mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
55 lines
2.7 KiB
Markdown
55 lines
2.7 KiB
Markdown
|
| Supported Targets | ESP32 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
|
||
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
|
||
|
|
|
||
|
|
# NVS Partition 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 NVS image generation tool [nvs_partition_gen.py](../../../components/nvs_flash/nvs_partition_generator/nvs_partition_gen.py) to automatically create a NVS partition image from the contents of a CSV file 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 `nvs_partition_gen.py` on the ESP-IDF Programming Guide under API Reference > Storage API > NVS Partition Generator Utility.
|
||
|
|
|
||
|
|
The following gives an overview of the example:
|
||
|
|
|
||
|
|
1. There is a file `nvs_data.csv` from which the NVS partition image will be created.
|
||
|
|
|
||
|
|
2. The function `nvs_create_partition_image` is used to specify that a NVS image should be created during build for the `nvs` 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 `nvs.bin`.
|
||
|
|
|
||
|
|
3. Upon invocation of `idf.py -p PORT flash monitor`, application loads and finds there is already a valid and pre-filled NVS partition in the `nvs` partition with values same as those in `nvs_data.csv` file. The application is then able to read those values.
|
||
|
|
|
||
|
|
## 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 (357) example: Opening Non-Volatile Storage (NVS) handle
|
||
|
|
I (357) example: Done
|
||
|
|
I (357) example: Reading values from NVS
|
||
|
|
255
|
||
|
|
-128
|
||
|
|
65535
|
||
|
|
4294967295
|
||
|
|
-2147483648
|
||
|
|
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
|
||
|
|
Fusce quis risus justo.
|
||
|
|
Suspendisse egestas in nisi sit amet auctor.
|
||
|
|
Pellentesque rhoncus dictum sodales.
|
||
|
|
In justo erat, viverra at interdum eget, interdum vel dui.
|
||
|
|
I (387) example: Reading values from NVS done - all OK
|
||
|
|
```
|
||
|
|
|
||
|
|
The logic of the example is contained in a [single source file](./main/nvsgen_example_main.c), and it should be relatively simple to match points in its execution with the log outputs above.
|