From 63a56f4fe1cb972e87fcb8bb9150b0fa0f1306cf Mon Sep 17 00:00:00 2001
From: Jakob Schlyter <jakob@kirei.se>
Date: Sat, 16 Jul 2016 10:22:30 +0200
Subject: usage

---
 upload.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/upload.sh b/upload.sh
index d34d4ed..62b906a 100755
--- a/upload.sh
+++ b/upload.sh
@@ -1,6 +1,10 @@
 #! /bin/sh
 
 HEXFILE=$1
-[ -z "$HEXFILE" ] && exit 1
+
+if [ -z "$HEXFILE" ]; then
+	echo "usage: $0 [hexfile]"
+	exit 1
+fi
 
 avrdude -c usbtiny -p attiny828 -U flash:w:$HEXFILE
-- 
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