Problem about file create on nRF52840

[Blance]

usbd_msc.7z

Hello everyone:

The problem is still not resolved

Test broad is PCA10056

Test code was modified by \SDK17.0\examples\peripheral\usbd_msc\pca10056\blank\ses

Try to create a directory and write a file on this

Open txt file like under picture,data damage on address 0x3200~0x3400 ,What am I doing wrong?

[Blance]

Hi All:

Add the test to continuously write files to the root directory, the content is also 0x00~0xFF loop,
4k bytes are written once,
After writing 400 times, whether the read data content meets the 0x00~0xFF cycle,

if yes, the number of successes is +1, otherwise the number of failures is +1

Create a new file after the comparison is over, if the memory is insufficient, delete the oldest file

Performing this test on my personal hardware can still reproduce the abnormal file problem

format setting FAT12 4096 Bytes

three device test at same time,and stop test when get fail,finally I get same result 

"success: 62, fail: 1"

I think there may be incompatibility between QSPI and FATFS
The address needs to be aligned to 4 Bytes. This requirement is suspicious
Can someone provide an interface that does not need to be aligned with 4 Bytes?

[Blance]

Hi All:

I tried to modify the experiment and change 400 to 40. The test result is still that about 60 files will have one file corruption. The preliminary conclusion has nothing to do with the size of the files, but with the number of files.