241 lines
6.5 KiB
C++
241 lines
6.5 KiB
C++
// Code by JeeLabs http://news.jeelabs.org/code/
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// Released to the public domain! Enjoy!
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#include <Wire.h>
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#include <avr/pgmspace.h>
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#include "RTClib.h"
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#define DS1307_ADDRESS 0x68
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#define SECONDS_PER_DAY 86400L
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#define SECONDS_FROM_1970_TO_2000 946684800
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#if (ARDUINO >= 100)
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#include <Arduino.h> // capital A so it is error prone on case-sensitive filesystems
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#else
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#include <WProgram.h>
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#endif
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int i = 0; //The new wire library needs to take an int when you are sending for the zero register
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////////////////////////////////////////////////////////////////////////////////
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// utility code, some of this could be exposed in the DateTime API if needed
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const uint8_t daysInMonth [] PROGMEM = { 31,28,31,30,31,30,31,31,30,31,30,31 }; //has to be const or compiler compaints
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// number of days since 2000/01/01, valid for 2001..2099
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static uint16_t date2days(uint16_t y, uint8_t m, uint8_t d) {
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if (y >= 2000)
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y -= 2000;
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uint16_t days = d;
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for (uint8_t i = 1; i < m; ++i)
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days += pgm_read_byte(daysInMonth + i - 1);
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if (m > 2 && y % 4 == 0)
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++days;
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return days + 365 * y + (y + 3) / 4 - 1;
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}
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static long time2long(uint16_t days, uint8_t h, uint8_t m, uint8_t s) {
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return ((days * 24L + h) * 60 + m) * 60 + s;
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}
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////////////////////////////////////////////////////////////////////////////////
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// DateTime implementation - ignores time zones and DST changes
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// NOTE: also ignores leap seconds, see http://en.wikipedia.org/wiki/Leap_second
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DateTime::DateTime (uint32_t t) {
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t -= SECONDS_FROM_1970_TO_2000; // bring to 2000 timestamp from 1970
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ss = t % 60;
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t /= 60;
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mm = t % 60;
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t /= 60;
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hh = t % 24;
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uint16_t days = t / 24;
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uint8_t leap;
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for (yOff = 0; ; ++yOff) {
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leap = yOff % 4 == 0;
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if (days < 365 + leap)
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break;
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days -= 365 + leap;
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}
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for (m = 1; ; ++m) {
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uint8_t daysPerMonth = pgm_read_byte(daysInMonth + m - 1);
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if (leap && m == 2)
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++daysPerMonth;
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if (days < daysPerMonth)
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break;
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days -= daysPerMonth;
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}
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d = days + 1;
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}
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DateTime::DateTime (uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t min, uint8_t sec) {
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if (year >= 2000)
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year -= 2000;
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yOff = year;
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m = month;
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d = day;
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hh = hour;
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mm = min;
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ss = sec;
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}
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static uint8_t conv2d(const char* p) {
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uint8_t v = 0;
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if ('0' <= *p && *p <= '9')
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v = *p - '0';
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return 10 * v + *++p - '0';
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}
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// A convenient constructor for using "the compiler's time":
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// DateTime now (__DATE__, __TIME__);
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// NOTE: using PSTR would further reduce the RAM footprint
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DateTime::DateTime (const char* date, const char* time) {
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// sample input: date = "Dec 26 2009", time = "12:34:56"
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yOff = conv2d(date + 9);
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// Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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switch (date[0]) {
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case 'J': m = date[1] == 'a' ? 1 : m = date[2] == 'n' ? 6 : 7; break;
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case 'F': m = 2; break;
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case 'A': m = date[2] == 'r' ? 4 : 8; break;
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case 'M': m = date[2] == 'r' ? 3 : 5; break;
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case 'S': m = 9; break;
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case 'O': m = 10; break;
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case 'N': m = 11; break;
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case 'D': m = 12; break;
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}
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d = conv2d(date + 4);
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hh = conv2d(time);
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mm = conv2d(time + 3);
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ss = conv2d(time + 6);
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}
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uint8_t DateTime::dayOfWeek() const {
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uint16_t day = date2days(yOff, m, d);
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return (day + 6) % 7; // Jan 1, 2000 is a Saturday, i.e. returns 6
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}
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uint32_t DateTime::unixtime(void) const {
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uint32_t t;
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uint16_t days = date2days(yOff, m, d);
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t = time2long(days, hh, mm, ss);
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t += SECONDS_FROM_1970_TO_2000; // seconds from 1970 to 2000
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return t;
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}
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////////////////////////////////////////////////////////////////////////////////
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// RTC_DS1307 implementation
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static uint8_t bcd2bin (uint8_t val) { return val - 6 * (val >> 4); }
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static uint8_t bin2bcd (uint8_t val) { return val + 6 * (val / 10); }
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uint8_t RTC_DS1307::begin(void) {
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return 1;
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}
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#if (ARDUINO >= 100)
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uint8_t RTC_DS1307::isrunning(void) {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.write(i);
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Wire.endTransmission();
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Wire.requestFrom(DS1307_ADDRESS, 1);
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uint8_t ss = Wire.read();
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return !(ss>>7);
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}
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void RTC_DS1307::adjust(const DateTime& dt) {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.write(i);
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Wire.write(bin2bcd(dt.second()));
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Wire.write(bin2bcd(dt.minute()));
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Wire.write(bin2bcd(dt.hour()));
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Wire.write(bin2bcd(0));
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Wire.write(bin2bcd(dt.day()));
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Wire.write(bin2bcd(dt.month()));
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Wire.write(bin2bcd(dt.year() - 2000));
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Wire.write(i);
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Wire.endTransmission();
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}
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DateTime RTC_DS1307::now() {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.write(i);
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Wire.endTransmission();
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Wire.requestFrom(DS1307_ADDRESS, 7);
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uint8_t ss = bcd2bin(Wire.read() & 0x7F);
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uint8_t mm = bcd2bin(Wire.read());
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uint8_t hh = bcd2bin(Wire.read());
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Wire.read();
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uint8_t d = bcd2bin(Wire.read());
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uint8_t m = bcd2bin(Wire.read());
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uint16_t y = bcd2bin(Wire.read()) + 2000;
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return DateTime (y, m, d, hh, mm, ss);
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}
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#else
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uint8_t RTC_DS1307::isrunning(void) {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.send(i);
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Wire.endTransmission();
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Wire.requestFrom(DS1307_ADDRESS, 1);
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uint8_t ss = Wire.receive();
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return !(ss>>7);
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}
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void RTC_DS1307::adjust(const DateTime& dt) {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.send(i);
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Wire.send(bin2bcd(dt.second()));
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Wire.send(bin2bcd(dt.minute()));
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Wire.send(bin2bcd(dt.hour()));
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Wire.send(bin2bcd(0));
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Wire.send(bin2bcd(dt.day()));
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Wire.send(bin2bcd(dt.month()));
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Wire.send(bin2bcd(dt.year() - 2000));
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Wire.send(i);
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Wire.endTransmission();
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}
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DateTime RTC_DS1307::now() {
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Wire.beginTransmission(DS1307_ADDRESS);
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Wire.send(i);
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Wire.endTransmission();
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Wire.requestFrom(DS1307_ADDRESS, 7);
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uint8_t ss = bcd2bin(Wire.receive() & 0x7F);
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uint8_t mm = bcd2bin(Wire.receive());
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uint8_t hh = bcd2bin(Wire.receive());
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Wire.receive();
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uint8_t d = bcd2bin(Wire.receive());
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uint8_t m = bcd2bin(Wire.receive());
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uint16_t y = bcd2bin(Wire.receive()) + 2000;
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return DateTime (y, m, d, hh, mm, ss);
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}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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// RTC_Millis implementation
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long RTC_Millis::offset = 0;
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void RTC_Millis::adjust(const DateTime& dt) {
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offset = dt.unixtime() - millis() / 1000;
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}
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DateTime RTC_Millis::now() {
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return (uint32_t)(offset + millis() / 1000);
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}
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////////////////////////////////////////////////////////////////////////////////
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