--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ds1307.h	Thu Oct 30 11:53:32 2008 +1030
@@ -0,0 +1,93 @@
+/*
+ * DS1307 headers
+ *
+ * Copyright (c) 2008
+ *      Daniel O'Connor <darius@dons.net.au>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#define IIC_STFAIL	-1
+#define IIC_FAILARB	-2
+#define IIC_SLNAK	-3
+#define IIC_NOREPLY	-4
+#define IIC_UNKNOWN	-99
+
+#define DS1307_ADR	0xd0	// DS1307's TWI address
+
+typedef struct {
+    uint8_t	year;
+    uint8_t	month;
+    uint8_t	day;
+    uint8_t	hour;
+    uint8_t	min;
+    uint8_t	sec;
+
+    uint8_t	ctrl;
+    uint8_t	ram[56];
+} ds1307_t;
+
+typedef union {
+    uint8_t	raw[8];
+    struct {
+	uint8_t sec	: 4;
+	uint8_t	sec10	: 3;	// Seconds (0-59)
+	uint8_t	ch	: 1;	// Clock enable (1 = off)
+	
+	uint8_t min	: 4;
+	uint8_t min10	: 3;	// Minutes (0-59)
+	uint8_t	pad0	: 1;
+	
+	uint8_t hour	: 4;
+	uint8_t	hour10	: 1;	// Hours
+	uint8_t	pmam	: 1;	// AM/PM => 1 = PM or extra bit for hour10
+	uint8_t	s1224	: 1;	// 1 = 12 hour mode
+	uint8_t pad1	: 1;
+
+	uint8_t dow	: 3;	// Day of the week (1-7)
+	uint8_t	pad2	: 5;	
+	
+	uint8_t	day	: 4;
+	uint8_t day10	: 2;	// Day of the month (1-31)
+	uint8_t pad3	: 2;
+	
+	uint8_t month	: 4;
+	uint8_t month10	: 1;
+	uint8_t	pad4 	: 3;	// Month (1-12)
+	
+	uint8_t year	: 4;
+	uint8_t	year10	: 4;	// Year (0-99)
+	
+	uint8_t	rs	: 2;	// Rate select
+	uint8_t	pad6	: 2;
+	uint8_t sqwe	: 1;	// Square wave enable
+	uint8_t pad5	: 2;
+	uint8_t	out	: 1;	// Output control enable
+    } split;
+} ds1307raw_t;
+	
+int	ds1307_init(void);
+int	iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
+int	iic_write(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
+int	ds1307_gettod(ds1307raw_t *time);
+int	ds1307_settod(char *date);
+void	ds1307_printtime(char *leader, char *trailer);