm32f3xx_it.h Interrupt handlers header file
- USB_Device/MSC_Standalone/Inc/stm32f3xx_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 example runs on STM32F373xx devices.
- This example has been tested with STMicroelectronics STM32373C-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.
- STM32373C-EVAL RevB Set-up
- Insert a microSD card into the STM32373C-EVAL uSD slot (CN7)
- Connect the STM32373C-EVAL board to the PC through 'USB Type A-Male
to A-Male' cable to the CN16 connector.
@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
- Run the example
*/
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