「App:Library:LVGL:docs:3rd party libraries:File System Interfaces」の版間の差分

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https://docs.lvgl.io/8.2/libs/fsdrv.html
 
https://docs.lvgl.io/8.2/libs/fsdrv.html
 
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= File System Interfaces =
 
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= File System Interfaces =
 
 
LVGL has a File system module to provide an abstraction layer for various file system drivers.
 
LVGL has a File system module to provide an abstraction layer for various file system drivers.
  
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You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.
 
You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.
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== Usage ==
 
== Usage ==
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In <code>lv_conf.h</code> enable <code>LV_USE_FS_...</code> and assign an upper cased letter to <code>LV_FS_..._LETTER</code> (e.g. <code>'S'</code>). After that you can access files using that driver letter. E.g. <code>"S:path/to/file.txt"</code>.
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The work directory can be set with <code>LV_FS_..._PATH</code>. E.g. <code>"/home/joe/projects/"</code> The actual file/directory paths will be appended to it.
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Cached reading is also supported if <code>LV_FS_..._CACHE_SIZE</code> is set to not <code>0</code> value. <code>lv_fs_read</code> caches this size of data to lower the number of actual reads from the storage.
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In <code style="color: #bb0000;">lv_conf.h</code> enable <code style="color: #bb0000;">LV_USE_FS_...</code> and assign an upper cased letter to <code style="color: #bb0000;">LV_FS_..._LETTER</code> (e.g. <code style="color: #bb0000;">'S'</code>). After that you can access files using that driver letter. E.g. <code style="color: #bb0000;">"S:path/to/file.txt"</code>.
  
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The work directory can be set with <code style="color: #bb0000;">LV_FS_..._PATH</code>. E.g. <code style="color: #bb0000;">"/home/joe/projects/"</code> The actual file/directory paths will be appended to it.
  
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Cached reading is also supported if <code style="color: #bb0000;">LV_FS_..._CACHE_SIZE</code> is set to not <code style="color: #bb0000;">0</code> value. <code style="color: #bb0000;">lv_fs_read</code> caches this size of data to lower the number of actual reads from the storage.
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:[[App:Library:LVGL:docs:3rd party libraries|戻る : Previous]]
 
:[[App:Library:LVGL:docs:3rd party libraries|戻る : Previous]]

2022年6月29日 (水) 15:05時点における版

https://docs.lvgl.io/8.2/libs/fsdrv.html

File System Interfaces

英文 自動翻訳

LVGL has a File system module to provide an abstraction layer for various file system drivers.

LVG has built in support for:

  • FATFS
  • STDIO (Linux and Windows using C standard function .e.g fopen, fread)
  • POSIX (Linux and Windows using POSIX function .e.g open, read)
  • WIN32 (Windows using Win32 API function .e.g CreateFileA, ReadFile)

You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.


Usage

英文 自動翻訳

In lv_conf.h enable LV_USE_FS_... and assign an upper cased letter to LV_FS_..._LETTER (e.g. 'S'). After that you can access files using that driver letter. E.g. "S:path/to/file.txt".

The work directory can be set with LV_FS_..._PATH. E.g. "/home/joe/projects/" The actual file/directory paths will be appended to it.

Cached reading is also supported if LV_FS_..._CACHE_SIZE is set to not 0 value. lv_fs_read caches this size of data to lower the number of actual reads from the storage.



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