LittleFS boot_count example

[milador]

Operating System

Windows 10

IDE version

Arduino 1.8.16

Board

Feather nRF52840 Sense

BSP version

1.1.0

Sketch

The boot_count example from littlefs readme file.

What happened ?

No information on how to implement block device operations and the main configuration. Changed user_provided_block_device_read to lfs_bd_read from lfs.h and I am getting errors .

error: 'lfs_bd_read' was not declared in this scope; did you mean 'lfs_dir_read'?

I would like to read and write to the flash.

How to reproduce ?

• Copy and paste the sample code from littlefs readme
• Reference lfs.h

Debug Log

No response

Screenshots

No response

[hathach]

the LFS is already used to manage bonding, there is an higher library that abstract the LFS API to familiar SD file APII

• https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/libraries/InternalFileSytem/src/InternalFileSystem.cpp

you could follow its example there

• https://github.com/adafruit/Adafruit_nRF52_Arduino/tree/master/libraries/InternalFileSytem/examples

[milador]

Can it be used to achieve something similar to EEPROM or FlashStorage? I basically want to read and write variables instead of the intire 128 bytes block of data every time. Thanks

[hathach]

yes, it does, check out its example

[milador]

@hathach Thanks for pointing me toward right direction.I followed the example you provided. But can't figure out how to read and write without creating a file. I must create a file for this approach , right? I basically need to write few integers as device configuration.

[hathach]

LFS is a file system, everything is a file. you should use raw flash API if it is not what you are looking for.

[milador]

@hathach I see, any example for raw flash API read/write ? Something like flash_nrf5x_write(addr, buffer, size) ?

[hathach]

For questions, please post it on the adafruit support forum. There is more people there to help you out, github is mostly for troubleshooting