添加智能灯固件代码

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

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

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

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+#
+# Main Makefile. This is basically the same as a component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
+

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/sigmadelta/main/sigmadelta_example_main.c

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+/* Sigma-delta 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 "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_system.h"
+#include "driver/sigmadelta.h"
+/*
+ * This test code will configure sigma-delta and set GPIO4 as a signal output pin.
+ * If you connect this GPIO4 with a LED, you will see the LED blinking slowly.
+ */
+
+/*
+ * Configure and initialize the sigma delta modulation
+ * on channel 0 to output signal on GPIO4
+ */
+static void sigmadelta_example_init(void)
+{
+    sigmadelta_config_t sigmadelta_cfg = {
+        .channel = SIGMADELTA_CHANNEL_0,
+        .sigmadelta_prescale = 80,
+        .sigmadelta_duty = 0,
+        .sigmadelta_gpio = GPIO_NUM_4,
+    };
+    sigmadelta_config(&sigmadelta_cfg);
+}
+
+/*
+ *  Perform the sigma-delta modulation test
+ *  by changing the duty of the output signal.
+ */
+void app_main(void)
+{
+    sigmadelta_example_init();
+
+    int8_t duty = 0;
+    int inc = 1;
+    while (1) {
+        sigmadelta_set_duty(SIGMADELTA_CHANNEL_0, duty);
+        /* By changing delay time, you can change the blink frequency of LED */
+        vTaskDelay(10 / portTICK_PERIOD_MS);
+
+        duty += inc;
+        if (duty == 127 || duty == -127) {
+            inc = (-1) * inc;
+        }
+    }
+}