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35 lines
1.1 KiB
ReStructuredText
35 lines
1.1 KiB
ReStructuredText
======================
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File System Interfaces
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======================
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LVGL has a :ref:`file-system` module
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to provide an abstraction layer for various file system drivers.
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LVG has built in support for:
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- `FATFS <http://elm-chan.org/fsw/ff/00index_e.html>`__
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- STDIO (Linux and Windows using C standard function .e.g fopen, fread)
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- POSIX (Linux and Windows using POSIX function .e.g open, read)
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- WIN32 (Windows using Win32 API function .e.g CreateFileA, ReadFile)
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You still need to provide the drivers and libraries, this extension
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provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.
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Usage
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*****
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In ``lv_conf.h`` enable ``LV_USE_FS_...`` and assign an upper cased
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letter to ``LV_FS_..._LETTER`` (e.g. ``'S'``). After that you can access
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files using that driver letter. E.g. ``"S:path/to/file.txt"``.
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The work directory can be set with ``LV_FS_..._PATH``. E.g.
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``"/home/joe/projects/"`` The actual file/directory paths will be
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appended to it.
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Cached reading is also supported if ``LV_FS_..._CACHE_SIZE`` is set to
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not ``0`` value. :c:func:`lv_fs_read` caches this size of data to lower the
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number of actual reads from the storage.
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API
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***
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