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/**
@page MSC_Standalone USB Host Mass Storage (MSC) application
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file USB_Host/MSC_Standalone/readme.txt
* @author MCD Application Team
* @brief Description of the USB Host MSC application.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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 Application Description
This application shows how to use the USB host application based on the Mass Storage Class (MSC) on the STM32F446xx device.
This is a typical application on how to use the STM32F446ZE USB OTG Host peripheral to operate with an USB
flash disk using the Bulk Only Transfer (BOT) and Small Computer System Interface (SCSI) transparent
commands combined with a file system FatFs (Middleware component).
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 180 MHz. The Full Speed (FS) USB module uses
internally a 48-MHz clock which is coming from the PLL SAI.
The 48 MHz clock for the USB FS can be derived from one of the two following sources:
– PLL clock (clocked by the HSE): If the USB uses the PLL as clock source, the PLL clock must be programmed
to output 48 MHz frequency (USBCLK = PLLVCO/PLLQ).
– PLLSAI clock (clocked by the HSE): If the USB uses the PLLSAI as clock source, the PLLSAI clock must be programmed
to output 48 MHz frequency (USBCLK = PLLSAIVCO/PLLSAIP).
When the application is started, the connected USB flash disk device is detected in MSC mode and gets
initialized. The STM32 MCU behaves as a MSC Host, it enumerates the device and extracts VID, PID,
manufacturer name, Serial no and product name information and displays it on the LCD screen.
This application is based on read/write file and explore the USB flash disk content trough a MSC routine.
LCD and joystick are provided by Adafruit 1.8" TFT shield to be plugged on Arduino connectors.
User can start any operations using User button:
- "File Operations" operation writes a small text file (less to 1 KB) on the USB flash disk.
- "Explorer Disk" operation explores the USB flash disk content and displays it on the LCD screen.
User has to press the User button to display the whole USB flash disk content (recursion level 2).
@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 Host library, please refer to UM1720
"STM32Cube USB Host library".
@par USB Library Configuration
It is possible to fine tune needed USB Host features by modifying defines values in USBH configuration
file “usbh_conf.h” available under the project includes directory, in a way to fit the application
requirements, such as:
- Level of debug: USBH_DEBUG_LEVEL
0: No debug messages
1: Only User messages are shown
2: User and Error messages are shown
3: All messages and internal debug messages are shown
By default debug messages are displayed on the debugger IO terminal; to redirect the Library
messages on the LCD screen, lcd_log.c driver need to be added to the application sources.
@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_Host/MSC_Standalone/Src/main.c Main program
- USB_Host/MSC_Standalone/Src/usbh_diskio_dma.c FatFS usbh diskio driver implementation
- USB_Host/MSC_Standalone/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- USB_Host/MSC_Standalone/Src/stm32f4xx_it.c Interrupt handlers
- USB_Host/MSC_Standalone/Src/menu.c MSC State Machine
- USB_Host/MSC_Standalone/Src/usbh_conf.c General low level driver configuration
- USB_Host/MSC_Standalone/Src/explorer.c Explore the USB flash disk content
- USB_Host/MSC_Standalone/Src/file_operations.c Write/read file on the disk
- USB_Host/MSC_Standalone/Src/usbh_diskio.c USB diskio interface for FatFs
- USB_Host/MSC_Standalone/Inc/main.h Main program header file
- USB_Host/MSC_Standalone/Inc/usbh_diskio_dma.h FatFS usbh diskio driver header file
- USB_Host/MSC_Standalone/Inc/stm32f4xx_it.h Interrupt handlers header file
- USB_Host/MSC_Standalone/Inc/lcd_log_conf.h LCD log configuration file
- USB_Host/MSC_Standalone/Inc/stm32f4xx_hal_conf.h HAL configuration file
- USB_Host/MSC_Standalone/Inc/usbh_conf.h USB Host driver Configuration file
- USB_Host/MSC_Standalone/Inc/ffconf.h FAT file system module configuration file
@par Hardware and Software environment
- This application runs on STM32F446xx device.
- This application has been tested with STMicroelectronics NUCLEO-F446ZE Rev.B
boards and can be easily tailored to any other supported device and board.
- NUCLEO-F446ZE Set-up
- Plug the USB key into the NUCLEO-F446ZE board through 'USB micro A-Male
to A-Female' cable to the connector CN13.
- Make sure that the jumper JP4 is closed.
- Adafruit 1.8" TFT shield must be connected on CN7,CN8, CN9 and CN10 Arduino connectors,
for more details please refer to UM1726.
- Make sure the SB146, SB121 are closed and the SB174, SB165, SB122 are opened on the NUCLEO-F446ZE board (bottom side)
@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 application
*/
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