From 374a38c9d9e354c6e672da6c897edf405362e185 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sun, 27 Jan 2013 22:49:39 +0000
Subject: sharing credit

git-svn-id: https://svn.spreadspace.org/avr/trunk@77 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-i2c-sl018/update-keys.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'usb-i2c-sl018')

diff --git a/usb-i2c-sl018/update-keys.c b/usb-i2c-sl018/update-keys.c
index 5b80c97..9343c3c 100644
--- a/usb-i2c-sl018/update-keys.c
+++ b/usb-i2c-sl018/update-keys.c
@@ -27,6 +27,8 @@
 #define KEY_LEN_MAX 7
 #define MAX_KEYS 128
 
+/* this generates a Fletcher8 checksum  */
+/* code from: http://stackoverflow.com/questions/13491700/8-bit-fletcher-checksum-of-16-byte-data */
 char generate_csum(char* data)
 {
   uint16_t sum1 = 0xf, sum2 = 0xf, len = KEY_LEN_MAX;
-- 
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