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-rw-r--r--Demos/Device/ClassDriver/DualCDC/Descriptors.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/Demos/Device/ClassDriver/DualCDC/Descriptors.h b/Demos/Device/ClassDriver/DualCDC/Descriptors.h
index 49befad38..739303edd 100644
--- a/Demos/Device/ClassDriver/DualCDC/Descriptors.h
+++ b/Demos/Device/ClassDriver/DualCDC/Descriptors.h
@@ -42,6 +42,10 @@
#include <LUFA/Drivers/USB/USB.h>
#include <LUFA/Drivers/USB/Class/CDC.h>
+ #if (USE_INTERNAL_SERIAL == NO_DESCRIPTOR)
+ #warning USE_INTERNAL_SERIAL is not available on this AVR - please manually construct a device serial descriptor.
+ #endif
+
/* Macros: */
/** Endpoint number of the first CDC interface's device-to-host notification IN endpoint. */
#define CDC1_NOTIFICATION_EPNUM 3