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// Code by JeeLabs http://news.jeelabs.org/code/
// Released to the public domain! Enjoy!
#include <Wire.h>
#include <avr/pgmspace.h>
#include "DS1340lib.h"
#include <WProgram.h>
#define DS1340_ADDRESS 0x68
#define SECONDS_PER_DAY 86400L
#define SECONDS_FROM_1970_TO_2000 946684800
////////////////////////////////////////////////////////////////////////////////
// utility code, some of this could be exposed in the DateTime API if needed
static uint8_t daysInMonth [] PROGMEM = { 31,28,31,30,31,30,31,31,30,31,30,31 };
// number of days since 2000/01/01, valid for 2001..2099
static uint16_t date2days(uint16_t y, uint8_t m, uint8_t d) {
if (y >= 2000)
y -= 2000;
uint16_t days = d;
for (uint8_t i = 1; i < m; ++i)
days += pgm_read_byte(daysInMonth + i - 1);
if (m > 2 && y % 4 == 0)
++days;
return days + 365 * y + (y + 3) / 4 - 1;
}
static long time2long(uint16_t days, uint8_t h, uint8_t m, uint8_t s) {
return ((days * 24L + h) * 60 + m) * 60 + s;
}
////////////////////////////////////////////////////////////////////////////////
// DateTime implementation - ignores time zones and DST changes
// NOTE: also ignores leap seconds, see http://en.wikipedia.org/wiki/Leap_second
DateTime::DateTime (uint32_t t) {
t -= SECONDS_FROM_1970_TO_2000; // bring to 2000 timestamp from 1970
ss = t % 60;
t /= 60;
mm = t % 60;
t /= 60;
hh = t % 24;
uint16_t days = t / 24;
uint8_t leap;
for (yOff = 0; ; ++yOff) {
leap = yOff % 4 == 0;
if (days < 365 + leap)
break;
days -= 365 + leap;
}
for (m = 1; ; ++m) {
uint8_t daysPerMonth = pgm_read_byte(daysInMonth + m - 1);
if (leap && m == 2)
++daysPerMonth;
if (days < daysPerMonth)
break;
days -= daysPerMonth;
}
d = days + 1;
}
DateTime::DateTime (uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t min, uint8_t sec) {
if (year >= 2000)
year -= 2000;
yOff = year;
m = month;
d = day;
hh = hour;
mm = min;
ss = sec;
}
static uint8_t conv2d(const char* p) {
uint8_t v = 0;
if ('0' <= *p && *p <= '9')
v = *p - '0';
return 10 * v + *++p - '0';
}
// A convenient constructor for using "the compiler's time":
// DateTime now (__DATE__, __TIME__);
// NOTE: using PSTR would further reduce the RAM footprint
DateTime::DateTime (const char* date, const char* time) {
// sample input: date = "Dec 26 2009", time = "12:34:56"
yOff = conv2d(date + 9);
// Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
switch (date[0]) {
case 'J': m = date[1] == 'a' ? 1 : m = date[2] == 'n' ? 6 : 7; break;
case 'F': m = 2; break;
case 'A': m = date[2] == 'r' ? 4 : 8; break;
case 'M': m = date[2] == 'r' ? 3 : 5; break;
case 'S': m = 9; break;
case 'O': m = 10; break;
case 'N': m = 11; break;
case 'D': m = 12; break;
}
d = conv2d(date + 4);
hh = conv2d(time);
mm = conv2d(time + 3);
ss = conv2d(time + 6);
}
uint8_t DateTime::dayOfWeek() const {
uint16_t day = date2days(yOff, m, d);
return (day + 6) % 7; // Jan 1, 2000 is a Saturday, i.e. returns 6
}
uint32_t DateTime::unixtime(void) const {
uint32_t t;
uint16_t days = date2days(yOff, m, d);
t = time2long(days, hh, mm, ss);
t += SECONDS_FROM_1970_TO_2000; // seconds from 1970 to 2000
return t;
}
////////////////////////////////////////////////////////////////////////////////
// RTC_DS1340 implementation
static uint8_t bcd2bin (uint8_t val) { return val - 6 * (val >> 4); }
static uint8_t bin2bcd (uint8_t val) { return val + 6 * (val / 10); }
uint8_t RTC_DS1340::begin(void) {
return 1;
}
uint8_t RTC_DS1340::isrunning(void) {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(0);
Wire.endTransmission();
Wire.requestFrom(DS1340_ADDRESS, 1);
uint8_t ss = Wire.receive();
return !(ss>>7);
}
void RTC_DS1340::adjust(const DateTime& dt) {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(0);
Wire.send(bin2bcd(dt.second()));
Wire.send(bin2bcd(dt.minute()));
Wire.send(bin2bcd(dt.hour()));
Wire.send(bin2bcd(0));
Wire.send(bin2bcd(dt.day()));
Wire.send(bin2bcd(dt.month()));
Wire.send(bin2bcd(dt.year() - 2000));
Wire.send(0);
Wire.endTransmission();
}
DateTime RTC_DS1340::enabletricklecharger() {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(8);
Wire.send(0xA6); // No diode, 2k resistor (Don't use 250 ohm on arduino. It will burn the resistor with VCC above 3.63V)
Wire.endTransmission();
}
DateTime RTC_DS1340::disabletricklecharger() {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(8);
Wire.send(0x00); // No charge at all
Wire.endTransmission();
}
DateTime RTC_DS1340::enableFTout() {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(7);
Wire.endTransmission();
Wire.requestFrom(DS1340_ADDRESS, 1);
uint8_t setreg = Wire.receive() | 0xC0; // Read from address 7 and set OUT and FT high
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(7);
Wire.send(setreg); // Put the values back where they came from
Wire.endTransmission();
}
DateTime RTC_DS1340::disableFTout() {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(7);
Wire.endTransmission();
Wire.requestFrom(DS1340_ADDRESS, 1);
uint8_t setreg = Wire.receive() & 0xBF; // Read from address 7 and set FT low
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(7);
Wire.send(setreg); // Write the values back
Wire.endTransmission();
}
DateTime RTC_DS1340::now() {
Wire.beginTransmission(DS1340_ADDRESS);
Wire.send(0);
Wire.endTransmission();
Wire.requestFrom(DS1340_ADDRESS, 7);
uint8_t ss = bcd2bin(Wire.receive() & 0x7F);
uint8_t mm = bcd2bin(Wire.receive());
uint8_t hh = bcd2bin(Wire.receive());
Wire.receive();
uint8_t d = bcd2bin(Wire.receive());
uint8_t m = bcd2bin(Wire.receive());
uint16_t y = bcd2bin(Wire.receive()) + 2000;
return DateTime (y, m, d, hh, mm, ss);
}
////////////////////////////////////////////////////////////////////////////////
// RTC_Millis implementation
long RTC_Millis::offset = 0;
void RTC_Millis::adjust(const DateTime& dt) {
offset = dt.unixtime() - millis() / 1000;
}
DateTime RTC_Millis::now() {
return (uint32_t)(offset + millis() / 1000);
}
////////////////////////////////////////////////////////////////////////////////
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