mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
58 lines
2.3 KiB
Markdown
58 lines
2.3 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |
|
|
|
|
# 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:
|
|
|
|
1. Use an "all-in-one" `esp_vfs_fat_spiflash_mount_rw_wl` 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.
|
|
|
|
Wear levelling partition size is set in partitions_example.csv file. See [Partition Tables](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/partition-tables.html) 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.
|
|
|
|
### Build and flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
idf.py -p PORT flash monitor
|
|
```
|
|
|
|
(Replace PORT with serial port name.)
|
|
|
|
(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 a 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 `idf.py erase-flash` command. Then upload the example again as described above.
|