A problem with USB mas storage.

[Sergii]

Hello.
I have a problem with usbd_msc .
When I plug the device by usb and Windows sees the device how mass storage. After I copy files to the device - it copies and all is good. But when I plug off and plug on USB again - some files are broken. It happens some times and random. In the biggest part of the times help "Safely Remove", but not all time.

Note! I use demo APP from SDK15 

[Håkon Alseth]

Hello,

 

Which revision of the nRF52840 are you using?

If you are using the latest revision of the nRF52840, there are some erratas that has not been properly applied in our SDK; please see this thread.

 

Please also note that former engineering revision A has now been deprecated and will not work properly with SDK 15.

 

Kind regards,

Håkon

[Sergii]

Hello,

I use C revision.

Regards,

Sergii

[Sergii]

When I make  "Safely remove" - it still brocks files. 

When I make  "Safely remove" and press the button on the board BOOT/RESET at the same time and off the device - the files are not broken (looks all is good in this case) 

 

[Håkon Alseth]

Do I understand correctly that if you reset the device, the files are then restored (ie: not broken) ?

I have tried to replicate this behavior on my boards, but I have not been able to do this. Is there a specific procedure to reproduce the issue?

Best regards,

Håkon

[Sergii]

Hello,

Yes, correct. Which the board do you use? Do you use the same revision of the mcu?

Could you please share the test code ?

[Sergii]

I tasted it on two dev boards

[Håkon Alseth]

Hi,

 

I tested this on two boards, one with engineering revision C and one with the production release of the silicon. I am using the usbd_msc example as-is.

Are you seeing the same issue with a unmodified version of usbd_msc example? Given that the failure description disappears when you reset the board, it indicates that the actual data is not corrupted, but the firmware is somehow.

Is there specific steps that you're following to recreate the issue?

Best regards,

Håkon