From: Pat Thoyts <patthoyts@users.sourceforge.net>
Date: Wed, 6 Nov 2013 22:18:25 +0000 (+0000)
Subject: Change fuse settings to preserve the eeprom when reprogramming.
X-Git-Url: https://privyetmir.co.uk/gitweb.cgi?a=commitdiff_plain;h=3cba1352cc8fcf74d6d965ceb2a22c2185f9e0a6;p=hid_keyb

Change fuse settings to preserve the eeprom when reprogramming.

This allows the serial number and calibration setting to be written once
and preserved subsequently.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
---

diff --git a/Makefile b/Makefile
index 00c04f7..06df256 100644
--- a/Makefile
+++ b/Makefile
@@ -64,8 +64,9 @@ flash:	all
 #        +-------------------- CKDIV8 (divide clock by 8 -> don't divide)
 # For 16.5MHz internal: -U hfuse:w:0xdd:m -U lfuse:w:0xe1:m
 # For 12MHz crystal: -U hfuse:w:0xdd:m -U lfuse:w:0b11111111:m
+# Note: 0xd5 is as per 0xdd but with EESAVE enabled.
 fuse:
-	$(AVRDUDE) -U hfuse:w:0xdd:m -U lfuse:w:0xe1:m
+	$(AVRDUDE) -U hfuse:w:0xd5:m -U lfuse:w:0xe1:m
 
 readcal:
 	$(AVRDUDE) -U calibration:r:/dev/stdout:i | head -1