28 lines
1.2 KiB
Markdown
28 lines
1.2 KiB
Markdown
# Wear levelling example
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This example demonstrates how to use wear levelling library and FATFS library to store files in a partition inside SPI flash. Example does the following steps:
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1. Use an "all-in-one" `esp_vfs_fat_spiflash_mount` function to:
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- find a partition in SPI flash,
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- initialize wear levelling library using this partition
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- mount FAT filesystem using FATFS library (and format the filesystem, if the filesystem can not be mounted),
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- register FAT 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. Open 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 typical example console output.
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```
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I (280) example: Mounting FAT filesystem
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W (440) vfs_fat_spiflash: f_mount failed (13)
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I (440) vfs_fat_spiflash: Formatting FATFS partition, allocation unit size=4096
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I (660) vfs_fat_spiflash: Mounting again
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I (660) example: Opening file
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I (910) example: File written
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I (910) example: Reading file
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I (920) example: Read from file: 'written using ESP-IDF v3.1-dev-171-gf9ad17eee-dirty'
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I (920) example: Unmounting FAT filesystem
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I (1000) example: Done
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```
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