Porting LittleFs on Nicla Sense ME: nRF52832

[ijf1]

Hi,

We use nRF5 SDK v17.1.0 for custom application (bare-metal / without os). We are trying to port littlefs for External 2MB FLASH connected via QSPI.

Please let me know the configurations required and examples i can refer for the same.

Regards,

Ijaz

[Sigurd]

Hi,

We don't have support for that in nRF5-SDK. But it might be possible to use, ref this post.  Do our nrf5 SDK support the transfer the FileSystem to our SoC? 

[ijf1]

Hi,

I understand littlefs is an opensource and can be ported on nRF52832. Also would like to know is there any sample flash driver for External 2MB FLASH connected via QSPI in nRF52832 chip.

[ijf1]

Hi,

I have written the flash driver for SPIM interface. Tested basic functionalities like read/write/erase.

Currently working on porting littlefs. As nRF5 SDK v17.1.0 does not support LittleFS, can i assume there are no config parameters to be taken care (in sdk_config). 

To clarify it further, am i expected to port "GitHub - littlefs-project/littlefs: A little fail-safe filesystem designed for microcontrollers" completely to  nRF5 SDK v17.1.0.

Could you please clarify this. Thank you.

Regards,

Ijaz Fazily

[Sigurd]

ijf1 said:

can i assume there are no config parameters to be taken care (in sdk_config). 

Yes.

[ijf1]

Hi,

we have integrated GitHub - littlefs-project/littlefs: A little fail-safe filesystem designed for microcontrollers with the nRF5 SDK v17.1.0.

Also referred the following porting example as well,

pyrinas-ble-client/fs.c at master · pyrinas-iot/pyrinas-ble-client · GitHub

But the mounting the filesystem itself is failing. Any suggestion on this please.

Please let me know if I have missed out anything.

Regards,

Ijaz

[Sigurd]

Hi,

ijf1 said:

But the mounting the filesystem itself is failing. Any suggestion on this please.

Generally, you need to check what error-codes you get returned, and run a debug session, and find out where the error-code originated from and why.

[ijf1]

Hi Sigurd,

When I try to mount the filesystem, returns LFS_ERR_CORRUPT (-84, "Corrupted").

When I try to format and remount, returns -28 (no space left on device).

I have rechecked block device configuration and block device operations. 

Block Device Config:

.read_size = 256 bytes,
.prog_size = 256 bytes,
.block_size = 32000, (32k)
.block_count = 64, /* 2 Mbyte external flash */
.lookahead_size = 128 bytes,
.cache_size = 256 bytes,
.block_cycles = 500,

Regards,

Ijaz

[Sigurd]

Hi,

It seems to be a common issues. Maybe checkout some of these issues here, and see if any of the discussion helps, https://github.com/littlefs-project/littlefs/search?q=LFS_ERR_CORRUPT&type=issues , if not, maybe post your own issue in the littlefs project.