Give ThinkNode-m4 a heartbeat

src/modules/StatusLEDModule.cpp

@@ -111,6 +111,19 @@ int32_t StatusLEDModule::runOnce()
 #endif
     }
 
+// If we want a LED to be dedicated to the simple hearbeat, we can use that instead of the charge LED
+#if defined(LED_HEARTBEAT)
+    if (!config.device.led_heartbeat_disabled) {
+        if (HEARTBEAT_LED_state == LED_STATE_ON) {
+            HEARTBEAT_LED_state = LED_STATE_OFF;
+            my_interval = 999;
+        } else {
+            HEARTBEAT_LED_state = LED_STATE_ON;
+            my_interval = 1;
+        }
+        digitalWrite(LED_HEARTBEAT, HEARTBEAT_LED_state);
+    }
+#endif
     if (!config.bluetooth.enabled || PAIRING_LED_starttime + 30 * 1000 < millis() || doing_fast_blink) {
         PAIRING_LED_state = LED_STATE_OFF;
     } else if (ble_state == unpaired) {

src/modules/StatusLEDModule.h

@@ -34,6 +34,9 @@ class StatusLEDModule : private concurrency::OSThread
   private:
     bool CHARGE_LED_state = LED_STATE_OFF;
     bool PAIRING_LED_state = LED_STATE_OFF;
+#if defined(LED_HEARTBEAT)
+    bool HEARTBEAT_LED_state = LED_STATE_OFF;
+#endif
 
     uint32_t PAIRING_LED_starttime = 0;
     uint32_t lastUserbuttonTime = 0;

variants/nrf52840/ELECROW-ThinkNode-M4/variant.h

@@ -43,6 +43,7 @@ extern "C" {
 #define LED_BUILTIN -1
 #define LED_BLUE -1
 #define PIN_LED2 (32 + 9)
+#define LED_HEARTBEAT PIN_LED2
 #define LED_PAIRING (13)
 
 #define Battery_LED_1 (15)