Initial Code

src/main.cpp

@@ -0,0 +1,235 @@
+#include <Arduino.h>
+#include <SPI.h>
+#include <Wire.h>
+#include <RadioLib.h>
+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+
+// =========================
+// LoRa pins - LilyGO T3S3 SX1262
+// =========================
+static const int PIN_LORA_SCK  = 5;
+static const int PIN_LORA_MISO = 3;
+static const int PIN_LORA_MOSI = 6;
+static const int PIN_LORA_CS   = 7;
+static const int PIN_LORA_RST  = 8;
+static const int PIN_LORA_DIO1 = 33;
+static const int PIN_LORA_BUSY = 34;
+
+// =========================
+// Button - LilyGO T3S3
+// BOOT button usually GPIO0, active low
+// =========================
+static const int PIN_BUTTON = 0;
+
+// =========================
+// OLED pins - LilyGO T3S3 OLED
+// =========================
+static const int OLED_SDA = 18;
+static const int OLED_SCL = 17;
+static const int OLED_ADDR = 0x3C;
+static const int SCREEN_WIDTH = 128;
+static const int SCREEN_HEIGHT = 64;
+
+// =========================
+// ACTIVE PROFILE - Shelly / custom LoRa
+// =========================
+static const float LORA_FREQ_MHZ      = 865.000;
+static const float LORA_BW_KHZ        = 125.0;
+static const uint8_t LORA_SF          = 12;
+static const uint8_t LORA_CR          = 5;
+static const uint8_t LORA_SYNC_WORD   = 0x12;
+static const int8_t  LORA_TX_POWER    = 10;
+static const uint16_t LORA_PREAMBLE   = 10;
+static const float LORA_TCXO_VOLTAGE  = 1.6;
+static const bool LORA_USE_LDO        = false;
+static const bool LORA_USE_CRC        = false;
+static const bool LORA_EXPLICIT_HDR   = true;
+
+// =========================
+// Protocol
+// =========================
+static const String DEVICE_ID = "MG64738";
+static const String CMD_ON    = "ON";
+static const String CMD_OFF   = "OF";
+
+// =========================
+// Objects
+// =========================
+Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
+SX1262 radio = new Module(PIN_LORA_CS, PIN_LORA_DIO1, PIN_LORA_RST, PIN_LORA_BUSY);
+
+// =========================
+// Runtime state
+// =========================
+bool outputState = true;       // start with ON
+bool lastButtonState = HIGH;
+unsigned long lastDebounceMs = 0;
+unsigned long txCount = 0;
+int lastTxState = 0;
+
+static const unsigned long DEBOUNCE_MS = 60;
+
+// =========================
+// Helpers
+// =========================
+String formatCR(uint8_t cr) {
+  return "4/" + String(cr);
+}
+
+String formatHexByte(uint8_t value) {
+  char buf[5];
+  snprintf(buf, sizeof(buf), "%02X", value);
+  return String(buf);
+}
+
+String currentPayload() {
+  return DEVICE_ID + "|" + (outputState ? CMD_ON : CMD_OFF);
+}
+
+void drawLine(int x, int y, const String& text) {
+  display.setCursor(x, y);
+  display.print(text);
+}
+
+void drawStatusScreen(const String& status) {
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(SSD1306_WHITE);
+
+  drawLine(0, 0, "LoRa Button TX");
+  drawLine(88, 0, String(txCount) + " tx");
+
+  drawLine(0, 10, "F:" + String(LORA_FREQ_MHZ, 3));
+  drawLine(0, 20, "BW:" + String(LORA_BW_KHZ, 1) + " SF:" + String(LORA_SF));
+  drawLine(0, 30, "CR:" + formatCR(LORA_CR) + " SW:0x" + formatHexByte(LORA_SYNC_WORD));
+
+  drawLine(0, 42, status);
+  drawLine(0, 54, currentPayload());
+
+  display.display();
+}
+
+void drawErrorScreen(const String& title, int code) {
+  display.clearDisplay();
+  display.setTextSize(1);
+  display.setTextColor(SSD1306_WHITE);
+
+  drawLine(0, 0, title);
+  drawLine(0, 12, "code: " + String(code));
+
+  display.display();
+}
+
+void sendCurrentState() {
+  String payload = currentPayload();
+
+  drawStatusScreen("Sending...");
+
+  Serial.print("TX: ");
+  Serial.println(payload);
+
+  int state = radio.transmit(payload);
+  lastTxState = state;
+
+  if (state == RADIOLIB_ERR_NONE) {
+    txCount++;
+
+    Serial.println("TX OK");
+    drawStatusScreen(outputState ? "Sent ON" : "Sent OF");
+  } else {
+    Serial.print("TX failed, code ");
+    Serial.println(state);
+    drawStatusScreen("TX failed: " + String(state));
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(1500);
+
+  pinMode(PIN_BUTTON, INPUT_PULLUP);
+
+  Wire.begin(OLED_SDA, OLED_SCL);
+
+  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
+    Serial.println("OLED init failed");
+    while (true) delay(1000);
+  }
+
+  drawStatusScreen("Booting...");
+
+  SPI.begin(PIN_LORA_SCK, PIN_LORA_MISO, PIN_LORA_MOSI, PIN_LORA_CS);
+
+  Serial.println();
+  Serial.println("Starting LoRa button sender...");
+
+  int state = radio.begin(
+    LORA_FREQ_MHZ,
+    LORA_BW_KHZ,
+    LORA_SF,
+    LORA_CR,
+    LORA_SYNC_WORD,
+    LORA_TX_POWER,
+    LORA_PREAMBLE,
+    LORA_TCXO_VOLTAGE,
+    LORA_USE_LDO
+  );
+
+  if (state != RADIOLIB_ERR_NONE) {
+    Serial.print("radio.begin failed, code ");
+    Serial.println(state);
+    drawErrorScreen("LoRa init failed", state);
+    while (true) delay(1000);
+  }
+
+  if (LORA_EXPLICIT_HDR) {
+    state = radio.explicitHeader();
+  } else {
+    state = radio.implicitHeader(LORA_PREAMBLE);
+  }
+
+  if (state != RADIOLIB_ERR_NONE) {
+    Serial.print("header mode failed, code ");
+    Serial.println(state);
+    drawErrorScreen("Header config failed", state);
+    while (true) delay(1000);
+  }
+
+  state = radio.setCRC(LORA_USE_CRC);
+
+  if (state != RADIOLIB_ERR_NONE) {
+    Serial.print("CRC config failed, code ");
+    Serial.println(state);
+    drawErrorScreen("CRC config failed", state);
+    while (true) delay(1000);
+  }
+
+  drawStatusScreen("Ready");
+
+  sendCurrentState();   // first send = MG64738|ON
+}
+
+void loop() {
+  bool buttonState = digitalRead(PIN_BUTTON);
+
+  if (buttonState != lastButtonState) {
+    lastDebounceMs = millis();
+    lastButtonState = buttonState;
+  }
+
+  if ((millis() - lastDebounceMs) > DEBOUNCE_MS) {
+    static bool pressHandled = false;
+
+    if (buttonState == LOW && !pressHandled) {
+      pressHandled = true;
+
+      outputState = !outputState;
+      sendCurrentState();
+    }
+
+    if (buttonState == HIGH) {
+      pressHandled = false;
+    }
+  }
+}