109 lines
4.8 KiB
Plaintext
109 lines
4.8 KiB
Plaintext
/**
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@page FatFs_USBDisk FatFs with USB disk drive application
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file FatFs/FatFs_USBDisk/readme.txt
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* @author MCD Application Team
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* @brief Description of the FatFs with USB disk drive application
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Application Description
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How to use STM32Cube firmware with FatFs middleware component as a generic FAT
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file system module and STM32 USB On-The-Go (OTG) host library, in both Full
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Speed (FS) and High Speed (HS) modes. This example develops an application
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exploiting FatFs features with USB disk drive configuration.
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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The user is provided with the SystemClock_Config() function to configure the system
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clock (SYSCLK) to run at 180 MHz. The Full Speed (FS) USB module uses internally
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a 48-MHz clock which is coming from the PLL SAI.
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The application is based on writing a text file to a drive, and it's performed
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using FatFs APIs to access the FAT volume as described in the following steps:
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- Link the USB Host disk I/O driver;
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- Register the file system object (mount) to the FatFs module for the USB drive;
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- Create and Open new text file object with write access;
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- Write data to the text file;
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- Close the open text file;
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- Unlink the USB Host disk I/O driver.
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Notice that the application manages possible errors that might occur during the
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access to FAT volume, when using FatFs APIs. In addition, user can check if the
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written text file is available on the USB disk.
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It is possible to fine tune needed FatFs features by modifying defines values
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in FatFs configuration file <20>ffconf.h<> available under the project includes
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directory, in a way to fit the application requirements.
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NUCLEO-446ZE Rev B boards LEDs can be used to monitor the application status:
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- LED2 is ON when the application runs successfully.
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- LED3 is ON when any error occurs.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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For more details about FatFs implementation on STM32Cube, please refer to UM1721 "Developing Applications
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on STM32Cube with FatFs".
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@par Keywords
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Connectivity, FatFS, USB_Host, FAT, File system
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@par Directory contents
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- FatFs/FatFs_USBDisk/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- FatFs/FatFs_USBDisk/Inc/stm32f4xx_it.h Interrupt handlers header file
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- FatFs/FatFs_USBDisk/Inc/main.h Main program header file
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- FatFs/FatFs_USBDisk/Inc/usbh_conf.h General low level driver configuration
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- FatFs/FatFs_USBDisk/Inc/usbh_diskio_dma.h FatFS usbh diskio driver header file
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- FatFs/FatFs_USBDisk/Inc/ffconf.h FAT file system module configuration file
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- FatFs/FatFs_USBDisk/Src/stm32f4xx_it.c Interrupt handlers
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- FatFs/FatFs_USBDisk/Src/main.c Main program
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- FatFs/FatFs_USBDisk/Src/usbh_conf.c USB Host configuration file.
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- FatFs/FatFs_USBDisk/Src/usbh_diskio_dma.c FatFS usbh diskio driver implementation
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- FatFs/FatFs_USBDisk/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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@par Hardware and Software environment
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- This application runs on STM32F446xx devices.
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- This application has been tested with STMicroelectronics NUCLEO-446ZE Rev.B boards
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and can be easily tailored to any other supported device and board.
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- NUCLEO-446ZE Set-up
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- Plug the USB key into the NUCLEO-446ZE Rev.B board through 'USB micro A-Male
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to A-Female' cable (CN13).
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- Make sure that the jumper JP4 is closed
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the application
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*/
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