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audio.py

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+from machine import I2S, Pin
+import struct
+import time
+import math
+from config import CURRENT_CONFIG
+
+class AudioPlayer:
+    def __init__(self):
+        self.i2s = None
+        self.config = None
+        if hasattr(CURRENT_CONFIG, 'audio') and CURRENT_CONFIG.audio.get('enabled', False):
+            self.config = CURRENT_CONFIG.audio
+            self._init_audio()
+        else:
+            print("Audio not enabled in config")
+
+    def _init_audio(self):
+        """初始化音频输出"""
+        # 从配置中获取引脚
+        bck = self.config.get('bck')
+        ws = self.config.get('ws')
+        sd = self.config.get('sd')
+        sample_rate = self.config.get('sample_rate', 24000)
+        
+        print(f"Init Speaker: BCK={bck}, WS={ws}, SD={sd}")
+        try:
+            # MAX98357A 配置尝试：
+            # 使用 I2S.STEREO 格式通常更稳定，MAX98357A 会自动混合 L+R
+            self.i2s = I2S(
+                0,
+                sck=Pin(bck),
+                ws=Pin(ws),
+                sd=Pin(sd),
+                mode=I2S.TX,
+                bits=16,
+                format=I2S.STEREO, # 修改为 STEREO
+                rate=sample_rate,
+                ibuf=20000,
+            )
+        except Exception as e:
+            print(f"Speaker init failed: {e}")
+            self.i2s = None
+
+    def play_tone(self, frequency, duration_ms, volume=0.5):
+        """播放指定频率的音调"""
+        if self.i2s is None: return
+        
+        sample_rate = self.config.get('sample_rate', 24000)
+        n_samples = int(sample_rate * duration_ms / 1000)
+        amplitude = int(32767 * volume)
+        
+        # STEREO: 每个采样 2 个声道 (L+R)，每个声道 2 字节 (16-bit) -> 4 字节/帧
+        buffer = bytearray(n_samples * 4)
+        if frequency > 0:
+            period = sample_rate // frequency
+            half_period = period // 2
+            
+            for i in range(n_samples):
+                # 方波：前半周期高电平，后半周期低电平
+                sample = amplitude if (i % period) < half_period else -amplitude
+                # 左声道
+                struct.pack_into('<h', buffer, i * 4, sample)
+                # 右声道
+                struct.pack_into('<h', buffer, i * 4 + 2, sample)
+        else:
+            # 静音，缓冲区默认为0
+            pass
+
+        try:
+            # 写入多次以确保缓冲区填满并开始播放
+            self.i2s.write(buffer) 
+        except Exception as e:
+            print(f"Write error: {e}")
+
+    def play_mario(self):
+        """播放马里奥主题曲片段"""
+        if self.i2s is None: return
+
+        print(">>> Playing Mario Theme...")
+        
+        # Note frequencies
+        NOTE_E5 = 659
+        NOTE_C5 = 523
+        NOTE_G5 = 784
+        NOTE_G4 = 392
+        
+        # (frequency, duration_ms)
+        # 马里奥主题曲开头
+        melody = [
+            (NOTE_E5, 150), (NOTE_E5, 150), (0, 150), (NOTE_E5, 150), 
+            (0, 150), (NOTE_C5, 150), (NOTE_E5, 150), (0, 150),
+            (NOTE_G5, 150), (0, 450), 
+            (NOTE_G4, 150), (0, 450)
+        ]
+        
+        for freq, duration in melody:
+            if freq == 0:
+                time.sleep_ms(duration)
+            else:
+                self.play_tone(freq, duration, 0.3)
+                # 短暂的停顿，避免音符粘连
+                time.sleep_ms(10)
+
+class Microphone:
+    def __init__(self):
+        self.i2s = None
+        self.config = None
+        if hasattr(CURRENT_CONFIG, 'mic') and CURRENT_CONFIG.mic.get('enabled', False):
+            self.config = CURRENT_CONFIG.mic
+            self._init_mic()
+        else:
+            print("Mic not enabled in config")
+
+    def _init_mic(self):
+        """初始化麦克风"""
+        # 从配置中获取引脚
+        sck = self.config.get('sck')
+        ws = self.config.get('ws')
+        sd = self.config.get('sd')
+        sample_rate = self.config.get('sample_rate', 16000)
+        
+        print(f"Init Mic: SCK={sck}, WS={ws}, SD={sd}")
+        try:
+            self.i2s = I2S(
+                1,
+                sck=Pin(sck),
+                ws=Pin(ws),
+                sd=Pin(sd),
+                mode=I2S.RX,
+                bits=32, # ICS-43434 需要 32位 时钟周期
+                format=I2S.MONO,
+                rate=sample_rate,
+                ibuf=20000,
+            )
+        except Exception as e:
+            print(f"Mic init failed: {e}")
+            self.i2s = None
+            
+    def readinto(self, buf):
+        """读取数据到缓冲区"""
+        if self.i2s:
+            return self.i2s.readinto(buf)
+        return 0