28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
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# SPIFFS example
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This example demonstrates how to use SPIFFS with ESP32. Example does the following steps:
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1. Use an "all-in-one" `esp_vfs_spiffs_register` function to:
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- initialize SPIFFS,
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- mount SPIFFS filesystem using SPIFFS library (and format, if the filesystem can not be mounted),
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- register SPIFFS filesystem in VFS, enabling C standard library and POSIX functions to be used.
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2. Create a file using `fopen` and write to it using `fprintf`.
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3. Rename the file. Before renaming, check if destination file already exists using `stat` function, and remove it using `unlink` function.
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4. Open renamed file for reading, read back the line, and print it to the terminal.
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## Example output
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Here is an example console output. In this case `format_if_mount_failed` parameter was set to `true` in the source code. SPIFFS was unformatted, so the initial mount has failed. SPIFFS was then formatted, and mounted again.
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```
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I (195) example: Initializing SPIFFS
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E (195) SPIFFS: mount failed, -10025. formatting...
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I (4525) example: Opening file
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I (4635) example: File written
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I (4685) example: Renaming file
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I (4735) example: Reading file
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I (4735) example: Read from file: 'Hello World!'
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I (4735) example: SPIFFS unmounted
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```
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