// SX1262: CS, IRQ, NRST, BUSY
SX1262 radio = new Module(23, 7, RADIOLIB_NC, 19);

bool receiveFlag = false; // flag to indicate that a packet was received

// function to be called when a complete packet is received
void setFlag(void) {
receiveFlag = true;
}

#define LORA_MISO 22 //38 //19
#define LORA_MOSI 21 //23
#define LORA_SCLK 20 //18

void setup() {

// auto cfg = M5.config();
// M5.begin(cfg);

Serial.begin(115200);
M5.begin();
delay(1000);

Serial.println("And we have started");

if (SPI.begin(LORA_SCLK, LORA_MISO, LORA_MOSI,-1))  // SCK, MISO, MOSI, SS
  {
    Serial.println("Fine");
    M5.Display.print("SPI is fine");
  }
else 
  {
     Serial.println("Not fine");
     M5.Display.print("SPI ERROR");
   }

auto& ioe = M5.getIOExpander(0);
ioe.digitalWrite(7, false);
delay(100);
ioe.digitalWrite(7, true); // re-enable SX_NRST
ioe.digitalWrite(6, true); // enable SX_ANT_SW
ioe.digitalWrite(5, true); // enable SX_LNA_EN

// initialize SX1262
Serial.print("\n[SX1262] Initializing... ");
// frequency MHz, bandwidth kHz, spreading factor, coding rate denominator, sync word,
// output power dBm, preamble length, TCXO reference voltage, useRegulatorLDO
int beginState = radio.begin(868.0, 125.0, 12, 5, 0x34, 22, 20, 3.0, true);
if (beginState == RADIOLIB_ERR_NONE) {
Serial.println("Succeeded!");
} else {
Serial.print("Failed, code: ");
Serial.println(beginState);
while (true) { delay(100); }
}

// set the function to be called when a new packet is received
radio.setPacketReceivedAction(setFlag);

// start listening for LoRa packets
Serial.print("[SX1262] Starting to listen... ");
int receiveState = radio.startReceive();
if (receiveState == RADIOLIB_ERR_NONE) {
Serial.println("Succeeded!");
} else {
Serial.print("Failed, code: ");
Serial.println(receiveState);
while (true) { delay(100); }
}
}

void loop() {
if (receiveFlag) { // check if a new packet is received
receiveFlag = false; // reset the flag

String str;  // read the received data as an Arduino String
int readState = radio.readData(str);

if (readState == RADIOLIB_ERR_NONE) {  // packet was received successfully
  Serial.println("\n[SX1262] Received packet!");
  Serial.print("[SX1262] Data: ");
  Serial.println(str);

  Serial.print("[SX1262] RSSI: ");
  Serial.print(radio.getRSSI());  // Received Signal Strength Indicator
  Serial.println(" dBm");

  Serial.print("[SX1262]  SNR: ");
  Serial.print(radio.getSNR());  // Signal-to-Noise Ratio
  Serial.println(" dB");

  Serial.print("[SX1262] Frequency error: ");
  Serial.print(radio.getFrequencyError());
  Serial.println(" Hz");

} else if (readState == RADIOLIB_ERR_CRC_MISMATCH) {  // packet was received but malformed
  Serial.println("CRC error!");

} else {  // some other error occurred
  Serial.print("Failed, code: ");
  Serial.println(readState);
}

}
}