/***
 * We use the RP2040 SPISlave to implement the SPI slave
 * which receives the data
 *
 * Untested DRAFT implementation!
 */
#include <SPISlave.h>

AudioInfo info(44100, 2, 16);  //
I2SStream out;                 // or replace with another output

// Wiring:
// Master RX  GP0 <-> GP11  Slave TX
// Master CS  GP1 <-> GP9   Slave CS
// Master CK  GP2 <-> GP10  Slave CK
// Master TX  GP3 <-> GP8   Slave RX

SPISettings spisettings(2000000, MSBFIRST, SPI_MODE0);

// Core 1 will be SPI slave
void recvCallback(uint8_t *data, size_t len) { out.write(data, len); }

void setup() {
  Serial.begin(115200);

  // setup I2S
  auto cfg = out.defaultConfig(TX_MODE);
  cfg.copyFrom(info);
  // cfg.pin_bck = 14;
  // cfg.pin_ws = 15;
  // cfg.pin_data = 22;
  out.begin(cfg);

  // setup SPI
  SPISlave.setRX(8);
  SPISlave.setCS(9);
  SPISlave.setSCK(10);
  SPISlave.setTX(11);
  // Hook our callbacks into the slave
  SPISlave.onDataRecv(recvCallback);
  SPISlave.begin(spisettings);

  delay(1000);
  Serial.println("SPISlave started");
}

void loop() {}