I2S INMP441 in MAX98357a out

[TecDroiD]

hi, I try to figure out how to work with i2s esp32 and so far I could write sound to MAX98..however..
Now I want to read from the MEMS and write it to the Speaker and get.. accoustical trash..

Any idea what I could currently do wrong? wrong Pins? wrong baudrate, buffersize, ... ?

here's my test code which reads 5 chunks of data from mic and writes them to speaker after

import os
import math
import struct
from machine import I2S
from machine import Pin

SAMPLERATE = 8000
BITS = 16
BUFSIZE = 8000


def create_input():
    sck_pin = Pin(12)   # Serial clock output
    ws_pin = Pin(14)    # Word clock output
    sd_pin = Pin(27)    # Serial data output

    return I2S(
            1,
            sck=sck_pin,
            ws=ws_pin,
            sd=sd_pin,
            format=I2S.STEREO,
            bits=BITS,
            rate=SAMPLERATE,
            ibuf=BUFSIZE,
            mode=I2S.RX,
            )



def create_output():
    sck_pin = Pin(25)   # Serial clock output
    ws_pin = Pin(32)    # Word clock output
    sd_pin = Pin(33)    # Serial data output

    return I2S(
            0, sck=sck_pin, ws=ws_pin, sd=sd_pin,
            mode=I2S.TX, bits=BITS, format=I2S.MONO,
            rate=SAMPLERATE, ibuf=BUFSIZE
            )

def record_and_replay():
    inpt = create_input()
    out = create_output()

    data = [bytearray(BUFSIZE)] * 5
    print("recording")
    for i in range(5):
        inpt.readinto(data[i])

    print("playing")
    for i in range(5):
        out.write(data[i])


    # cleanup
    out.deinit()
    inpt.deinit()

[miketeachman]

One thing to try: change the constructor to use format=I2S.MONO. This microphone has only one channel. You can find other I2S examples here: https://github.com/miketeachman/micropython-i2s-examples