From 1643b2cfb8fe7dfc7b3c2d57190a540c87b4e87a Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <elena.valhalla@gmail.com>
Date: Fri, 2 Sep 2011 10:42:22 +0200
Subject: [PATCH] Read backed up status from the DS1307 (partial)

---
 ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde | 42 ++++++++++++++++++----
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde b/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
index bf1c8f2..fd0682c 100644
--- a/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
+++ b/ds1307/arduino_sketch/fuzzy_alarm_clock_ds1307.pde
@@ -7,7 +7,7 @@
 // "dawn" + "daylight" + blue blinding light
 #define TOUT 75
 
-// number of available alarms
+// number of available alarms; max 10 for storage in the DS1307 ram 
 #define NALARMS 4
 
 // pins and addressed
@@ -25,7 +25,6 @@ void setup () {
     Serial.begin(9600);
     Wire.begin();
     
-    set_time(11,9,2,5,0,0,0);
 
     pinMode(RPIN,OUTPUT);
     pinMode(YPIN,OUTPUT);
@@ -35,12 +34,41 @@ void setup () {
     digitalWrite(YPIN,0);
     digitalWrite(BPIN,0);
     
-    // read alarms and status from storage
-    for ( int i = 0 ; i < NALARMS ; i ++ ) {
-        alarms[i][0] = 0;
+    // if the RTC is already running read alarms and status
+    Wire.beginTransmission(DS1307_ADDRESS);
+    Wire.send(0);
+    Wire.endTransmission();
+
+    Wire.requestFrom(DS1307_ADDRESS, 1);
+    char running = Wire.receive();
+    running = !(running>>7);
+
+    if ( running ) {
+        Wire.requestFrom(DS1307_ADDRESS, 12 + NALARMS * 5);
+        for (int i = 0; i < 8 ; i ++ ) {
+            Wire.receive();
+        }
+        st = Wire.receive();
+        a = Wire.receive();
+        cmin = Wire.receive();
+        for ( int i = 0; i < NALARMS ; i ++ ) {
+            for ( int j = 0; j < 5 ; j ++ ) {
+                alarms[i][j] = Wire.receive();
+            }
+        }
+    } else {
+        for ( int i = 0 ; i < NALARMS ; i ++ ) {
+            for ( int j = 0; j < 5 ; j ++ ) {
+                alarms[i][j] = 0;
+            }
+        }
+        st = 0;
+        a = -1;
+        // DEBUG: we don't want to set the time until we receive 
+        // it from serial, but serial is not implemented yet
+        set_time(11,9,2,5,0,0,0);
     }
-    st = 0;
-    a = -1;
+    
 }
 
 void loop () {
-- 
2.11.4.GIT