Any valid example for M5Stack Core to play wav on Speaker

[ExtremeGTX]

Describe the bug

I tried to use the following code to play some wavfiles but unfortunatly it didn't work.

The MicroPython runtime keep complaining about I2S.MODE_MASTER | I2S.MODE_TX | I2S.MODE_DAC_BUILT_IN that neither of them is part of I2S module. could you please point me to an example which works on m5stack Core basic (The EOL version).

from machine import I2S, SDCard, Pin
from m5stack import *
import os, uos
from wav import wave

#mount the sd card
sd = SDCard(slot = 2, sck = Pin(23), miso = Pin(33), mosi = Pin(19), freq = 10000000)

#initialize the I2S device
i2s = I2S(  mode = I2S.MODE_MASTER | I2S.MODE_TX | I2S.MODE_DAC_BUILT_IN,
            rate = 16000,
            bits = 16,
            channel_format = I2S.CHANNEL_ONLY_LEFT,
            data_format = I2S.FORMAT_I2S_MSB)

#create a function to play the wav
def wav_player(fname):
    wav = wave.open(fname)
    i2s.set_dac_mode(I2S.DAC_RIGHT_EN)
    i2s.sample_rate(wav.getframerate())
    i2s.bits(wav.getsampwidth() * 8)
    i2s.nchannels(wav.getnchannels())
    i2s.volume(20)

    while True:
        data = wav.readframes(1024)
        if len(data) > 0:
            i2s.write(data)
        else:
            wav.close()
            break

# Playing WAV audio file
lcd.clear()
lcd.print('working',0,0,0xffffff)

try:
    uos.mountsd(sd, '/sd')
except:
    #os.mountsd()
    pass

speaker.setVolume(2)
#kill the weird start noise glitch
i2s.stop()

#point the directory to the files you have on your sd card - works best with short low file size wavs
while True:
    if btnA.wasPressed():
        wav_player('/flash/res/yourfile.wav')
        i2s.stop()
    if btnB.wasPressed():
        wav_player('/sd/yourOtherFile.wav')
        i2s.stop()
    if btnC.wasPressed():
        wav_player('/sd/anotherfile.wav')
        i2s.stop()

To reproduce

1. Use M5Burner-v3-beta-win-x64 to flash UiFlow v1.10.7.1 to the m5stack core basic
2. Go to https://flow.m5stack.com/
3. switch to python mode
4. Copy the code above
5. Click Run
6. Check the device screen for the related python error

Expected behavior

The code should run without displaying python errors.

Screenshots

No response

Environment

• OS: Windows 10
• IDE &IDE Version: UiFlow v1.10.7
• Repository Version:

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• My report contains all necessary details

[Tinyu-Zhao]

@imliubo Please help check this.

[chipguyhere]

I don't think Core has any I2S hardware in the first place. I think it plays analog audio directly from ESP32 pin 25, which supports direct digital-to-analog output. There's a Speaker class in the library that looks like it can play wave audio just by loosely banging it out to the pin.