ESP32 + MicroPython + 录音 + 音频播放

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功能：

1. wav音频文件本地录音，并播放
2. 录音模块：INMP441
3. 音频模块：MAX98357
4. 喇叭：3W

程序

from machine import I2S,SPI
from machine import Pinimport os, utime
import uos
import timedef createWavHeader(sampleRate, bitsPerSample, num_channels, datasize):    o = bytes("RIFF",'ascii')                                                   # (4byte) Marks file as RIFFo += (datasize + 36).to_bytes(4,'little')                                   # (4byte) File size in bytes excluding this and RIFF markero += bytes("WAVE",'ascii')                                                  # (4byte) File typeo += bytes("fmt ",'ascii')                                                  # (4byte) Format Chunk Markero += (16).to_bytes(4,'little')                                              # (4byte) Length of above format datao += (1).to_bytes(2,'little')                                               # (2byte) Format type (1 - PCM)o += (num_channels).to_bytes(2,'little')                                    # (2byte)o += (sampleRate).to_bytes(4,'little')                                      # (4byte)o += (sampleRate * num_channels * bitsPerSample // 8).to_bytes(4,'little')  # (4byte)o += (num_channels * bitsPerSample // 8).to_bytes(2,'little')               # (2byte)o += (bitsPerSample).to_bytes(2,'little')                                   # (2byte)o += bytes("data",'ascii')                                                  # (4byte) Data Chunk Markero += (datasize).to_bytes(4,'little')                                        # (4byte) Data size in bytesreturn odef start_in(sfile='s.wav', sampleRate=8000, bitsPerSample=16):bufSize=32768# 连接端口:3.3V SD->G21  WS->G22 SCK->G23  L/R-> 低电频#I2S所需管脚#数据时钟(INMP441模块SCK)sck_pin = Pin(23)#帧时钟(INMP441模块模块WS)ws_pin = Pin(22)#数据(INMP441模块模块SD)sd_pin = Pin(21)#创建用于音频录制的I2S对象audioInI2S = I2S(0,sck=sck_pin, ws=ws_pin, sd=sd_pin,mode=I2S.RX,bits=bitsPerSample,format=I2S.STEREO,rate=sampleRate,ibuf=bufSize)#音频数据读取缓冲readBuf = bytearray(bufSize)print("start ready.......")#休眠一点时间utime.sleep(2.0)# 检查文件是否存在if sfile in uos.listdir():# 删除文件print('del', sfile)uos.remove(sfile)utime.sleep(0.5)fin = open(sfile, 'wb')file_duration = 10 # 文件时长（秒）start_time = time.time()num_channels = 2f = Truehead = createWavHeader(sampleRate, bitsPerSample, num_channels, bufSize*file_duration)fin.write(head)print("in ready.......")while f:# 读取音频数据currByteCount = audioInI2S.readinto(readBuf)print('in ', len(readBuf))audio_data = bytearray()audio_data.extend(readBuf)fin.write(audio_data)# 检查是否到达文件时长if time.time() - start_time >= file_duration:f = Falsefin.close()print('in end')def start_out(sfile='s.wav', sampleRate=8000, bitsPerSample=16):if not sfile in uos.listdir():print('not found ', sfile)return# 初始化引脚定义"""GPIO13 -- DINGPIO12 --- BCLKGPIO14 -- LRCGND -- GND5V或3.3V -- VCC"""sck_pin = Pin(12) # 串行时钟输出ws_pin = Pin(14)  # 字时钟sd_pin = Pin(13)  # 串行数据输出# 初始化i2saudio_out = I2S(1, sck=sck_pin, ws=ws_pin, sd=sd_pin,mode=I2S.TX, bits=bitsPerSample, format=I2S.STEREO,rate=sampleRate, ibuf=20000)f = open(sfile,'rb')# 跳过文件的开头的44个字节，直到数据段的第1个字节pos = f.seek(44) wav_samples = bytearray(1024)wav_samples_mv = memoryview(wav_samples)print("start out ...")#并将其写入I2S DACwhile True:try:num_read = f.readinto(wav_samples_mv)# WAV文件结束if num_read == 0: break# 直到所有样本都写入I2S外围设备num_written = 0while num_written < num_read:num_written += audio_out.write(wav_samples_mv[num_written:num_read])except Exception as ret:print("产生异常...", ret)breakprint(' out end')print('start')
# 录音
start_in()
# 音频播放
start_out()
print('end')

运行日志

start
start ready.......
del s.wav
in ready.......
in  32768
in  32768
in  32768
in  32768
in  32768
in  32768
in  32768
in  32768
in end
start out ...out end
end

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