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README.md
Wear levelling example
(See the README.md file in the upper level 'examples' directory for more information about examples.)
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:
- 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.
- Create a file using
fopen
and write to it usingfprintf
. - Open file for reading, read back the line, and print it to the terminal.
Wear levelling partition size is set in partitions_example.csv file. See Partition Tables documentation for more information.
How to use example
Hardware required
This example does not require any special hardware, and can be run on any common development board.
Configure the project
If using Make based build system, run make menuconfig
and set serial port under Serial Flasher Options.
If using CMake based build system, no configuration is required.
Build and flash
Build the project and flash it to the board, then run monitor tool to view serial output:
make -j4 flash monitor
Or, for CMake based build system (replace PORT with serial port name):
idf.py -p PORT flash monitor
(To exit the serial monitor, type Ctrl-]
.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
Example output
Here is an typical example console output.
I (280) example: Mounting FAT filesystem
W (440) vfs_fat_spiflash: f_mount failed (13)
I (440) vfs_fat_spiflash: Formatting FATFS partition, allocation unit size=4096
I (660) vfs_fat_spiflash: Mounting again
I (660) example: Opening file
I (910) example: File written
I (910) example: Reading file
I (920) example: Read from file: 'written using ESP-IDF v3.1-dev-171-gf9ad17eee-dirty'
I (920) example: Unmounting FAT filesystem
I (1000) example: Done
To erase the contents of wear levelling partition, run make erase_flash
command (or idf.py erase_flash
, if using CMake build system). Then upload the example again as described above.