添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(uart_select)

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := uart_select
+
+include $(IDF_PATH)/make/project.mk

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
+...
+```

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/main/CMakeLists.txt

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+idf_component_register(SRCS "uart_select_example_main.c"
+                    INCLUDE_DIRS ".")

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/main/component.mk

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+#
+# Main Makefile. This is basically the same as a component makefile.
+#

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/uart/uart_select/main/uart_select_example_main.c

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+/* UART Select Example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include <stdio.h>
+#include <sys/fcntl.h>
+#include <sys/errno.h>
+#include <sys/unistd.h>
+#include <sys/select.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "esp_vfs.h"
+#include "esp_vfs_dev.h"
+#include "driver/uart.h"
+
+static const char* TAG = "uart_select_example";
+
+static void uart_select_task(void *arg)
+{
+    uart_config_t uart_config = {
+        .baud_rate = 115200,
+        .data_bits = UART_DATA_8_BITS,
+        .parity    = UART_PARITY_DISABLE,
+        .stop_bits = UART_STOP_BITS_1,
+        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+        .source_clk = UART_SCLK_APB,
+    };
+    uart_driver_install(UART_NUM_0, 2*1024, 0, 0, NULL, 0);
+    uart_param_config(UART_NUM_0, &uart_config);
+
+    while (1) {
+        int fd;
+
+        if ((fd = open("/dev/uart/0", O_RDWR)) == -1) {
+            ESP_LOGE(TAG, "Cannot open UART");
+            vTaskDelay(5000 / portTICK_PERIOD_MS);
+            continue;
+        }
+
+        // We have a driver now installed so set up the read/write functions to use driver also.
+        esp_vfs_dev_uart_use_driver(0);
+
+        while (1) {
+            int s;
+            fd_set rfds;
+            struct timeval tv = {
+                .tv_sec = 5,
+                .tv_usec = 0,
+            };
+
+            FD_ZERO(&rfds);
+            FD_SET(fd, &rfds);
+
+            s = select(fd + 1, &rfds, NULL, NULL, &tv);
+
+            if (s < 0) {
+                ESP_LOGE(TAG, "Select failed: errno %d", errno);
+                break;
+            } else if (s == 0) {
+                ESP_LOGI(TAG, "Timeout has been reached and nothing has been received");
+            } else {
+                if (FD_ISSET(fd, &rfds)) {
+                    char buf;
+                    if (read(fd, &buf, 1) > 0) {
+                        ESP_LOGI(TAG, "Received: %c", buf);
+                        // Note: Only one character was read even the buffer contains more. The other characters will
+                        // be read one-by-one by subsequent calls to select() which will then return immediately
+                        // without timeout.
+                    } else {
+                        ESP_LOGE(TAG, "UART read error");
+                        break;
+                    }
+                } else {
+                    ESP_LOGE(TAG, "No FD has been set in select()");
+                    break;
+                }
+            }
+        }
+
+        close(fd);
+    }
+
+    vTaskDelete(NULL);
+}
+
+void app_main(void)
+{
+    xTaskCreate(uart_select_task, "uart_select_task", 4*1024, NULL, 5, NULL);
+}