//modified lora library by Sandeep Mistry for TTGO ESP32 Lora
// lora Sender
#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>  // Only needed for Arduino 1.6.5 and earlier
#include "SSD1306Wire.h" // legacy include: `#include "SSD1306.h"`

// GPIO5  -- SX1278's SCK
// GPIO19 -- SX1278's MISO
// GPIO27 -- SX1278's MOSI
// GPIO18 -- SX1278's CS
// GPIO14 -- SX1278's RESET
// GPIO26 -- SX1278's IRQ(Interrupt Request)

#define SS      18
#define RST     14
#define DI0     26
#define BAND    433E6
int counter = 0;
int state = 0;

// Initialize the OLED display using Wire library
SSD1306Wire  display(0x3c, OLED_SDA, OLED_SCL); // OLED_SDA=4, OLED_SCL=15

void setup() {
  // START aktivas Oled
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(16, OUTPUT);
  digitalWrite(16, LOW);    // set GPIO16 low to reset OLED
  delay(50);
  digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 in high、

  // Initialising the UI will init the display too.
  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  // clear the display
  display.clear();
  // aktivasi Oled END

  pinMode(25, OUTPUT); //Send success, LED will bright 1 second

  Serial.begin(115200);
  while (!Serial); //If just the the basic function, must connect to a computer

  SPI.begin(5, 19, 27, 18);
  LoRa.setPins(SS, RST, DI0);
  //  Serial.println("LoRa Sender");

  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  Serial.println("LoRa Initial OK!");
}

void loop() {
  display.setFont(ArialMT_Plain_24);
  display.drawString(0, 0, "HwThinker");
  display.display();

  display.setFont(ArialMT_Plain_16);
  display.drawString(0, 24, "Lora Sender");
  display.display();

  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.setFont(ArialMT_Plain_10);
  display.drawString(0, 45, "Sending packet : " + String(counter));
  display.display();

  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;
  digitalWrite(25, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(25, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second

  delay(3000);
  digitalWrite(LED_BUILTIN, (state) ? HIGH : LOW);
  state = !state;
  //or   digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
  display.clear();
}