59 lines
2.5 KiB
Markdown
59 lines
2.5 KiB
Markdown
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# SPIFFS Image Generation on Build Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example demonstrates how to use the SPIFFS image generation tool [spiffsgen.py](../../../components/spiffs/spiffsgen.py) to automatically create a SPIFFS
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filesystem image from the contents of a host folder during build, with an option of
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automatically flashing the created image on invocation of `idf.py flash` or `make flash`.
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For more information, see description of `spiffsgen.py` on the ESP-IDF Programming Guide under API Reference > Storage > SPIFFS Filesystem.
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The following gives an overview of the example:
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1. There is a directory `spiffs_image` from which the SPIFFS filesystem image will be created.
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2. The function `spiffs_create_partition_image` is used to specify that a SPIFFS image
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should be created during build for the `storage` partition. For CMake, it is called from [the main component's CMakeLists.txt](./main/CMakeLists.txt);
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for Make, from the [project Makefile](./Makefile). `FLASH_IN_PROJECT` specifies that the created image
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should be flashed on invocation of `idf.py flash` or `make flash` together with app, bootloader, partition table, etc.
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For both build systems, the image is created on the example's build directory with the output filename `storage.bin`.
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3. Upon invocation of `idf.py flash monitor` or `make flash monitor`, application loads and
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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
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able to read those files.
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## How to use example
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### Build and flash
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To run the example, type the following command:
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```Makefile
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# Make
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make flash monitor
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```
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or
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```CMake
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# CMake
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idf.py flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example output
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Here is the example's console output:
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```
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...
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I (10) example: Initializing SPIFFS
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I (110) example: Partition size: total: 896321, used: 171935
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I (110) example: Reading hello.txt
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I (110) example: Read from hello.txt: Hello World!
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I (110) example: Computing alice.txt MD5 hash
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I (330) example: Computed MD5 hash of alice.txt: deeb71f585cbb3ae5f7976d5127faf2a
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I (330) example: SPIFFS unmounted
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```
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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.
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