[SX128x] Implement generalized IRQ checks

src/modules/SX128x/SX128x.cpp

@@ -638,6 +638,37 @@ int16_t SX128x::readData(uint8_t* data, size_t len) {
   return(state);
 }
 
+bool SX128x::isIrqSet(uint8_t irq) {
+  uint16_t flags = getIrqStatus();
+  switch(irq) {
+    case RADIOLIB_IRQ_TX_DONE:
+      return(flags & RADIOLIB_SX128X_IRQ_TX_DONE);
+    case RADIOLIB_IRQ_RX_DONE:
+      return(flags & RADIOLIB_SX128X_IRQ_RX_DONE);
+    case RADIOLIB_IRQ_PREAMBLE_DETECTED:
+      return(flags & RADIOLIB_SX128X_IRQ_PREAMBLE_DETECTED);
+    case RADIOLIB_IRQ_SYNC_WORD_VALID:
+      return(flags & RADIOLIB_SX128X_IRQ_SYNC_WORD_VALID);
+    case RADIOLIB_IRQ_SYNC_WORD_ERROR:
+      return(flags & RADIOLIB_SX128X_IRQ_SYNC_WORD_ERROR);
+    case RADIOLIB_IRQ_HEADER_VALID:
+      return(flags & RADIOLIB_SX128X_IRQ_HEADER_VALID);
+    case RADIOLIB_IRQ_HEADER_ERR:
+      return(flags & RADIOLIB_SX128X_IRQ_HEADER_ERROR);
+    case RADIOLIB_IRQ_CRC_ERR:
+      return(flags & RADIOLIB_SX128X_IRQ_CRC_ERROR);
+    case RADIOLIB_IRQ_CAD_DONE:
+      return(flags & RADIOLIB_SX128X_IRQ_CAD_DONE);
+    case RADIOLIB_IRQ_CAD_DETECTED:
+      return(flags & RADIOLIB_SX128X_IRQ_CAD_DETECTED);
+    case RADIOLIB_IRQ_TIMEOUT:
+      return(flags & RADIOLIB_SX128X_IRQ_RX_TX_TIMEOUT);
+    default:
+      return(false);
+  }
+  return(false);
+}
+
 int16_t SX128x::startChannelScan() {
   // check active modem
   if(getPacketType() != RADIOLIB_SX128X_PACKET_TYPE_LORA) {

src/modules/SX128x/SX128x.h

@@ -576,6 +576,12 @@ class SX128x: public PhysicalLayer {
     */
     int16_t readData(uint8_t* data, size_t len) override;
     
+    /*!
+      \brief Check whether a specific IRQ bit is set (e.g. RxTimeout, CadDone).
+      \returns Whether requested IRQ is set.
+    */
+    bool isIrqSet(uint8_t irq) override;
+
     /*!
       \brief Interrupt-driven channel activity detection method. DIO1 will be activated
       when LoRa preamble is detected, or upon timeout. Defaults to CAD parameter values recommended by AN1200.48.