From f94d04a9406f7c21a52f3c72b45c42a6a2268652 Mon Sep 17 00:00:00 2001
From: David Crocker <dcrocker@eschertech.com>
Date: Wed, 21 Sep 2022 02:25:10 +0100
Subject: Improved error message when M950 D used in SBC mode

---
 src/Platform/Platform.cpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/Platform/Platform.cpp b/src/Platform/Platform.cpp
index 0a91998c..22c8fa31 100644
--- a/src/Platform/Platform.cpp
+++ b/src/Platform/Platform.cpp
@@ -4583,16 +4583,21 @@ GCodeResult Platform::ConfigurePort(GCodeBuffer& gb, const StringRef& reply) THR
 #ifdef DUET3_MB6HC
 	case 64:	// D
 # if HAS_SBC_INTERFACE
-		if (!reprap.UsingSbcInterface())
-# endif
+		if (reprap.UsingSbcInterface())
 		{
-			return MassStorage::ConfigureSdCard(gb, reply);
+			reply.copy("SD card not supported in SBC mode");
+			return GCodeResult::error;
 		}
+# endif
+		return MassStorage::ConfigureSdCard(gb, reply);
 #endif
-		//no break
 
 	default:
+#ifdef DUET3_MB6HC
+		reply.copy("exactly one of FHJPSRD must be given");
+#else
 		reply.copy("exactly one of FHJPSR must be given");
+#endif
 		return GCodeResult::error;
 	}
 }
-- 
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