From 19190fb1347cd586922e4de9d8e41566ebd622d2 Mon Sep 17 00:00:00 2001
From: Peter Barker <pbarker@barker.dropbear.id.au>
Date: Fri, 13 May 2022 14:02:24 +1000
Subject: [PATCH] AP_Airspeed: log airspeed primary changes

---
 libraries/AP_Airspeed/AP_Airspeed.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libraries/AP_Airspeed/AP_Airspeed.cpp b/libraries/AP_Airspeed/AP_Airspeed.cpp
index a0d6d31e79..edff9dc0a2 100644
--- a/libraries/AP_Airspeed/AP_Airspeed.cpp
+++ b/libraries/AP_Airspeed/AP_Airspeed.cpp
@@ -637,6 +637,10 @@ void AP_Airspeed::update()
     }
 #endif
 
+#if HAL_LOGGING_ENABLED
+    const uint8_t old_primary = primary;
+#endif
+
     // setup primary
     if (healthy(primary_sensor.get())) {
         primary = primary_sensor.get();
@@ -652,6 +656,9 @@ void AP_Airspeed::update()
     check_sensor_failures();
 
 #if HAL_LOGGING_ENABLED
+    if (primary != old_primary) {
+        AP::logger().Write_Event(LogEvent::AIRSPEED_PRIMARY_CHANGED);
+    }
     if (_log_bit != (uint32_t)-1 && AP::logger().should_log(_log_bit)) {
         Log_Airspeed();
     }