Modifications

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== MicroPython File System ==

== MicroPython File System ==

MicroPython board does fits an internal file system. This means that Python language on a MicroPython board can also manage files and directories!

MicroPython board does fits an internal file system. This means that Python language on a MicroPython board can also manage files and directories! Exactly like python does on a computer :-).

[[Fichier:MicroPython-FileSystem.png|256px]]

[[Fichier:MicroPython-FileSystem.png|256px]]

* the {{fname|strip('\r\n')}} remove the carriage return & line feed from the readed line. Otherwise it will also be printed to the REPL (which result into a double line feed).

* the {{fname|strip('\r\n')}} remove the carriage return & line feed from the readed line. Otherwise it will also be printed to the REPL (which result into a double line feed).

== File-system, Writing and data lost ==

== File-systems, Writing and data lost ==

{{underline|'''The computer file-system:'''}}

{{underline|'''The computer file-system:'''}}

{{underline|'''SD Card file system:'''}}

{{underline|'''SD Card file system:'''}}

Regardless of the platform using the SD card, the content and stability of a SD card is veryyyyyyy sensitive to the open/close operation on the file-system. Users of the Raspberry-Pi nano computer knows that powering of a Pi during SD write operation could completely corrupt the file-system. In some rare situation the SD card can be made completely unreadable.

Regardless of the platform using the SD card, the content and stability of a SD card is veryyyyyyy sensitive to the open/close operation on the file-system. Users of the Raspberry-Pi nano computer knows that powering of a Pi during SD write operation could completely corrupt the file-system. In some rare situation the SD card can be made completely unreadable.

LittleFS is a flash-based device filesystem. It has been designed to be more resistant to filesystem corruption and power failures resilient. Unless other file-systems, the RAM used by LittleFS does not depend on the file-system size (it is said "RAM bounded" without RAM allocation overflow). See [https://github.com/littlefs-project/littlefs LittleFS Github] for more information.  

LittleFS is a flash-based device filesystem. It has been designed to be more resistant to filesystem corruption and power failures resilient. Unless other file-systems, the RAM used by LittleFS does not depend on the file-system size (it is said "RAM bounded" without RAM allocation overflow). See [https://github.com/littlefs-project/littlefs LittleFS Github] for more information.  

So, even if LittleFS do have some minimal buffering, it is possible to force writing to the flah ( with {{fname|flush()}} ). So the user code can rely on better file-system stability and better control over forced writing operation.

So, even if LittleFS do have minimal buffering, it is possible to force writing to the flash ( with {{fname|flush()}} ) to ensure minimal data lost in case of issue. So the user code can rely on better file-system stability and better control over forced writing operation.

The following example just {{fname|flush()}} writes at every line written to the file.  

The following example just {{fname|flush()}} writes at every line written to the file.  

[[Fichier:LittleFS-flushed.png|640px]]

[[Fichier:LittleFS-flushed.png|640px]]

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