ESP32使用Audio.h库利用内部DAC播放SD卡的MP3文件的代码编写思路

1. 导入所需库文件

#include <Arduino.h>
#include "FS.h"
#include "SD.h"
#include "SPI.h"
#include "Audio.h"

2. 设置SD卡引脚和SPI引脚

#define SD_CS_PIN 5
#define SPI_CLK_PIN 18
#define SPI_MISO_PIN 19
#define SPI_MOSI_PIN 23

3. 初始化SD卡和SPI

if(!SD.begin(SD_CS_PIN)) {
  Serial.println("SD Card Mount Failed");
  return;
}
SPI.begin(SPI_CLK_PIN, SPI_MISO_PIN, SPI_MOSI_PIN);

4. 设置Audio输出引脚

AudioOutI2S audioOutput;
audioOutput.SetPinout(26, 25, 22);

5. 打开MP3文件

File mp3File = SD.open("/test.mp3");
if(!mp3File) {
  Serial.println("Error opening file");
  return;
}

6. 创建Audio播放器对象并开始播放

AudioGeneratorMP3 audioPlayer;
audioPlayer.begin(mp3File, audioOutput);
while(audioPlayer.isPlaying()) {
  audioPlayer.loop();
}

完整代码示例：

#include <Arduino.h>
#include "FS.h"
#include "SD.h"
#include "SPI.h"
#include "Audio.h"

#define SD_CS_PIN 5
#define SPI_CLK_PIN 18
#define SPI_MISO_PIN 19
#define SPI_MOSI_PIN 23

void setup() {
  Serial.begin(115200);

  if(!SD.begin(SD_CS_PIN)) {
    Serial.println("SD Card Mount Failed");
    return;
  }
  SPI.begin(SPI_CLK_PIN, SPI_MISO_PIN, SPI_MOSI_PIN);

  AudioOutI2S audioOutput;
  audioOutput.SetPinout(26, 25, 22);

  File mp3File = SD.open("/test.mp3");
  if(!mp3File) {
    Serial.println("Error opening file");
    return;
  }

  AudioGeneratorMP3 audioPlayer;
  audioPlayer.begin(mp3File, audioOutput);
  while(audioPlayer.isPlaying()) {
    audioPlayer.loop();
  }
}

void loop() {
  
}