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src/main.cpp

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+#include <Arduino.h>
+
+// Use two GPIOs with onboard-friendly defaults; adjust to match your dev kit.
+constexpr gpio_num_t LED1_PIN = GPIO_NUM_2;  // Often labeled "LED_BUILTIN".
+constexpr gpio_num_t LED2_PIN = GPIO_NUM_4;
+
+constexpr TickType_t LED1_DELAY = pdMS_TO_TICKS(250);  // 4 Hz blink.
+constexpr TickType_t LED2_DELAY = pdMS_TO_TICKS(700);  // ~1.4 Hz blink.
+
+// FreeRTOS tasks must have C linkage-compatible signatures.
+void ledTask(void *parameter) {
+  const gpio_num_t pin = static_cast<gpio_num_t>(reinterpret_cast<intptr_t>(parameter));
+  const TickType_t delay = (pin == LED1_PIN) ? LED1_DELAY : LED2_DELAY;
+
+  pinMode(pin, OUTPUT);
+
+  // Align the first toggle with system tick so the cadence stays consistent.
+  TickType_t nextWake = xTaskGetTickCount();
+
+  bool state = false;
+  while (true) {
+    digitalWrite(pin, state ? HIGH : LOW);
+    state = !state;
+
+    // vTaskDelayUntil keeps a steady period even if the loop body jitters.
+    vTaskDelayUntil(&nextWake, delay);
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial && millis() < 3000) {
+    // Give USB CDC boards a moment to enumerate; safe to ignore for pure UART boards.
+    delay(10);
+  }
+  Serial.println("FreeRTOS dual LED blink demo starting up...");
+
+  // The Arduino core already starts the scheduler after setup() returns.
+  xTaskCreate(
+      ledTask,        // Task function.
+      "LED1",         // Label (shows up in diagnostics).
+      2048,           // Stack size in words.
+      reinterpret_cast<void *>(static_cast<intptr_t>(LED1_PIN)),
+      1,              // Priority.
+      nullptr);
+
+  xTaskCreate(
+      ledTask,
+      "LED2",
+      2048,
+      reinterpret_cast<void *>(static_cast<intptr_t>(LED2_PIN)),
+      1,
+      nullptr);
+}
+
+void loop() {
+  // Leave loop() empty; the FreeRTOS tasks do the work.
+  vTaskDelay(pdMS_TO_TICKS(1000));
+}