添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/storage/spiffs/README.md

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+# SPIFFS example
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+This example demonstrates how to use SPIFFS with ESP32. Example does the following steps:
+
+1. Use an "all-in-one" `esp_vfs_spiffs_register` function to:
+    - initialize SPIFFS,
+    - mount SPIFFS filesystem using SPIFFS library (and format, if the filesystem can not be mounted),
+    - register SPIFFS 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. Rename the file. Before renaming, check if destination file already exists using `stat` function, and remove it using `unlink` function.
+4. Open renamed file for reading, read back the line, and print it to the terminal.
+
+SPIFFS 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
+
+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 example console output. In this case `format_if_mount_failed` parameter was set to `true` in the source code. SPIFFS was unformatted, so the initial mount has failed. SPIFFS was then formatted, and mounted again.
+
+```
+I (324) example: Initializing SPIFFS
+W (324) SPIFFS: mount failed, -10025. formatting...
+I (19414) example: Partition size: total: 896321, used: 0
+I (19414) example: Opening file
+I (19504) example: File written
+I (19544) example: Renaming file
+I (19584) example: Reading file
+I (19584) example: Read from file: 'Hello World!'
+I (19584) example: SPIFFS unmounted
+```
+
+To erase the contents of SPIFFS partition, run `idf.py erase_flash` command. Then upload the example again as described above.