RC_Channel: added FPort pad option

libraries/RC_Channel/RC_Channel.h

@@ -341,6 +341,11 @@ public:
         return get_singleton() != nullptr && (_options & uint32_t(Option::IGNORE_FAILSAFE));
     }
 
+    // should we add a pad byte to Fport data
+    bool fport_pad(void) const {
+        return get_singleton() != nullptr && (_options & uint32_t(Option::FPORT_PAD));
+    }
+
     bool ignore_overrides() const {
         return _options & uint32_t(Option::IGNORE_OVERRIDES);
     }
@@ -366,6 +371,7 @@ protected:
         IGNORE_RECEIVER  = (1 << 0), // RC receiver modules
         IGNORE_OVERRIDES = (1 << 1), // MAVLink overrides
         IGNORE_FAILSAFE  = (1 << 2), // ignore RC failsafe bits
+        FPORT_PAD        = (1 << 3), // pad fport telem output
     };
 
     void new_override_received() {

libraries/RC_Channel/RC_Channels_VarInfo.h

@@ -86,7 +86,7 @@ const AP_Param::GroupInfo RC_Channels::var_info[] = {
     // @DisplayName: RC options
     // @Description: RC input options
     // @User: Advanced
-    // @Bitmask: 0:Ignore RC Receiver, 1:Ignore MAVLink Overrides, 2:Ignore Receiver Failsafe
+    // @Bitmask: 0:Ignore RC Receiver, 1:Ignore MAVLink Overrides, 2:Ignore Receiver Failsafe, 3:FPort Pad
     AP_GROUPINFO("_OPTIONS", 33, RC_CHANNELS_SUBCLASS, _options, 0),
 
     AP_GROUPEND