Initial commit of Arduino libraries

RadioLib/examples/SX127x/SX127x_Channel_Activity_Detection_Blocking/SX127x_Channel_Activity_Detection_Blocking.ino

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+/*
+  RadioLib SX127x Blocking Channel Activity Detection Example
+
+  This example scans the current LoRa channel and detects
+  valid LoRa preambles. Preamble is the first part of
+  LoRa transmission, so this can be used to check
+  if the LoRa channel is free, or if you should start
+  receiving a message.
+
+  Other modules from SX127x/RFM9x family can also be used.
+
+  Using blocking CAD is not recommended, as it will lead
+  to significant amount of timeouts, inefficient use of processor
+  time and can some miss packets!
+  Instead, interrupt CAD is recommended.
+
+  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 radio = new Module(10, 2, 9, 3);
+
+// or detect the pinout automatically using RadioBoards
+// https://github.com/radiolib-org/RadioBoards
+/*
+#define RADIO_BOARD_AUTO
+#include <RadioBoards.h>
+Radio radio = new RadioModule();
+*/
+
+void setup() {
+  Serial.begin(9600);
+
+  // initialize SX1278 with default settings
+  Serial.print(F("[SX1278] Initializing ... "));
+  int state = radio.begin();
+  if (state == RADIOLIB_ERR_NONE) {
+    Serial.println(F("success!"));
+  } else {
+    Serial.print(F("failed, code "));
+    Serial.println(state);
+    while (true) { delay(10); }
+  }
+}
+
+void loop() {
+  Serial.print(F("[SX1278] Scanning channel for LoRa preamble ... "));
+
+  // start scanning current channel
+  int state = radio.scanChannel();
+
+  if (state == RADIOLIB_PREAMBLE_DETECTED) {
+    // LoRa preamble was detected
+    Serial.println(F("detected preamble!"));
+
+  } else if (state == RADIOLIB_CHANNEL_FREE) {
+    // no preamble was detected, channel is free
+    Serial.println(F("channel is free!"));
+
+  }
+
+  // wait 100 ms before new scan
+  delay(100);
+}