Adafruit CircuitPython 9.2.7 on 2025-04-01; S2Mini with ESP32S2-S2FN4R2

import supervisor
import time
import board
import audiomp3
import audiobusio
import busio

import sdcardio
import storage
import os

# --- configuration   ---

# SD-card (SPI)
PIN_MISO = board.IO10
PIN_MOSI = board.IO6
PIN_CLK  = board.IO8
PIN_CS   = board.IO4
PINS_I2S = [board.IO11,board.IO12,board.IO9] # BLCK, WSEL, DATA

# --- mount SD-card   ---

def mount_sd():
  """ mount SD-card """

  spi = None
  try:
    spi    = busio.SPI(PIN_CLK,PIN_MOSI,PIN_MISO)
    sdcard = sdcardio.SDCard(spi,PIN_CS,1_000_000)
    vfs    = storage.VfsFat(sdcard)
    storage.mount(vfs, "/mnt")
  except Exception as ex:
    if spi:
      spi.deinit()
    raise
  return spi

# --- play music   ------

def play_music(files):
  """ create music task """
  audio = audiobusio.I2SOut(*PINS_I2S)

  print("start playing music")
  for f in files:
    try:
      fs = open(f,"rb")
      mp3 = audiomp3.MP3Decoder(fs)
      print(f"starting {f}")
      audio.play(mp3)
      while audio.playing:
        time.sleep(0.5)
      print(f"finished {f}")
    except Exception as ex:
      print(f"could not play {f}: {ex}")
    fs.close()
    mp3.deinit()
    time.sleep(0.5)
  print("done playing")
  
# --- main program   ----

while not supervisor.runtime.serial_connected:
  time.sleep(1)

spi = mount_sd()
files = os.listdir("/mnt")
print(f"os.listdir('/mnt'): {files=}")
files = ["/mnt/"+f for f in files if f[-3:] == "mp3"]
files.sort()
print(f"sorted: {files=}")

play_music(files)