FileX on QSPI files are not kept after reset

[JonConesa]

Hi,

I’m working with a custom PCB based on an STM32H743BI and an external MT25TL01G memory device.

To manage the data I’m using FileX + LevelX. I’m able to create the media, create directories, create files, write to them, and read them without issues. However, I’m running into a problem when trying to read files after a reset.

After formatting the media with:

fx_media_format(&pFileManagerDesc->fxFileMedia,                                                            
                                        fx_stm32_levelx_nor_driver,                                                         
                                        (VOID *)LX_NOR_QSPI_DRIVER_ID,                                                      
                                        (UCHAR *) mediaBuffer,                                                              
                                        sizeof(mediaBuffer),                                                                
                                        QSPI_VOLUME_NAME,                                                                   
                                        QSPI_NUMBER_OF_FATS,                                                                
                                        32,                                                                                 
                                        QSPI_HIDDEN_SECTORS,                                                                
                                        ((LX_STM32_QSPI_FLASH_SIZE - LX_STM32_QSPI_SECTOR_SIZE) / QSPI_SECTOR_SIZE),        
                                        QSPI_SECTOR_SIZE,                                                                   
                                        8,                                                                                  
                                        1,                                                                                  
                                        1);                                                                                

I open the media and try to read from it, but I always the error FX_NO_FOUND trying to open the file.

This doesn’t happen if I create a file first. I’m not sure if I’m missing a step before reading the media after formatting.

I’m not performing any erase operation because I have: LX_STM32_QSPI_ERASE set to 0

I have followed the example from:

https://github.com/STMicroelectronics/x-cube-azrtos-h7/tree/main/Projects/STM32H747I-DISCO/Applications 

Thanks!

[Saket_Om · Accepted solution]

Hello @JonConesa 

After a reset, you must not call fx_media_format() again, because it recreates the FAT filesystem and effectively erases all existing files (their directory entries and allocation info are lost, so fx_file_open() returns FX_NOT_FOUND). The correct approach is to call fx_media_format() only once, then on every subsequent boot/reset simply call fx_media_open() to mount the existing volume and access your files.

[Andrew Neil]

@JonConesa - what @Saket_Om said is described here.

[JonConesa]

Hi @Saket_Om,

Thanks for your reply, and sorry for getting back to you late.

My code is now working, thank you so much!! :)