rx_lora_oledV1.ino

// Feather9x_RX
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messaging client (receiver)
// with the RH_RF95 class. RH_RF95 class does not provide for addressing or
// reliability, so you should only use RH_RF95 if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example Feather9x_TX

#include <SPI.h>
#include <RH_RF95.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 32, &Wire);

/* for Feather32u4 RFM9x */
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 7


/* for feather m0 RFM9x
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 3
*/

/* for shield 
#define RFM95_CS 10
#define RFM95_RST 9
#define RFM95_INT 7
*/

/* Feather 32u4 w/wing
#define RFM95_RST     11   // "A"
#define RFM95_CS      10   // "B"
#define RFM95_INT     2    // "SDA" (only SDA/SCL/RX/TX have IRQ!)
*/

/* Feather m0 w/wing 
#define RFM95_RST     11   // "A"
#define RFM95_CS      10   // "B"
#define RFM95_INT     6    // "D"
*/

#if defined(ESP8266)
  /* for ESP w/featherwing */ 
  #define RFM95_CS  2    // "E"
  #define RFM95_RST 16   // "D"
  #define RFM95_INT 15   // "B"

#elif defined(ESP32)  
  /* ESP32 feather w/wing */
  #define RFM95_RST     27   // "A"
  #define RFM95_CS      33   // "B"
  #define RFM95_INT     12   //  next to A

#elif defined(NRF52)  
  /* nRF52832 feather w/wing */
  #define RFM95_RST     7   // "A"
  #define RFM95_CS      11   // "B"
  #define RFM95_INT     31   // "C"
  
#elif defined(TEENSYDUINO)
  /* Teensy 3.x w/wing */
  #define RFM95_RST     9   // "A"
  #define RFM95_CS      10   // "B"
  #define RFM95_INT     4    // "C"
#endif


// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 915.0

// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);

// Blinky on receipt
#define LED 13

void setup()
{
  pinMode(LED, OUTPUT);
  pinMode(RFM95_RST, OUTPUT);
  digitalWrite(RFM95_RST, HIGH);

  Serial.begin(115200);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Address 0x3C for 128x32
  display.display();
  delay(1000);

  // Clear the buffer.
  display.clearDisplay();
  display.display();

   // text display tests
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);

  
  

  Serial.println("Feather LoRa RX Test!");

  // manual reset
  digitalWrite(RFM95_RST, LOW);
  delay(10);
  digitalWrite(RFM95_RST, HIGH);
  delay(10);

  while (!rf95.init()) {
    Serial.println("LoRa radio init failed");
    while (1);
  }
  Serial.println("LoRa radio init OK!");

  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
  if (!rf95.setFrequency(RF95_FREQ)) {
    Serial.println("setFrequency failed");
    while (1);
  }
  Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);

  // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on

  // The default transmitter power is 13dBm, using PA_BOOST.
  // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
  // you can set transmitter powers from 5 to 23 dBm:
  rf95.setTxPower(23, false);
}

void loop()
{
  
  display.setCursor(0,0);
  display.clearDisplay();
  display.display();
  if (rf95.available())
  {
    // Should be a message for us now
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);

    if (rf95.recv(buf, &len))
    {
      digitalWrite(LED, HIGH);
      RH_RF95::printBuffer("Received: ", buf, len);
      Serial.print("Got: ");
      Serial.println((char*)buf);
      Serial.print("RSSI:");
      Serial.println(rf95.lastRssi(), DEC);

      //Display in OLED
      display.clearDisplay();
      display.println("RSSI");
      display.println(rf95.lastRssi());
      //display.println(rf95.lastSNR());
      display.display(); // actually display all of the above
      delay(1000);

      display.clearDisplay();
      display.println("SNR");
      display.println(rf95.lastSNR());
      display.display(); // actually display all of the above
      delay(1000);

      // Send a reply
      uint8_t data[] = "And hello back to you";
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent a reply");
      digitalWrite(LED, LOW);
    }
  }
  
  
}