Playing Audio from the M5Stack RCA Module 13.2

m5stack-rca-module.ino

// M5Stack Core Basic + RCA Module 13.2 (PCM5102)
// based on https://github.com/m5stack/M5Stack/blob/b3e801f/examples/Unit/RCA/RCA.ino

#include <M5Unified.h>

void setup() {
  auto cfg = M5.config();
  cfg.external_spk = true;
  cfg.internal_spk = false;

  M5.begin();

  auto spk_cfg = M5.Speaker.config();
  spk_cfg.i2s_port = I2S_NUM_1;
  spk_cfg.sample_rate = 96000;

  // via schematic at https://docs.m5stack.com/en/module/RCA%20Module%2013.2
  // LRCK      23  (G0/IIS_MK)
  // DIN       24  (G15/IIS_OUT)
  // BCK       21  (G13/IIS_WS)
  spk_cfg.pin_data_out = 15;
  spk_cfg.pin_bck = 13;
  spk_cfg.pin_ws = 0;  // LRCK

  spk_cfg.stereo = true;
  spk_cfg.buzzer = false;
  spk_cfg.use_dac = false;
  spk_cfg.magnification = 16;
  M5.Speaker.config(spk_cfg);

  M5.Speaker.begin();
  M5.Speaker.tone(661, 1000);  //Set the speaker to tone at 661Hz for 1000ms
}

void loop() {
  M5.update();
  delay(100);
}