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comparison ds1307.h @ 60:50fca9562310

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Add support for reading/writing to a DS1307 over TWI/IIC. Note that iic_read() appears to have a bug where it stops 1 byte earlier than expected, work around it for now by adding 1 in the gettod() function. tempctrl.c now prints the TOD as read from the RTC for each line.
author darius@Inchoate
date Thu, 30 Oct 2008 11:53:32 +1030
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59:c72cf25881fe 60:50fca9562310
1 /*
2 * DS1307 headers
3 *
4 * Copyright (c) 2008
5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #define IIC_STFAIL -1
30 #define IIC_FAILARB -2
31 #define IIC_SLNAK -3
32 #define IIC_NOREPLY -4
33 #define IIC_UNKNOWN -99
34
35 #define DS1307_ADR 0xd0 // DS1307's TWI address
36
37 typedef struct {
38 uint8_t year;
39 uint8_t month;
40 uint8_t day;
41 uint8_t hour;
42 uint8_t min;
43 uint8_t sec;
44
45 uint8_t ctrl;
46 uint8_t ram[56];
47 } ds1307_t;
48
49 typedef union {
50 uint8_t raw[8];
51 struct {
52 uint8_t sec : 4;
53 uint8_t sec10 : 3; // Seconds (0-59)
54 uint8_t ch : 1; // Clock enable (1 = off)
55
56 uint8_t min : 4;
57 uint8_t min10 : 3; // Minutes (0-59)
58 uint8_t pad0 : 1;
59
60 uint8_t hour : 4;
61 uint8_t hour10 : 1; // Hours
62 uint8_t pmam : 1; // AM/PM => 1 = PM or extra bit for hour10
63 uint8_t s1224 : 1; // 1 = 12 hour mode
64 uint8_t pad1 : 1;
65
66 uint8_t dow : 3; // Day of the week (1-7)
67 uint8_t pad2 : 5;
68
69 uint8_t day : 4;
70 uint8_t day10 : 2; // Day of the month (1-31)
71 uint8_t pad3 : 2;
72
73 uint8_t month : 4;
74 uint8_t month10 : 1;
75 uint8_t pad4 : 3; // Month (1-12)
76
77 uint8_t year : 4;
78 uint8_t year10 : 4; // Year (0-99)
79
80 uint8_t rs : 2; // Rate select
81 uint8_t pad6 : 2;
82 uint8_t sqwe : 1; // Square wave enable
83 uint8_t pad5 : 2;
84 uint8_t out : 1; // Output control enable
85 } split;
86 } ds1307raw_t;
87
88 int ds1307_init(void);
89 int iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
90 int iic_write(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
91 int ds1307_gettod(ds1307raw_t *time);
92 int ds1307_settod(char *date);
93 void ds1307_printtime(char *leader, char *trailer);