Lines Matching refs:is
8 any type of file system. A file system is identified by an assigned
9 identifier letter. For example, if an SD card is associated with the letter
34 As mentioned above, a file system is identified by an assigned identifier letter.
35 This identifier is merely a way for the LVGL File System abtraction logic to look up
42 or the character '/'. See :ref:`lv_fs_adding_a_driver` for how this is done.
78 - "Z:/Users/me/wip/proposal.txt" (if the default drive is known to be C:)
84 "Z:" is used to look up the driver for that file system in the list of all file-system
100 its contents need to remain valid as long as the driver is in use.
110 drv.ready_cb = my_ready_cb; /* Callback to tell if the drive is ready to use */
126 Any of the callbacks can be ``NULL`` to indicate that operation is not
141 ``path`` is the path after the drive letter (e.g. "S:path/to/file.txt" -> "path/to/file.txt").
144 The return value is a pointer to a *file object* that describes the
159 For ``file_p``, LVGL passes the return value of ``open_cb``, ``buf`` is
160 the data to write, ``btw`` is the number of "bytes to write", ``bw`` is the number of
166 one you need is not already provided.
270 /* fn is empty if there are no more files to read. */
304 config option is set to a value greater than zero. Each open file will
308 of access patterns. The one implemented here is optimal for reading large
309 files in chunks, which is what the image decoder does.
311 times than ``lv_fs_read`` is called. In the best case where the cache size is
312 \>= the size of the file, ``read`` will only be called once. This strategy is good
316 is if the file contents are expected to change by an external factor like with special OS files.
318 The implementation is documented below. Note that the FS functions make calls
319 to other driver FS functions when the cache is enabled. i.e., ``lv_fs_read`` may call the driver's …
320 so the driver needs to implement more callbacks when the cache is enabled.
322 ``lv_fs_read`` :sub:`(behavior when cache is enabled)`
331 the cache is enabled"] --> B{{"is there cached data
344 --> H{{"is the number of remaining bytes
357 --> L{{"is the number of required
369 ``lv_fs_write`` :sub:`(behavior when cache is enabled)`
375 ``lv_fs_seek`` :sub:`(behavior when cache is enabled)`
379 is ``LV_FS_SEEK_END``, in which case ``seek`` and ``tell`` will be called
380 to determine where the end of the file is.
382 ``lv_fs_tell`` :sub:`(behavior when cache is enabled)`