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功能：
- wav音频文件本地录音，并播放
- 录音模块：INMP441
- 音频模块：MAX98357
- 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
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