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DS1337.cpp@0:f4f9b627adf9, 2014-04-01 (annotated)
- Committer:
- loovee
- Date:
- Tue Apr 01 07:01:08 2014 +0000
- Revision:
- 0:f4f9b627adf9
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Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
loovee | 0:f4f9b627adf9 | 1 | |
loovee | 0:f4f9b627adf9 | 2 | #include "DS1337.h" |
loovee | 0:f4f9b627adf9 | 3 | |
loovee | 0:f4f9b627adf9 | 4 | |
loovee | 0:f4f9b627adf9 | 5 | // NOTE: To keep the math from getting even more lengthy/annoying than it already is, the following constraints are imposed: |
loovee | 0:f4f9b627adf9 | 6 | // 1) All times are in 24-hour format (military time) |
loovee | 0:f4f9b627adf9 | 7 | // 2) DayOfWeek field is not used internally or checked for validity. Alarm functions may optionally set alarms repeating on DayOfWeek, but this feature has not been tested yet. |
loovee | 0:f4f9b627adf9 | 8 | // 3) This library's buffer stores all times in raw BCD format, just as it is sent from the RTC. |
loovee | 0:f4f9b627adf9 | 9 | // It is not converted to/from 'real' (binary) values until needed via get...() and set...() functions. |
loovee | 0:f4f9b627adf9 | 10 | // In other words, don't go hacking around and reading from the rtc_bcd[] buffer directly, unless you want the raw BCD results. |
loovee | 0:f4f9b627adf9 | 11 | |
loovee | 0:f4f9b627adf9 | 12 | |
loovee | 0:f4f9b627adf9 | 13 | // Cumulative number of days elapsed at the start of each month, assuming a normal (non-leap) year. |
loovee | 0:f4f9b627adf9 | 14 | unsigned int monthdays[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; |
loovee | 0:f4f9b627adf9 | 15 | |
loovee | 0:f4f9b627adf9 | 16 | |
loovee | 0:f4f9b627adf9 | 17 | extern I2C i2c; |
loovee | 0:f4f9b627adf9 | 18 | |
loovee | 0:f4f9b627adf9 | 19 | unsigned char DS1337::getRegister(unsigned char registerNumber) |
loovee | 0:f4f9b627adf9 | 20 | { |
loovee | 0:f4f9b627adf9 | 21 | uint8_t val = registerNumber; |
loovee | 0:f4f9b627adf9 | 22 | |
loovee | 0:f4f9b627adf9 | 23 | i2c.write(DS1337_CTRL_ID,(char *)&val,1); |
loovee | 0:f4f9b627adf9 | 24 | i2c.stop(); |
loovee | 0:f4f9b627adf9 | 25 | i2c.read(DS1337_CTRL_ID, (char *)&val, 1); |
loovee | 0:f4f9b627adf9 | 26 | return val; |
loovee | 0:f4f9b627adf9 | 27 | } |
loovee | 0:f4f9b627adf9 | 28 | |
loovee | 0:f4f9b627adf9 | 29 | void DS1337::setRegister(unsigned char registerNumber, unsigned char value) |
loovee | 0:f4f9b627adf9 | 30 | { |
loovee | 0:f4f9b627adf9 | 31 | uint8_t val[2]; |
loovee | 0:f4f9b627adf9 | 32 | val[0] = registerNumber; |
loovee | 0:f4f9b627adf9 | 33 | val[1] = value; |
loovee | 0:f4f9b627adf9 | 34 | i2c.write(DS1337_CTRL_ID, (char *)val, 2); |
loovee | 0:f4f9b627adf9 | 35 | } |
loovee | 0:f4f9b627adf9 | 36 | |
loovee | 0:f4f9b627adf9 | 37 | void DS1337::readTime(void) |
loovee | 0:f4f9b627adf9 | 38 | { |
loovee | 0:f4f9b627adf9 | 39 | uint8_t val = 0x00; |
loovee | 0:f4f9b627adf9 | 40 | |
loovee | 0:f4f9b627adf9 | 41 | i2c.write(DS1337_CTRL_ID,(char *)&val,1); |
loovee | 0:f4f9b627adf9 | 42 | i2c.stop(); |
loovee | 0:f4f9b627adf9 | 43 | i2c.read(DS1337_CTRL_ID, (char *)rtc_bcd, 7); |
loovee | 0:f4f9b627adf9 | 44 | } |
loovee | 0:f4f9b627adf9 | 45 | |
loovee | 0:f4f9b627adf9 | 46 | unsigned char DS1337::getSeconds() |
loovee | 0:f4f9b627adf9 | 47 | { |
loovee | 0:f4f9b627adf9 | 48 | return bcd2bin(rtc_bcd[DS1337_SEC]); |
loovee | 0:f4f9b627adf9 | 49 | } |
loovee | 0:f4f9b627adf9 | 50 | |
loovee | 0:f4f9b627adf9 | 51 | unsigned char DS1337::getMinutes() |
loovee | 0:f4f9b627adf9 | 52 | { |
loovee | 0:f4f9b627adf9 | 53 | return bcd2bin(rtc_bcd[DS1337_MIN]); |
loovee | 0:f4f9b627adf9 | 54 | } |
loovee | 0:f4f9b627adf9 | 55 | unsigned char DS1337::getHours() |
loovee | 0:f4f9b627adf9 | 56 | { |
loovee | 0:f4f9b627adf9 | 57 | return bcd2bin(rtc_bcd[DS1337_HR]); |
loovee | 0:f4f9b627adf9 | 58 | } |
loovee | 0:f4f9b627adf9 | 59 | unsigned char DS1337::getDays() |
loovee | 0:f4f9b627adf9 | 60 | { |
loovee | 0:f4f9b627adf9 | 61 | return bcd2bin(rtc_bcd[DS1337_DATE]); |
loovee | 0:f4f9b627adf9 | 62 | } |
loovee | 0:f4f9b627adf9 | 63 | unsigned char DS1337::getDayOfWeek() |
loovee | 0:f4f9b627adf9 | 64 | { |
loovee | 0:f4f9b627adf9 | 65 | return bcd2bin(rtc_bcd[DS1337_DOW]); |
loovee | 0:f4f9b627adf9 | 66 | } |
loovee | 0:f4f9b627adf9 | 67 | unsigned char DS1337::getMonths() |
loovee | 0:f4f9b627adf9 | 68 | { |
loovee | 0:f4f9b627adf9 | 69 | return bcd2bin(rtc_bcd[DS1337_MTH]); |
loovee | 0:f4f9b627adf9 | 70 | } |
loovee | 0:f4f9b627adf9 | 71 | unsigned int DS1337::getYears() |
loovee | 0:f4f9b627adf9 | 72 | { |
loovee | 0:f4f9b627adf9 | 73 | return 2000 + bcd2bin(rtc_bcd[DS1337_YR]); |
loovee | 0:f4f9b627adf9 | 74 | } |
loovee | 0:f4f9b627adf9 | 75 | |
loovee | 0:f4f9b627adf9 | 76 | |
loovee | 0:f4f9b627adf9 | 77 | void DS1337::setSeconds(unsigned char v) |
loovee | 0:f4f9b627adf9 | 78 | { |
loovee | 0:f4f9b627adf9 | 79 | rtc_bcd[DS1337_SEC] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 80 | |
loovee | 0:f4f9b627adf9 | 81 | } |
loovee | 0:f4f9b627adf9 | 82 | void DS1337::setMinutes(unsigned char v) |
loovee | 0:f4f9b627adf9 | 83 | { |
loovee | 0:f4f9b627adf9 | 84 | rtc_bcd[DS1337_MIN] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 85 | |
loovee | 0:f4f9b627adf9 | 86 | } |
loovee | 0:f4f9b627adf9 | 87 | void DS1337::setHours(unsigned char v) |
loovee | 0:f4f9b627adf9 | 88 | { |
loovee | 0:f4f9b627adf9 | 89 | rtc_bcd[DS1337_HR] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 90 | |
loovee | 0:f4f9b627adf9 | 91 | } |
loovee | 0:f4f9b627adf9 | 92 | void DS1337::setDays(unsigned char v) |
loovee | 0:f4f9b627adf9 | 93 | { |
loovee | 0:f4f9b627adf9 | 94 | rtc_bcd[DS1337_DATE] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 95 | |
loovee | 0:f4f9b627adf9 | 96 | } |
loovee | 0:f4f9b627adf9 | 97 | void DS1337::setDayOfWeek(unsigned char v) |
loovee | 0:f4f9b627adf9 | 98 | { |
loovee | 0:f4f9b627adf9 | 99 | rtc_bcd[DS1337_DOW] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 100 | |
loovee | 0:f4f9b627adf9 | 101 | } |
loovee | 0:f4f9b627adf9 | 102 | void DS1337::setMonths(unsigned char v) |
loovee | 0:f4f9b627adf9 | 103 | { |
loovee | 0:f4f9b627adf9 | 104 | rtc_bcd[DS1337_MTH] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 105 | |
loovee | 0:f4f9b627adf9 | 106 | } |
loovee | 0:f4f9b627adf9 | 107 | void DS1337::setYears(unsigned int v) |
loovee | 0:f4f9b627adf9 | 108 | { |
loovee | 0:f4f9b627adf9 | 109 | if (v>1999) |
loovee | 0:f4f9b627adf9 | 110 | { |
loovee | 0:f4f9b627adf9 | 111 | v -= 2000; |
loovee | 0:f4f9b627adf9 | 112 | } |
loovee | 0:f4f9b627adf9 | 113 | rtc_bcd[DS1337_YR] = bin2bcd(v); |
loovee | 0:f4f9b627adf9 | 114 | |
loovee | 0:f4f9b627adf9 | 115 | } |
loovee | 0:f4f9b627adf9 | 116 | |
loovee | 0:f4f9b627adf9 | 117 | void DS1337::setTime() |
loovee | 0:f4f9b627adf9 | 118 | { |
loovee | 0:f4f9b627adf9 | 119 | char set_[8]; |
loovee | 0:f4f9b627adf9 | 120 | set_[0] = 0x00; |
loovee | 0:f4f9b627adf9 | 121 | for(int i=0; i<7; i++) |
loovee | 0:f4f9b627adf9 | 122 | { |
loovee | 0:f4f9b627adf9 | 123 | set_[i+1] = rtc_bcd[i]; |
loovee | 0:f4f9b627adf9 | 124 | } |
loovee | 0:f4f9b627adf9 | 125 | i2c.write(DS1337_CTRL_ID, set_, 8); |
loovee | 0:f4f9b627adf9 | 126 | } |
loovee | 0:f4f9b627adf9 | 127 | |
loovee | 0:f4f9b627adf9 | 128 | byte DS1337::bcd2bin(byte v) |
loovee | 0:f4f9b627adf9 | 129 | { |
loovee | 0:f4f9b627adf9 | 130 | return (v&0x0F) + ((v>>4)*10); |
loovee | 0:f4f9b627adf9 | 131 | } |
loovee | 0:f4f9b627adf9 | 132 | |
loovee | 0:f4f9b627adf9 | 133 | byte DS1337::bin2bcd(byte v) |
loovee | 0:f4f9b627adf9 | 134 | { |
loovee | 0:f4f9b627adf9 | 135 | return ((v / 10)<<4) + (v % 10); |
loovee | 0:f4f9b627adf9 | 136 | } |
loovee | 0:f4f9b627adf9 | 137 | |
loovee | 0:f4f9b627adf9 | 138 | void DS1337::stop(void) |
loovee | 0:f4f9b627adf9 | 139 | { |
loovee | 0:f4f9b627adf9 | 140 | setRegister(DS1337_SP, getRegister(DS1337_SP) | DS1337_SP_EOSC); |
loovee | 0:f4f9b627adf9 | 141 | } |
loovee | 0:f4f9b627adf9 | 142 | |
loovee | 0:f4f9b627adf9 | 143 | void DS1337::start(void) |
loovee | 0:f4f9b627adf9 | 144 | { |
loovee | 0:f4f9b627adf9 | 145 | setRegister(DS1337_SP, getRegister(DS1337_SP) & !DS1337_SP_EOSC); |
loovee | 0:f4f9b627adf9 | 146 | } |