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STM32CubeF4/Projects/STM324x9I_EVAL/Applications/USB_Host/MSC_RTOS/readme.txt

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/**
@page MSC_RTOS USB Host Mass Storage (MSC) RTOS application
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file USB_Host/MSC_RTOS/readme.txt
* @author MCD Application Team
* @brief Description of the USB Host MSC RTOS 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 STM32F4xx devices in RTOS mode
configuration.
This is a typical application on how to use the STM32F4xx 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 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 (FS or HS-IN-FS), 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 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. It creates a normal
priority thread, that executes a MSC routine.
A menu is displayed and the user can select any operation from the menu using the Joystick buttons:
- "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 Key button to display the whole USB flash disk content (recursion level 2).
- "Re-Enumerate" operation performs a new Enumeration of the device.
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in HAL time base ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the HAL time base interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the HAL time base interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application needs to ensure that the HAL time base is always set to 1 millisecond to have correct
HAL operation.
@note The FreeRTOS heap size configTOTAL_HEAP_SIZE defined in FreeRTOSConfig.h is set according to the OS resources memory requirements of the application with +10% margin and rounded to the upper Kbyte boundary.
For more details about the STM32Cube USB Host library, please refer to UM1720
"STM32Cube USB Host 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
- "USE_USB_HS" and "USE_USB_HS_IN_FS" when using USB High Speed (HS) Core in FS mode
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.
Since this is an RTOS based application, built around FreeRTOS and CMSIS-OS wrapping layer common APIs,
the RTOS is enabled by setting, #define USBH_USE_OS 1
@par Keywords
Connectivity, USB_Host, FreeRTOS, MSC, Mass Storage, Full Speed, High Speed, BOT, SCSI, Removable drive, FatFs,
File system, Write, Read, Format
@par Directory contents
- USB_Host/MSC_RTOS/Src/main.c Main program
- USB_Host/MSC_RTOS/Src/usbh_diskio_dma.c FatFS usbh diskio driver implementation
- USB_Host/MSC_RTOS/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- USB_Host/MSC_RTOS/Src/stm32f4xx_it.c Interrupt handlers
- USB_Host/MSC_RTOS/Src/menu.c MSC State Machine
- USB_Host/MSC_RTOS/Src/usbh_conf.c General low level driver configuration
- USB_Host/MSC_RTOS/Src/explorer.c Explore the USB flash disk content
- USB_Host/MSC_RTOS/Src/file_operations.c Write/read file on the disk
- USB_Host/MSC_RTOS/Src/usbh_diskio.c USB diskio interface for FatFs
- USB_Host/MSC_RTOS/Inc/main.h Main program header file
- USB_Host/MSC_RTOS/Inc/usbh_diskio_dma.h FatFS usbh diskio driver header file
- USB_Host/MSC_RTOS/Inc/stm32f4xx_it.h Interrupt handlers header file
- USB_Host/MSC_RTOS/Inc/lcd_log_conf.h LCD log configuration file
- USB_Host/MSC_RTOS/Inc/stm32f4xx_hal_conf.h HAL configuration file
- USB_Host/MSC_RTOS/Inc/FreeRTOSConfig.h FreeRTOS Module Configuration file
- USB_Host/MSC_RTOS/Inc/usbh_conf.h USB Host driver Configuration file
- USB_Host/MSC_RTOS/Inc/ffconf.h FAT file system module configuration file
@par Hardware and Software environment
- This application runs on STM32F429xx/STM32F439xx devices.
- This application has been tested with STMicroelectronics STM324x9I-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.
- STM324x9I-EVAL RevB Set-up
- Plug the USB key into the STM324x9I-EVAL board through 'USB micro A-Male
to A-Female' cable to the connector:
- CN9 : to use USB High Speed (HS) with embedded PHY(U7)
- CN14: to use USB Full Speed (FS)
Please ensure that jumper JP16 is not fitted.
- CN15: to use USB HS-IN-FS.
Note that some FS signals are shared with the HS ULPI bus, so some PCB rework is needed.
For more details, refer to section 2.8 USB OTG2 HS & FS in UM1667
@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:
- STM324x9I-EVAL_USBH-HS: to configure the project for STM32F4xx devices using USB OTG HS peripheral
- STM324x9I-EVAL_USBH-FS: to configure the project for STM32F4xx devices using USB OTG FS peripheral
- STM324x9I-EVAL_USBH-HS-IN-FS: to configure the project for STM32F4xx devices and use USB OTG HS
peripheral In FS (using embedded PHY).
- Run the application
*/
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