NCS mass littlefs

Question

Hi,

I am trying to run the mass sample of NCS V2.6.0 (zephyr\samples\subsys\usb\mass).

I followed the README.rst,

- build the sample with -DCONFIG_APP_MSC_STORAGE_FLASH_LITTLEFS=y,

- download it to the nrf52840DK, (the log looks OK )

\0*** Booting nRF Connect SDK v3.5.99-ncs1 ***
[00:00:00.253,265] [0m<inf> flashdisk: Initialize device NAND[0m
[00:00:00.253,265] [0m<inf> flashdisk: offset 0, sector size 512, page size 4096, volume size 8192000[0m
Area 0 at 0x0 on mx25r6435f@0 for 8192000 bytes
[00:00:00.257,537] [0m<inf> littlefs: LittleFS version 2.5, disk version 2.0[0m
[00:00:00.259,552] [0m<inf> littlefs: FS at mx25r6435f@0:0x0 is 2000 0x1000-byte blocks with 512 cycle[0m
[00:00:00.259,582] [0m<inf> littlefs: sizes: rd 16 ; pr 16 ; ca 64 ; la 32[0m
Mount /lfs: 0
/lfs: bsize = 16 ; frsize = 4096 ; blocks = 2000 ; bfree = 1998
/lfs opendir: 0
End of files
[00:00:00.311,401] [0m<inf> main: The device is put in USB mass storage mode.
[0m

- connect the USB to the WIN10， and the WIN10 requests a format operation, after formatting, the mass storage works

The problem is that after the power-on reset, and connecting the USB to the WIN10 again, the WIN10 still requests a format operation.

if power-on reset with USB is connected, the log as below

\0*** Booting nRF Connect SDK v3.5.99-ncs1 ***
[00:00:00.253,295] [0m<inf> flashdisk: Initialize device NAND[0m
[00:00:00.253,295] [0m<inf> flashdisk: offset 0, sector size 512, page size 4096, volume size 8192000[0m
Area 0 at 0x0 on mx25r6435f@0 for 8192000 bytes
[00:00:00.257,598] [0m<inf> littlefs: LittleFS version 2.5, disk version 2.0[0m
[00:00:00.259,582] [0m<inf> littlefs: FS at mx25r6435f@0:0x0 is 2000 0x1000-byte blocks with 512 cycle[0m
[00:00:00.259,613] [0m<inf> littlefs: sizes: rd 16 ; pr 16 ; ca 64 ; la 32[0m
[00:00:00.275,695] [1;31m<err> littlefs: WEST_TOPDIR/modules/fs/littlefs/lfs.c:1234: Corrupted dir pair at {0x0, 0x1}[0m
[00:00:00.275,726] [1;33m<wrn> littlefs: can't mount (LFS -84); formatting[0m
[00:00:00.356,445] [0m<inf> littlefs: /lfs mounted[0m
Mount /lfs: 0
/lfs: bsize = 16 ; frsize = 4096 ; blocks = 2000 ; bfree = 1998
/lfs opendir: 0
End of files
[00:00:00.407,989] [0m<inf> main: The device is put in USB mass storage mode.
[0m
[00:00:00.718,933] [1;31m<err> usb_device: Request buffer too small[0m

Jason · Accepted Answer

Hi Hieu, 
 Thanks for your reply. It is a surprise that Windows does not support the LittleFS by default. I didn't find any official driver for Windows. Do you have a recommended LittleFS driver or explorer? I assume there is some driver, after installing such a driver, Windows can recognize the mass storage with LittleFS just like a normal disk, there is no need to open any special explorer/software. otherwise, the mass storage with LittleFS makes no sense for our product.

Hieu · Answer

Hi Jason, 
 We don't have anything officially recommended, and I can't find any driver with a quick search. I found this: https://github.com/bluscape/LittleFS-Explorer-for-Windows . However, note that we are not affiliated with that, and does not comment about its useability or reliability. 
 If you want Windows to support your mass storage natively, how about using FatFS instead?

Hieu · Answer

Hi Jason, 
 If you eventually use the Partition Manager in your project (which happens automatically when you start to use a bootloader/add DFU), then there are some setups required in the Partition Manager configuration file. This is detailed in https://docs.nordicsemi.com/bundle/ncs-2.6.1/page/nrf/scripts/partition_manager/partition_manager.html . 
 That is true up to NCS 2.6.x. NCS 2.7.0 will use sysbuild instead of Partition Manager and things might be different. 2.7.0 is in RC3 at the moment, and I haven't started with it yet, so I will stop commenting further. 
 If you no longer have any questions on the original issue, please feel free to close this case any time

NCS mass littlefs

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