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Fx_SRAM_File_Edit_Standalone application description

This application provides an example of FileX stack usage on P-NUCLEO-WB55 board, running in standalone mode (without ThreadX). It demonstrates how to create a Fat File system on the internal SRAM memory using FileX.

The application is designed to execute file operations on the SRAM-Disk device, it provides all required software code for properly managing it.

The application's main calls the MX_FileX_Process() function that handles file operations. At this stage, all FileX resources are created and the SRAM driver is initialized. After that, the MX_FileX_Process() will start by formatting the SRAM-Disk using FileX services. The resulting file system is a FAT32 compatible, with 512 bytes per sector.

Upon successful opening of the created SRAM-Disk media, FileX continue with creating a file called "STM32.TXT" into the root directory, then write into it some predefined data. Then file is re-opened in read only mode and content is checked.

To configure FileX in standalone mode, the following flags should be added in the "fx_user.h" file:

#define FX_SINGLE_THREAD
#define FX_STANDALONE_ENABLE

Expected success behavior

Successful operation is marked by a toggling green LED light.

Also, information regarding executing operation on the SRAM-Disk is printed to the serial port.

Error behaviors

On failure, the red LED is switched ON and the green LED is switched OFF.

Assumptions if any

None

Known limitations

None

FileX/LevelX usage hints

  • When calling the fx_media_format() API, it is highly recommended to understand all the parameters used by the API to correctly generate a valid filesystem.

Keywords

FileX, File System, FAT32, SRAM, SRAM-DISK

Hardware and Software environment

  • This application runs on STM32WBxx devices.

  • This application has been tested with STMicroelectronics P-NUCLEO-WB55 boards Revision MB1355C-01 and can be easily tailored to any other supported device and development board.

  • This application uses USART1 to display logs, the hyperterminal configuration is as follows:

    • BaudRate = 115200 baud
    • Word Length = 8 Bits
    • Stop Bit = 1
    • Parity = none
    • Flow control = None

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