The FAT32 FS isn't working properly when writeback mode is turned on

[Nandi]

Use 64M Flash to make FAT32 FS, open Writeback mode(NRF_BLOCK_DEV_QSPI_FLAG_CACHE_WRITEBACK), write 1M file "1.txt", "2.txt" in order, use Windows PC to check the prompt "1.txt" damaged.

Environment：SDK15 usbd_msc project

[Håkon Alseth]

Hi,

 

Did you have USB connected when writing?

Here is the documentation for the example: USB MSC Example

It states this:

This example allows you to manipulate the file system (on QSPI memory) only while USB is not connected. If USB is connected, access to the file system from a user application is not possible because MSC is not designed to allow access to the file system from multiple sources.

 

Best regards,

Håkon

[Nandi]

Hi,

USB is disconnected.

This issue is happened in the above operation.

[Håkon Alseth]

Which version of the nRF52840-DK do you have? Note that In SDK v15, workarounds for engineering A were removed, so it will not work as intended.

[Nandi]

Hi,

Thank you for your replay.

It has nothing to do with the nrf52840-dk version. I was connected to another 64M Flash chip and changed the IO port.

I have checked and checked the various situations. It is indeed a problem with the FAT file system.