[nRF24] Added "isCarrierDetected()"

src/modules/nRF24/nRF24.cpp

@@ -423,6 +423,10 @@ int16_t nRF24::getStatus(uint8_t mask) {
   return(_mod->SPIgetRegValue(NRF24_REG_STATUS) & mask);
 }
 
+bool nRF24::isCarrierDetected() {
+  return(_mod->SPIgetRegValue(NRF24_REG_RPD, 0,0)) == 1;
+}
+
 int16_t nRF24::setFrequencyDeviation(float freqDev) {
   // nRF24 is unable to set frequency deviation
   // this method is implemented only for PhysicalLayer compatibility

src/modules/nRF24/nRF24.h

@@ -392,6 +392,13 @@ class nRF24: public PhysicalLayer {
     */
     int16_t getStatus(uint8_t mask = 0xFF);
 
+    /*!
+      \brief Checks if carrier was detected during last RX
+
+      \returns Whatever the carrier was above threshold.
+    */
+    bool isCarrierDetected();
+
     /*!
       \brief Dummy configuration method, to ensure PhysicalLayer compatibility.