diff --git a/libraries/AP_RCProtocol/AP_RCProtocol_Backend.h b/libraries/AP_RCProtocol/AP_RCProtocol_Backend.h
index cbb0b1135b..e0a128dc30 100644
--- a/libraries/AP_RCProtocol/AP_RCProtocol_Backend.h
+++ b/libraries/AP_RCProtocol/AP_RCProtocol_Backend.h
@@ -95,6 +95,10 @@ public:
         return true;
     }
 
+    bool is_detected() const {
+        return frontend._detected_protocol != AP_RCProtocol::NONE && frontend.backend[frontend._detected_protocol] == this;
+    }
+
 #if AP_VIDEOTX_ENABLED
     // called by static methods to confiig video transmitters:
     static void configure_vtx(uint8_t band, uint8_t channel, uint8_t power, uint8_t pitmode);
diff --git a/libraries/AP_RCProtocol/AP_RCProtocol_CRSF.cpp b/libraries/AP_RCProtocol/AP_RCProtocol_CRSF.cpp
index df47ab768d..b9d68b6390 100644
--- a/libraries/AP_RCProtocol/AP_RCProtocol_CRSF.cpp
+++ b/libraries/AP_RCProtocol/AP_RCProtocol_CRSF.cpp
@@ -302,7 +302,7 @@ void AP_RCProtocol_CRSF::update(void)
 
     // never received RC frames, but have received CRSF frames so make sure we give the telemetry opportunity to run
     uint32_t now = AP_HAL::micros();
-    if (_last_frame_time_us > 0 && (!get_rc_frame_count() || !is_tx_active())
+    if (_last_frame_time_us > 0 && (!get_rc_input_count() || !is_tx_active())
         && now - _last_frame_time_us > CRSF_INTER_FRAME_TIME_US_250HZ) {
         process_telemetry(false);
         _last_frame_time_us = now;