添加智能灯固件代码

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

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+# 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` 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.