LLCC68: add PREAMBLE_DETECTED to reported irq flags

src/helpers/radiolib/CustomLLCC68.h

@@ -2,9 +2,6 @@
 
 #include <RadioLib.h>
 
-#define SX126X_IRQ_HEADER_VALID                     0b0000010000  //  4     4     valid LoRa header received
-#define SX126X_IRQ_PREAMBLE_DETECTED           0x04
-
 class CustomLLCC68 : public LLCC68 {
   public:
     CustomLLCC68(Module *mod) : LLCC68(mod) { }
@@ -78,9 +75,14 @@ class CustomLLCC68 : public LLCC68 {
     return true;  // success
   }
 
+    int16_t startReceive() override {
+      // include the PREAMBLE_DETECTED irq bit in reported flags
+      return LLCC68::startReceive(RADIOLIB_SX126X_RX_TIMEOUT_INF, RADIOLIB_IRQ_RX_DEFAULT_FLAGS | (1UL << RADIOLIB_IRQ_PREAMBLE_DETECTED), RADIOLIB_IRQ_RX_DEFAULT_MASK, 0);
+    }
+
     bool isReceiving() {
       uint16_t irq = getIrqFlags();
-      bool detected = (irq & SX126X_IRQ_HEADER_VALID) || (irq & SX126X_IRQ_PREAMBLE_DETECTED);
+      bool detected = (irq & RADIOLIB_SX126X_IRQ_HEADER_VALID) || (irq & RADIOLIB_SX126X_IRQ_PREAMBLE_DETECTED);
       return detected;
     }