esp32（1）声音控制基本代码

 

ESP-32开发板WIFI+蓝牙2合1双核CPU低功耗ESP32 ESP-32S

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INMP441全向麦克风模块 MEMS 高精度 低功耗 I2S接口支持ESP32-S3

 

接口定义：

SCK：I²S接口的串行数据时钟

WS ：用于I²S接口的串行数据字选择

L/R：左/右声道选择。一般接地

设置为低电平时，麦克风在I²S帧的左声道输出信号。

设置为高电平时，麦克风在右声道输出信号

SD：I²S接口的串行数据输出。

VCC：输入电源，1.8V至3.3V.

GND:电源地

 只是参考不同的板子接线不一样

 

 

 INMP441      ESP32开发板

1. #define I2S_MIC_WS 25   // INMP441 WS (LRCLK)

   #define I2S_MIC_SD 33   // INMP441 SD (DOUT)

   #define I2S_MIC_SCK 32  // INMP441 SCK (BCLK)
2. L/R    >> GND
3. GND   >> GND
4. VDD   >> VDD3.3

 

MAX98357 I2S 音频放大器模块 无滤波D类放大支持ESP32-S3 树莓pi

 

 

 

 

 

代码

 

#include <driver/i2s.h>

// 引脚定义
#define I2S_MIC_WS 25   // INMP441 WS (LRCLK)
#define I2S_MIC_SD 33   // INMP441 SD (DOUT)
#define I2S_MIC_SCK 32  // INMP441 SCK (BCLK)

#define I2S_SPK_WS 26   // MAX98357 LRCLK
#define I2S_SPK_DOUT 27 // MAX98357 DIN
#define I2S_SPK_BCLK 14 // MAX98357 BCLK

// I2S配置
#define SAMPLE_RATE 44100
#define SAMPLE_BITS 16
#define BUFFER_SIZE 1024

void setup() {
  Serial.begin(115200);
  
  // 初始化I2S麦克风输入
  i2s_config_t mic_i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = (i2s_bits_per_sample_t)SAMPLE_BITS,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = BUFFER_SIZE,
    .use_apll = false,
    .tx_desc_auto_clear = false,
    .fixed_mclk = 0
  };
  
  i2s_pin_config_t mic_pin_config = {
    .mck_io_num = I2S_PIN_NO_CHANGE,
    .bck_io_num = I2S_MIC_SCK,
    .ws_io_num = I2S_MIC_WS,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_MIC_SD
  };
  
  i2s_driver_install(I2S_NUM_0, &mic_i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM_0, &mic_pin_config);
  
  // 初始化I2S扬声器输出
  i2s_config_t spk_i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = (i2s_bits_per_sample_t)SAMPLE_BITS,
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
    .dma_buf_count = 8,
    .dma_buf_len = BUFFER_SIZE,
    .use_apll = false,
    .tx_desc_auto_clear = false,
    .fixed_mclk = 0
  };
  
  i2s_pin_config_t spk_pin_config = {
    .mck_io_num = I2S_PIN_NO_CHANGE,
    .bck_io_num = I2S_SPK_BCLK,
    .ws_io_num = I2S_SPK_WS,
    .data_out_num = I2S_SPK_DOUT,
    .data_in_num = I2S_PIN_NO_CHANGE
  };
  
  i2s_driver_install(I2S_NUM_1, &spk_i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM_1, &spk_pin_config);
  
  Serial.println("I2S初始化完成，开始音频回环...");
}

void loop() {
  int16_t audio_buffer[BUFFER_SIZE];
  size_t bytes_read;
  
  // 从麦克风读取数据
  i2s_read(I2S_NUM_0, audio_buffer, sizeof(audio_buffer), &bytes_read, portMAX_DELAY);
  
  // 将数据写入扬声器
  size_t bytes_written;
  i2s_write(I2S_NUM_1, audio_buffer, bytes_read, &bytes_written, portMAX_DELAY);
  
  // 可选：打印一些调试信息
  static unsigned long last_print = 0;
  if (millis() - last_print > 1000) {
    Serial.printf("音频处理中... 缓冲区大小: %d\n", bytes_read);
    last_print = millis();
  }
}