/*
  RadioLib STM32WLx Blocking Transmit Example

  This example transmits packets using STM32WL MCU with integrated
  (SX126x) LoRa radio.

  Each packet contains up to 256 bytes of data, in the form of:
  - Arduino String
  - null-terminated char array (C-string)
  - arbitrary binary data (byte array)
  
  This example assumes Nucleo WL55JC1 is used. For other Nucleo boards
  or standalone STM32WL, some configuration such as TCXO voltage and
  RF switch control may have to be adjusted.

  Using blocking transmit is not recommended, as it will lead
  to inefficient use of processor time!
  Instead, interrupt transmit is recommended.

  For default module settings, see the wiki page
  https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx126x---lora-modem

  For full API reference, see the GitHub Pages
  https://jgromes.github.io/RadioLib/
*/

// include the library
#include <RadioLib.h>

// no need to configure pins, signals are routed to the radio internally
STM32WLx radio = new STM32WLx_Module();

// set RF switch configuration for Nucleo WL55JC1
// NOTE: other boards may be different!
//       Some boards may not have either LP or HP.
//       For those, do not set the LP/HP entry in the table.
static const uint32_t rfswitch_pins[] =
                         {PC3,  PC4,  PC5, RADIOLIB_NC, RADIOLIB_NC};
static const Module::RfSwitchMode_t rfswitch_table[] = {
  {STM32WLx::MODE_IDLE,  {LOW,  LOW,  LOW}},
  {STM32WLx::MODE_RX,    {HIGH, HIGH, LOW}},
  {STM32WLx::MODE_TX_LP, {HIGH, HIGH, HIGH}},
  {STM32WLx::MODE_TX_HP, {HIGH, LOW,  HIGH}},
  END_OF_MODE_TABLE,
};

void setup() {
  Serial.begin(9600);

  // set RF switch control configuration
  // this has to be done prior to calling begin()
  radio.setRfSwitchTable(rfswitch_pins, rfswitch_table);

  // initialize STM32WL with default settings, except frequency
  Serial.print(F("[STM32WL] Initializing ... "));
  int state = radio.begin(868.0);
  if (state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while (true) { delay(10); }
  }

  // set appropriate TCXO voltage for Nucleo WL55JC1
  state = radio.setTCXO(1.7);
  if (state == RADIOLIB_ERR_NONE) {
    Serial.println(F("success!"));
  } else {
    Serial.print(F("failed, code "));
    Serial.println(state);
    while (true) { delay(10); }
  }
}

// counter to keep track of transmitted packets
int count = 0;

void loop() {
  Serial.print(F("[STM32WL] Transmitting packet ... "));

  // you can transmit C-string or Arduino string up to
  // 256 characters long
  String str = "Hello World! #" + String(count++);
  int state = radio.transmit(str);

  // you can also transmit byte array up to 256 bytes long
  /*
    byte byteArr[] = {0x01, 0x23, 0x45, 0x56, 0x78, 0xAB, 0xCD, 0xEF};
    int state = radio.transmit(byteArr, 8);
  */

  if (state == RADIOLIB_ERR_NONE) {
    // the packet was successfully transmitted
    Serial.println(F("success!"));

  } else if (state == RADIOLIB_ERR_PACKET_TOO_LONG) {
    // the supplied packet was longer than 256 bytes
    Serial.println(F("too long!"));

  } else if (state == RADIOLIB_ERR_TX_TIMEOUT) {
    // timeout occured while transmitting packet
    Serial.println(F("timeout!"));

  } else {
    // some other error occurred
    Serial.print(F("failed, code "));
    Serial.println(state);

  }

  // wait for a second before transmitting again
  delay(1000);
}
