添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/README.md

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+# UART Select Example
+
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
+
+The UART select example is for demonstrating the use of `select()` for
+synchronous I/O multiplexing on the UART interface. The example waits for a
+character from UART using `select()` until a blocking read without delay or a
+successful non-blocking read is possible.
+
+Please note that the same result can be achieved by using `uart_read_bytes()`
+but the use of `select()` allows to use it together with other virtual
+file system (VFS) drivers, e.g. LWIP sockets.
+
+This example can be used to develop applications for non-blocking read and write from/to various sources (UART,
+sockets, ...) where a ready resource can be served without being blocked by a busy resource.
+
+For a more comprehensive example please refer to `system/select`.
+
+## How to use example
+
+### Hardware Required
+
+The example can be run on any ESP32 development board connected to a PC with a single USB cable for communication
+through UART.
+
+### Configure the project
+
+```
+idf.py menuconfig
+```
+
+### 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
+```
+
+(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
+
+You can see a similar output after flashing and monitoring the application:
+
+```
+...
+I (276) cpu_start: Pro cpu start user code
+I (294) cpu_start: Starting scheduler on PRO CPU.
+I (0) cpu_start: Starting scheduler on APP CPU.
+I (10295) uart_select_example: Timeout has been reached and nothing has been received
+I (15295) uart_select_example: Timeout has been reached and nothing has been received
+I (20295) uart_select_example: Timeout has been reached and nothing has been received
+```
+
+You can push any key on your keyboard to see the result of a successful detection by `select()` and subsequent
+blocking read (without delay). The following output shows the result of pushing `a` on the keyboard:
+
+```
+...
+I (15295) uart_select_example: Timeout has been reached and nothing has been received
+I (20295) uart_select_example: Timeout has been reached and nothing has been received
+I (20945) uart_select_example: Received: a
+I (25955) uart_select_example: Timeout has been reached and nothing has been received
+...
+```