Arduino编译报错求助：'PCM'未定义等多类编译错误

错误分析与解决步骤 #

1. 核心错误：'PCM' does not name a type #

这是引发后续所有错误的根源，原因包括：

• 未安装对应PCM音频库，或安装的库与代码预期不匹配
• 库文件路径错误，Arduino IDE无法找到PCM.h头文件

解决方法：

• 打开Arduino IDE，通过「项目」→「加载库」→「管理库」搜索PCM，选择支持PROGMEM音频播放的官方/主流库完成安装
• 若手动添加库，确保PCM.h文件放置在Arduino库目录下，且头文件内正确声明了PCM类

2. 'player' was not declared in this scope #

此错误是PCM类型未被识别导致的连锁问题，解决第一个错误后，该问题会自动消失。

3. 'analogWriteResolution' was not declared in this scope #

analogWriteResolution()仅支持ESP32、Arduino Due/Zero等特定型号板卡，普通AVR架构板卡（如Uno、Nano）无此函数。

解决方法：

• 若使用AVR板卡，直接删除以下代码：

  Serial.println(F("PWM supported: "));
  Serial.println(analogWriteResolution(12)); //checking PWM support for pin 12
  

• 若使用支持该函数的板卡，确认工具菜单中已选择正确的开发板型号

额外代码补全 #

代码中audio4至audio10未定义，需补全这些音频数组的内容，否则编译仍会报错：

const char audio4[] PROGMEM = { ... };
const char audio5[] PROGMEM = { ... };
// ... 依次补全到audio10

修复后示例代码 #

#include <PCM.h>
#include <avr/pgmspace.h>

const int numButtons = 10;
const int buttons[numButtons] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
const int numAudioFiles = 10;

// 补全所有音频数组定义
const char audio1[] PROGMEM = { ... };
const char audio2[] PROGMEM = { ... };
const char audio3[] PROGMEM = { ... };
const char audio4[] PROGMEM = { ... };
const char audio5[] PROGMEM = { ... };
const char audio6[] PROGMEM = { ... };
const char audio7[] PROGMEM = { ... };
const char audio8[] PROGMEM = { ... };
const char audio9[] PROGMEM = { ... };
const char audio10[] PROGMEM = { ... };

const char* audioFiles[numAudioFiles] = {audio1, audio2, audio3, audio4, audio5, audio6, audio7, audio8, audio9, audio10};
PCM player;

void setup() {
  for (int i = 0; i < numButtons; i++) {
    pinMode(buttons[i], INPUT);
  }
  player.setPin(12);
  player.begin();
  Serial.begin(9600); // 如需串口输出，需添加初始化代码
}

void loop() {
  for (int i = 0; i < numButtons; i++) {
    if (digitalRead(buttons[i]) == HIGH) {
      player.play_P(audioFiles[i]);
      while (player.isPlaying());
    }
  }
}

内容的提问来源于stack exchange，提问作者Akshay Dixit