From eb15866f5138fbba9c0142dd0af30dcd31535a30 Mon Sep 17 00:00:00 2001
From: Jacob Hageman <jacob.hageman@nasa.gov>
Date: Thu, 28 May 2020 11:38:14 -0400
Subject: [PATCH] Fix #80, Checksum now matches cFS

---
 Subsystems/cmdUtil/cmdUtil.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Subsystems/cmdUtil/cmdUtil.c b/Subsystems/cmdUtil/cmdUtil.c
index bf1508e..2f7e3cc 100644
--- a/Subsystems/cmdUtil/cmdUtil.c
+++ b/Subsystems/cmdUtil/cmdUtil.c
@@ -395,10 +395,11 @@ void CopyData(unsigned char *pkt, unsigned int *startbyte, char *in, unsigned in
 
 /******************************************************************************
  * Calculate cFS Secondary Header Checksum
+ * Note - this matches cFS checksum calc in framework
  */
 unsigned char CalcChecksum(unsigned char *bbuf, unsigned int nbytes)
 {
-    unsigned char checksum = 0;
+    unsigned char checksum = 0xFF;
 
     for (unsigned int i = 0; i < nbytes; i++)
         checksum ^= bbuf[i];