QUERY · ISSUE

[nRF port] Unable to Activate the FAT File System

openby sebi5361opened 2019-09-30updated 2019-12-06

port-nrf

I noticed that FAT file system couldn't be enabled on a nRF board as open("code.py", "wb") would fail making it impossible to create files onto the board.

Indeed, after building and flashing the firmware with the FAT file system enabled
(#define MICROPY_VFS (1) in mpconfigport.h and make SD=s132 MICROPY_FATFS=1 sd) the following error occurs:

>>> open("code.py", "wb")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 1] EPERM

CANDIDATE · ISSUE

WiPy 1.0 mp v1.8.7 - SD OSError: 19

closedby federicommopened 2017-02-08updated 2017-02-11

From telnet REPL I have :

os.listdir('/sd')
Traceback ......
File .....
OSError: 19
From micropython forum kfricke give me the following answer:
"The was a change regarding the used FAT library
and filesystem mount points. " Then suggested to
file an issue to githib.
The same suggestion I have had from pycom forum.
To be able to read the SD card I have than reflashed the v1.8.6 firmware
Thank

Assessment

Q Qwen · medium

Both issues involve FAT filesystem errors on MicroPython, but they affect different ports (nRF52 vs WiPy/ESP32), have different error codes (EPERM vs OSError:19), and likely have different root causes. Issue #5163 is about FAT filesystem activation failing on nRF boards specifically with EPERM when trying to write files, while #2855 is about a regression in v1.8.7 on WiPy where SD card listing fails with error 19 after FAT library changes. While both relate to FAT filesystem issues, they don't appear to be the same problem or have a direct resolution relationship.

Suggested action

Keep both issues open as they address different port-specific problems. The nRF issue may need investigation into SD card initialization and permission handling on nRF52, while the WiPy issue was about a specific version regression that was resolved by reverting firmware.

[nRF port] Unable to Activate the FAT File System

WiPy 1.0 mp v1.8.7 - SD OSError: 19

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