/*
    RadioLib SX127x Settings Example
 
    This example shows how to change all the properties of LoRa transmission.
    RadioLib currently supports the following settings:
     - pins (SPI slave select, digital IO 0, digital IO 1)
     - carrier frequency
     - bandwidth
     - spreading factor
     - coding rate
     - sync word
     - output power during transmission
 
     Other modules from SX127x/RFM9x family can also be used.
 
     For default module settings, see the wiki page
     https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx127xrfm9x---lora-modem
 
     For full API reference, see the GitHub Pages
     https://jgromes.github.io/RadioLib/
 */
 
 // include the library
 #include <RadioLib.h>
 
 // SX1278 has the following connections:
 // NSS pin:   10
 // DIO0 pin:  2
 // RESET pin: 9
 // DIO1 pin:  3
 SX1278 radio1 = new Module(10, 2, 9, 3);
 
 // SX1272 has different connections:
 // NSS pin:   9
 // DIO0 pin:  4
 // RESET pin: 5
 // DIO1 pin:  6
 SX1272 radio2 = new Module(9, 4, 5, 6);
 
 // or using RadioShield
 // https://github.com/jgromes/RadioShield
 //SX1276 radio3 = RadioShield.ModuleB;
 
 void setup() {
   Serial.begin(9600);
 
   // initialize SX1278 with default settings
   Serial.print(F("[SX1278] Initializing ... "));
   int state = radio1.begin();
   if (state == RADIOLIB_ERR_NONE) {
     Serial.println(F("success!"));
   } else {
     Serial.print(F("failed, code "));
     Serial.println(state);
     while (true);
   }
 
   // initialize the second LoRa instance with
   // non-default settings
   // this LoRa link will have high data rate,
   // but lower range
   // NOTE: when using spreading factor 6, the total packet
   //       length has to be known in advance!
   //       you have to pass the number of expected bytes
   //       to the receive() method
   Serial.print(F("[SX1272] Initializing ... "));
   // carrier frequency:           915.0 MHz
   // bandwidth:                   500.0 kHz
   // spreading factor:            6
   // coding rate:                 5
   // sync word:                   0x14
   // output power:                2 dBm
   // preamble length:             20 symbols
   // amplifier gain:              1 (maximum gain)
   state = radio2.begin(915.0, 500.0, 6, 5, 0x14, 2, 20, 1);
   if (state == RADIOLIB_ERR_NONE) {
     Serial.println(F("success!"));
   } else {
     Serial.print(F("failed, code "));
     Serial.println(state);
     while (true);
   }
 
   // you can also change the settings at runtime
   // and check if the configuration was changed successfully
 
   // set carrier frequency to 433.5 MHz
   if (radio1.setFrequency(433.5) == RADIOLIB_ERR_INVALID_FREQUENCY) {
     Serial.println(F("Selected frequency is invalid for this module!"));
     while (true);
   }
 
   // set bandwidth to 250 kHz
   if (radio1.setBandwidth(250.0) == RADIOLIB_ERR_INVALID_BANDWIDTH) {
     Serial.println(F("Selected bandwidth is invalid for this module!"));
     while (true);
   }
 
   // set spreading factor to 10
   if (radio1.setSpreadingFactor(10) == RADIOLIB_ERR_INVALID_SPREADING_FACTOR) {
     Serial.println(F("Selected spreading factor is invalid for this module!"));
     while (true);
   }
 
   // set coding rate to 6
   if (radio1.setCodingRate(6) == RADIOLIB_ERR_INVALID_CODING_RATE) {
     Serial.println(F("Selected coding rate is invalid for this module!"));
     while (true);
   }
 
   // set LoRa sync word to 0x14
   // NOTE: value 0x34 is reserved for LoRaWAN networks and should not be used
   if (radio1.setSyncWord(0x14) != RADIOLIB_ERR_NONE) {
     Serial.println(F("Unable to set sync word!"));
     while (true);
   }
 
   // set output power to 10 dBm (accepted range is -3 - 17 dBm)
   // NOTE: 20 dBm value allows high power operation, but transmission
   //       duty cycle MUST NOT exceed 1%
   if (radio1.setOutputPower(10) == RADIOLIB_ERR_INVALID_OUTPUT_POWER) {
     Serial.println(F("Selected output power is invalid for this module!"));
     while (true);
   }
 
   // set over current protection limit to 80 mA (accepted range is 45 - 240 mA)
   // NOTE: set value to 0 to disable overcurrent protection
   if (radio1.setCurrentLimit(80) == RADIOLIB_ERR_INVALID_CURRENT_LIMIT) {
     Serial.println(F("Selected current limit is invalid for this module!"));
     while (true);
   }
 
   // set LoRa preamble length to 15 symbols (accepted range is 6 - 65535)
   if (radio1.setPreambleLength(15) == RADIOLIB_ERR_INVALID_PREAMBLE_LENGTH) {
     Serial.println(F("Selected preamble length is invalid for this module!"));
     while (true);
   }
 
   // set amplifier gain to 1 (accepted range is 1 - 6, where 1 is maximum gain)
   // NOTE: set value to 0 to enable automatic gain control
   //       leave at 0 unless you know what you're doing
   if (radio1.setGain(1) == RADIOLIB_ERR_INVALID_GAIN) {
     Serial.println(F("Selected gain is invalid for this module!"));
     while (true);
   }
 
   Serial.println(F("All settings successfully changed!"));
 }
 
 void loop() {
   // nothing here
 }

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