STM32 - FileX and MSC - Windows read wrong data

[Dams]

Hi, 

I'm on a applicaiton involving USBX MSC and FileX. 
The final memory for the application is a NOR flash so I also use LevelX.

Acutally, I'm working on a nucleo-U575ZI-Q without NOR flash so I use NOR Simulator on LevelX.

My problem is that a file created with FileX is detected by windows, have the right number of bytes but data are wrong.

My program do this:

1) FileX format the device
2) FileX create the file STM32.TXT and put the data "This is FileX working on STM32". I can see this data on the RAM

3) FileX close and open the file STM32.TXT and I can read the text

4) FileX close the media.

5) USBX open the media and on Windows I see the file STM32.TXT but data are not correct. It's like if this data comes from another part on my RAM.

When the device is connected to a computer, I can create new file, write on it then unplug / plug USB and the new file is still here. I can also edit STM32.TXT.

Has somebody an idea about why FileX can read right data but windows doesn't read right data even if the device is mounted.

Thanks for help !

[DmitryR]

Hello Dams,

what I should tell you first of all. As you are accessing FileX from two independent processes, USBX and internal make sure there is no collision between them.

Then, from your words it looks like that the USBX can write FileX properly but cannot read it properly. In this case it would be handy to see what glue code have you written for USBX read request.

Regards,

Dmitry