From 0dc9cd95010ac7ae60141629367d60472084f132 Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <elena.valhalla@gmail.com>
Date: Thu, 26 Jan 2012 07:04:08 +0100
Subject: arduino sketch: fix loading of status after lack of power

---
 .../fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde    | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'arduino_sketch/fuzzy_alarm_clock_ds1307')

diff --git a/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde b/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
index 090f14e..1b5fd89 100644
--- a/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
+++ b/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
@@ -44,7 +44,7 @@
 int st = 0; // alarm status (minutes from alarm - TIN)
 char alarms[NALARMS][5]; // alarm settings
 char cmin; // current minute
-int a = -1; // current alarm
+signed char a = -1; // current alarm
 char dbg = 0; // print debug informations
 bool ringing = false; // sound the alarm
 bool pressed = false; // stop button status
@@ -88,10 +88,12 @@ void setup () {
         cmin = RTC.readData(0x0a);
         // This only works if the arduino had no power for a 
         // "short" time. This is by design. :D
-        RTC.readClock();
-        st = st + (RTC.getMinutes() - cmin) % 60;
-        cmin = RTC.getMinutes();
-        save_status();
+        if ( a >= 0 ) {
+            RTC.readClock();
+            st = st + (RTC.getMinutes() - cmin) % 60;
+            cmin = RTC.getMinutes();
+            save_status();
+        }
         for ( int i = 0; i < NALARMS ; i ++ ) {
             for ( int j = 0; j < 5 ; j ++ ) {
                 alarms[i][j] = RTC.readData(0x0b + i*5 + j);
-- 
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