packed the control data struct
diff --git a/aos/atom_code/input/FRCComm.h b/aos/atom_code/input/FRCComm.h
index 14c4602..98619de 100644
--- a/aos/atom_code/input/FRCComm.h
+++ b/aos/atom_code/input/FRCComm.h
@@ -124,7 +124,6 @@
 	UINT32 FPGAChecksum3;
 
 	char versionData[8];
-};
-
+} __attribute__((packed));
 
 #endif