mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
57 lines
2.6 KiB
Markdown
57 lines
2.6 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | -------- | -------- | -------- |
|
|
|
|
# SPIFFS Image Generation on Build Example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
This example demonstrates how to use the SPIFFS image generation tool [spiffsgen.py](../../../components/spiffs/spiffsgen.py) to automatically create a SPIFFS
|
|
filesystem image from the contents of a host folder during build, with an option of
|
|
automatically flashing the created image on invocation of `idf.py -p PORT flash`.
|
|
For more information, see description of `spiffsgen.py` on the ESP-IDF Programming Guide under API Reference > Storage > SPIFFS Filesystem.
|
|
|
|
The following gives an overview of the example:
|
|
|
|
1. There is a directory `spiffs_image` from which the SPIFFS filesystem image will be created.
|
|
|
|
2. The function `spiffs_create_partition_image` is used to specify that a SPIFFS image
|
|
should be created during build for the `storage` partition. It is called from [the main component's CMakeLists.txt](./main/CMakeLists.txt).
|
|
`FLASH_IN_PROJECT` specifies that the created image
|
|
should be flashed on invocation of `idf.py -p PORT flash` together with app, bootloader, partition table, etc.
|
|
For both build systems, the image is created on the example's build directory with the output filename `storage.bin`.
|
|
|
|
3. Upon invocation of `idf.py -p PORT flash monitor`, application loads and
|
|
finds there is already a valid SPIFFS filesystem in the `storage` partition with files same as those in `spiffs_image` directory. The application is then
|
|
able to read those files.
|
|
|
|
## How to use example
|
|
|
|
### Build and flash
|
|
|
|
To run the example, type the following command:
|
|
|
|
```CMake
|
|
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 the example's console output:
|
|
|
|
```
|
|
...
|
|
I (10) example: Initializing SPIFFS
|
|
I (110) example: Partition size: total: 896321, used: 171935
|
|
I (110) example: Reading hello.txt
|
|
I (110) example: Read from hello.txt: Hello World!
|
|
I (110) example: Computing alice.txt MD5 hash
|
|
I (330) example: Computed MD5 hash of alice.txt: deeb71f585cbb3ae5f7976d5127faf2a
|
|
I (330) example: SPIFFS unmounted
|
|
```
|
|
|
|
The logic of the example is contained in a [single source file](./main/spiffsgen_example_main.c), and it should be relatively simple to match points in its execution with the log outputs above.
|