From 0726043ac0daa5a57f1fa18cf5757c429650ffdf Mon Sep 17 00:00:00 2001
From: Ben Laurie <ben@links.org>
Date: Sun, 8 Sep 2013 06:16:06 +0100
Subject: [PATCH] navdata had better be the same size as a packet.

---
 sw/airborne/boards/ardrone/navdata.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sw/airborne/boards/ardrone/navdata.c b/sw/airborne/boards/ardrone/navdata.c
index baa9332cc8..69a1d66463 100644
--- a/sw/airborne/boards/ardrone/navdata.c
+++ b/sw/airborne/boards/ardrone/navdata.c
@@ -35,6 +35,7 @@
 #include <string.h>
 #include <math.h>
 #include <errno.h>
+#include <assert.h>
 #include "navdata.h"
 
 #define NAVDATA_PACKET_SIZE 60
@@ -271,6 +272,7 @@ void navdata_update()
       if ( 1 ) // we dont know how to calculate the checksum
 //      if ( navdata_checksum() == 0 )
       {
+	assert(sizeof navdata == NAVDATA_PACKET_SIZE);
         memcpy(navdata, port.buffer, NAVDATA_PACKET_SIZE);
 
         // Invert byte order so that TELEMETRY works better