From cb7bd533cb2b505441ca9a35c9897db358a30b47 Mon Sep 17 00:00:00 2001
From: Mike Beattie <mike@ethernal.org>
Date: Tue, 20 Mar 2012 23:25:17 +1300
Subject: Add Time library

Signed-off-by: Mike Beattie <mike@ethernal.org>
---
 DS1307RTC/DS1307RTC.cpp | 124 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 DS1307RTC/DS1307RTC.cpp

(limited to 'DS1307RTC/DS1307RTC.cpp')

diff --git a/DS1307RTC/DS1307RTC.cpp b/DS1307RTC/DS1307RTC.cpp
new file mode 100644
index 0000000..bf0b46e
--- /dev/null
+++ b/DS1307RTC/DS1307RTC.cpp
@@ -0,0 +1,124 @@
+/*
+ * DS1307RTC.h - library for DS1307 RTC
+  
+  Copyright (c) Michael Margolis 2009
+  This library is intended to be uses with Arduino Time.h library functions
+
+  The library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+  
+  30 Dec 2009 - Initial release
+  5 Sep 2011 updated for Arduino 1.0
+ */
+
+#include <Wire.h>
+#include "DS1307RTC.h"
+
+#define DS1307_CTRL_ID 0x68 
+
+DS1307RTC::DS1307RTC()
+{
+  Wire.begin();
+}
+  
+// PUBLIC FUNCTIONS
+time_t DS1307RTC::get()   // Aquire data from buffer and convert to time_t
+{
+  tmElements_t tm;
+  read(tm);
+  return(makeTime(tm));
+}
+
+void  DS1307RTC::set(time_t t)
+{
+  tmElements_t tm;
+  breakTime(t, tm);
+  tm.Second |= 0x80;  // stop the clock 
+  write(tm); 
+  tm.Second &= 0x7f;  // start the clock
+  write(tm); 
+}
+
+// Aquire data from the RTC chip in BCD format
+void DS1307RTC::read( tmElements_t &tm)
+{
+  Wire.beginTransmission(DS1307_CTRL_ID);
+#if ARDUINO >= 100  
+  Wire.write((uint8_t)0x00); 
+#else
+  Wire.send(0x00);
+#endif  
+  Wire.endTransmission();
+
+  // request the 7 data fields   (secs, min, hr, dow, date, mth, yr)
+  Wire.requestFrom(DS1307_CTRL_ID, tmNbrFields);
+#if ARDUINO >= 100    
+  tm.Second = bcd2dec(Wire.read() & 0x7f);   
+  tm.Minute = bcd2dec(Wire.read() );
+  tm.Hour =   bcd2dec(Wire.read() & 0x3f);  // mask assumes 24hr clock
+  tm.Wday = bcd2dec(Wire.read() );
+  tm.Day = bcd2dec(Wire.read() );
+  tm.Month = bcd2dec(Wire.read() );
+  tm.Year = y2kYearToTm((bcd2dec(Wire.read())));
+#else
+  tm.Second = bcd2dec(Wire.receive() & 0x7f);   
+  tm.Minute = bcd2dec(Wire.receive() );
+  tm.Hour =   bcd2dec(Wire.receive() & 0x3f);  // mask assumes 24hr clock
+  tm.Wday = bcd2dec(Wire.receive() );
+  tm.Day = bcd2dec(Wire.receive() );
+  tm.Month = bcd2dec(Wire.receive() );
+  tm.Year = y2kYearToTm((bcd2dec(Wire.receive())));
+#endif  
+}
+
+void DS1307RTC::write(tmElements_t &tm)
+{
+  Wire.beginTransmission(DS1307_CTRL_ID);
+#if ARDUINO >= 100  
+  Wire.write((uint8_t)0x00); // reset register pointer  
+  Wire.write(dec2bcd(tm.Second)) ;   
+  Wire.write(dec2bcd(tm.Minute));
+  Wire.write(dec2bcd(tm.Hour));      // sets 24 hour format
+  Wire.write(dec2bcd(tm.Wday));   
+  Wire.write(dec2bcd(tm.Day));
+  Wire.write(dec2bcd(tm.Month));
+  Wire.write(dec2bcd(tmYearToY2k(tm.Year))); 
+#else  
+  Wire.send(0x00); // reset register pointer  
+  Wire.send(dec2bcd(tm.Second)) ;   
+  Wire.send(dec2bcd(tm.Minute));
+  Wire.send(dec2bcd(tm.Hour));      // sets 24 hour format
+  Wire.send(dec2bcd(tm.Wday));   
+  Wire.send(dec2bcd(tm.Day));
+  Wire.send(dec2bcd(tm.Month));
+  Wire.send(dec2bcd(tmYearToY2k(tm.Year)));   
+#endif
+  Wire.endTransmission();  
+}
+// PRIVATE FUNCTIONS
+
+// Convert Decimal to Binary Coded Decimal (BCD)
+uint8_t DS1307RTC::dec2bcd(uint8_t num)
+{
+  return ((num/10 * 16) + (num % 10));
+}
+
+// Convert Binary Coded Decimal (BCD) to Decimal
+uint8_t DS1307RTC::bcd2dec(uint8_t num)
+{
+  return ((num/16 * 10) + (num % 16));
+}
+
+DS1307RTC RTC = DS1307RTC(); // create an instance for the user
+
-- 
cgit v1.2.3