esp-idf/examples/storage/wear_levelling/README.md

# SD Card example

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:

1. Use an "all-in-one" `esp_vfs_fat_spiflash_mount` function to:
    - find a partition in SPI flash,
    - initialize wear levelling library using this partition
    - mount FAT filesystem using FATFS library (and format the filesystem, if the filesystem can not be mounted),
    - register FAT filesystem in VFS, enabling C standard library and POSIX functions to be used.
2. Create a file using `fopen` and write to it using `fprintf`.
3. Open file for reading, read back the line, and print it to the terminal.

## Example output

Here is an typical example console output. 

```
Try to open file ...
I (239) wear_level: Reading file
Read from file: 'Hello User! I'm happy to see you!1'
W (239) wear_levelling: wl_unmount Delete driver
```