添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/i2s/main/CMakeLists.txt

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+idf_component_register(SRCS "i2s_example_main.c"
+                    INCLUDE_DIRS ".")

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/i2s/main/component.mk

@@ -0,0 +1,6 @@
+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
+
+COMPONENT_ADD_INCLUDEDIRS := .

firmware/esp-idf/wumei-smart-firmware/examples/peripherals/i2s/main/i2s_example_main.c

@@ -0,0 +1,119 @@
+/* I2S Example
+
+    This example code will output 100Hz sine wave and triangle wave to 2-channel of I2S driver
+    Every 5 seconds, it will change bits_per_sample [16, 24, 32] for i2s data
+
+    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 "driver/i2s.h"
+#include "driver/gpio.h"
+#include "esp_system.h"
+#include <math.h>
+
+
+#define SAMPLE_RATE     (36000)
+#define I2S_NUM         (0)
+#define WAVE_FREQ_HZ    (100)
+#define PI              (3.14159265)
+#define I2S_BCK_IO      (GPIO_NUM_13)
+#define I2S_WS_IO       (GPIO_NUM_15)
+#define I2S_DO_IO       (GPIO_NUM_21)
+#define I2S_DI_IO       (-1)
+
+#define SAMPLE_PER_CYCLE (SAMPLE_RATE/WAVE_FREQ_HZ)
+
+static void setup_triangle_sine_waves(int bits)
+{
+    int *samples_data = malloc(((bits+8)/16)*SAMPLE_PER_CYCLE*4);
+    unsigned int i, sample_val;
+    double sin_float, triangle_float, triangle_step = (double) pow(2, bits) / SAMPLE_PER_CYCLE;
+    size_t i2s_bytes_write = 0;
+
+    printf("\r\nTest bits=%d free mem=%d, written data=%d\n", bits, esp_get_free_heap_size(), ((bits+8)/16)*SAMPLE_PER_CYCLE*4);
+
+    triangle_float = -(pow(2, bits)/2 - 1);
+
+    for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
+        sin_float = sin(i * 2 * PI / SAMPLE_PER_CYCLE);
+        if(sin_float >= 0)
+            triangle_float += triangle_step;
+        else
+            triangle_float -= triangle_step;
+
+        sin_float *= (pow(2, bits)/2 - 1);
+
+        if (bits == 16) {
+            sample_val = 0;
+            sample_val += (short)triangle_float;
+            sample_val = sample_val << 16;
+            sample_val += (short) sin_float;
+            samples_data[i] = sample_val;
+        } else if (bits == 24) { //1-bytes unused
+            samples_data[i*2] = ((int) triangle_float) << 8;
+            samples_data[i*2 + 1] = ((int) sin_float) << 8;
+        } else {
+            samples_data[i*2] = ((int) triangle_float);
+            samples_data[i*2 + 1] = ((int) sin_float);
+        }
+
+    }
+
+    i2s_set_clk(I2S_NUM, SAMPLE_RATE, bits, 2);
+    //Using push
+    // for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
+    //     if (bits == 16)
+    //         i2s_push_sample(0, &samples_data[i], 100);
+    //     else
+    //         i2s_push_sample(0, &samples_data[i*2], 100);
+    // }
+    // or write
+    i2s_write(I2S_NUM, samples_data, ((bits+8)/16)*SAMPLE_PER_CYCLE*4, &i2s_bytes_write, 100);
+
+    free(samples_data);
+}
+
+void app_main(void)
+{
+    //for 36Khz sample rates, we create 100Hz sine wave, every cycle need 36000/100 = 360 samples (4-bytes or 8-bytes each sample)
+    //depend on bits_per_sample
+    //using 6 buffers, we need 60-samples per buffer
+    //if 2-channels, 16-bit each channel, total buffer is 360*4 = 1440 bytes
+    //if 2-channels, 24/32-bit each channel, total buffer is 360*8 = 2880 bytes
+    i2s_config_t i2s_config = {
+        .mode = I2S_MODE_MASTER | I2S_MODE_TX,                                  // Only TX
+        .sample_rate = SAMPLE_RATE,
+        .bits_per_sample = 16,
+        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,                           //2-channels
+        .communication_format = I2S_COMM_FORMAT_STAND_MSB,
+        .dma_buf_count = 6,
+        .dma_buf_len = 60,
+        .use_apll = false,
+        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1                                //Interrupt level 1
+    };
+    i2s_pin_config_t pin_config = {
+        .bck_io_num = I2S_BCK_IO,
+        .ws_io_num = I2S_WS_IO,
+        .data_out_num = I2S_DO_IO,
+        .data_in_num = I2S_DI_IO                                               //Not used
+    };
+    i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
+    i2s_set_pin(I2S_NUM, &pin_config);
+
+    int test_bits = 16;
+    while (1) {
+        setup_triangle_sine_waves(test_bits);
+        vTaskDelay(5000/portTICK_RATE_MS);
+        test_bits += 8;
+        if(test_bits > 32)
+            test_bits = 16;
+
+    }
+
+}