Tx16s sbus in (#7787)

Enable SBUS trainer input

radio/src/targets/horus/trainer_driver.cpp

@@ -20,6 +20,10 @@
 
 #include "opentx.h"
 
+#if defined(SBUS)
+Fifo<uint8_t, 32> trainerSbusFifo;
+#endif
+
 void trainerSendNextFrame();
 
 void init_trainer_ppm()
@@ -152,3 +156,15 @@ extern "C" void TRAINER_TIMER_IRQHandler()
     trainerSendNextFrame();
   }
 }
+
+int sbusGetByte(uint8_t * byte)
+{
+  switch (currentTrainerMode) {
+#if defined(AUX_SERIAL)
+    case TRAINER_MODE_MASTER_BATTERY_COMPARTMENT:
+      return trainerSbusFifo.pop(*byte);
+#endif
+    default:
+      return false;
+  }
+}