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1 /*
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2 * DS1307 headers
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3 *
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4 * Copyright (c) 2008
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5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #define IIC_STFAIL -1
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30 #define IIC_FAILARB -2
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31 #define IIC_SLNAK -3
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32 #define IIC_NOREPLY -4
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33 #define IIC_UNKNOWN -99
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34
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35 #define DS1307_ADR 0xd0 // DS1307's TWI address
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36
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37 typedef struct {
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38 uint8_t year;
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39 uint8_t month;
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40 uint8_t day;
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41 uint8_t hour;
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42 uint8_t min;
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43 uint8_t sec;
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44
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45 uint8_t ctrl;
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46 uint8_t ram[56];
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47 } ds1307_t;
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48
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49 typedef union {
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50 uint8_t raw[8];
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51 struct {
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52 uint8_t sec : 4;
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53 uint8_t sec10 : 3; // Seconds (0-59)
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54 uint8_t ch : 1; // Clock enable (1 = off)
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55
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56 uint8_t min : 4;
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57 uint8_t min10 : 3; // Minutes (0-59)
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58 uint8_t pad0 : 1;
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59
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60 uint8_t hour : 4;
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61 uint8_t hour10 : 1; // Hours
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62 uint8_t pmam : 1; // AM/PM => 1 = PM or extra bit for hour10
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63 uint8_t s1224 : 1; // 1 = 12 hour mode
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64 uint8_t pad1 : 1;
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65
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66 uint8_t dow : 3; // Day of the week (1-7)
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67 uint8_t pad2 : 5;
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68
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69 uint8_t day : 4;
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70 uint8_t day10 : 2; // Day of the month (1-31)
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71 uint8_t pad3 : 2;
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72
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73 uint8_t month : 4;
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74 uint8_t month10 : 1;
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75 uint8_t pad4 : 3; // Month (1-12)
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76
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77 uint8_t year : 4;
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78 uint8_t year10 : 4; // Year (0-99)
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79
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80 uint8_t rs : 2; // Rate select
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81 uint8_t pad6 : 2;
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82 uint8_t sqwe : 1; // Square wave enable
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83 uint8_t pad5 : 2;
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84 uint8_t out : 1; // Output control enable
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85 } split;
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86 } ds1307raw_t;
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87
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88 int ds1307_init(void);
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89 int8_t iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
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90 int8_t iic_write(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla);
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91 int8_t ds1307_gettod(ds1307raw_t *time);
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92 int8_t ds1307_settod(char *date);
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93 void ds1307_printtime(char *leader, char *trailer);
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