/** @page FatFs_USBDisk FatFs with USB disk drive application @verbatim ******************** (C) COPYRIGHT 2015 STMicroelectronics ******************* * @file readme.txt * @author MCD Application Team * @version V1.3.0 * @date 14-August-2015 * @brief Description of the FatFs with USB disk drive application ****************************************************************************** * * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); * You may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.st.com/software_license_agreement_liberty_v2 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ****************************************************************************** @endverbatim @par Application Description This application provides a description on how to use STM32Cube firmware with FatFs middleware component as a generic FAT file system module and STM32 USB On-The-Go (OTG) host library, in High Speed (HS) modes (configured in FS), in order to develop an application exploiting FatFs offred features with USB disk drive configuration. 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. Then the SystemClock_Config() function is used to configure the system clock (SYSCLK) to run at 168 MHz, to provide 48 MHz clock needed for the USB operation. Please note that the USB is not functional if the system clock is set to 180 MHz. The application is based on writing a text file to a drive, and it's performed using FatFs APIs to access the FAT volume as described in the following steps: - Link the USB Host disk I/O driver; - Register the file system object (mount) to the FatFs module for the USB drive; - Create and Open new text file object with write access; - Write data to the text file; - Close the open text file; - Unlink the USB Host disk I/O driver. It is worth noting that the application manages any error occurred during the access to FAT volume, when using FatFs APIs. Otherwise, user can check if the written text file is available on the USB disk. It is possible to fine tune needed FatFs features by modifying defines values in FatFs configuration file “ffconf.h” available under the project includes directory, in a way to fit the application requirements. STM32 Discovery board's LEDs can be used to monitor the application status: - LED3 is ON when the application runs successfully. - LED4 is ON when any error occurs. @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 FatFs implementation on STM32Cube, please refer to UM1721 "Developing Applications on STM32Cube with FatFs". @par Directory contents - FatFs/FatFs_USBDisk/Inc/stm32f4xx_hal_conf.h HAL configuration file - FatFs/FatFs_USBDisk/Inc/stm32f4xx_it.h Interrupt handlers header file - FatFs/FatFs_USBDisk/Inc/main.h Main program header file - FatFs/FatFs_USBDisk/Inc/ffconf.h FAT file system module configuration file - FatFs/FatFs_USBDisk/Src/stm32f4xx_it.c Interrupt handlers - FatFs/FatFs_USBDisk/Src/main.c Main program - FatFs/FatFs_USBDisk/Src/system_stm32f4xx.c STM32F4xx system clock configuration file @par Hardware and Software environment - This application runs on STM32F429xx Devices. - This application has been tested with STM32F429I-Discovery RevB board and can be easily tailored to any other supported device and development board. - STM32F429I-DISCO RevB Set-up - Plug the USB key into the STM32F429I-DISCO board through 'USB micro A-Male to A-Female' cable. @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 * <h3><center>© COPYRIGHT STMicroelectronics</center></h3> */