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Hotboards_rtcc.cpp
399 lines (342 loc) · 9.5 KB
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Hotboards_rtcc.cpp
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/*
Hotboards_rtcc.cpp - Library to read, write and control the real time clock MCP7941x included in rtc board.
http://hotboards.org
adapted and taken from https://github.com/adafruit/RTClib
Released into the public domain.
*/
#include <Wire.h>
#include "Hotboards_rtcc.h"
#ifdef __AVR__
#include <avr/pgmspace.h>
#elif defined(ESP8266)
#include <pgmspace.h>
#elif defined(ARDUINO_ARCH_SAMD)
// nothing special needed
#elif defined(ARDUINO_SAM_DUE)
#define PROGMEM
#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
#define Wire Wire1
#endif
#define RTC_ADDR (uint8_t)(0xDE >> 1)
#define EEPROM_ADDR (uint8_t)(0xAE >> 1)
#define RTC_STARTADDR (uint8_t)0x00
#define ALARM_STARTADDR (uint8_t)0x0A
#define CTRL_STARTADDR (uint8_t)0x07
#define SRAM_SARTADDR (uint8_t)0x20
#define EEPROM_SARTADDR (uint8_t)0x00
#define PEEPROM_SARTADDR (uint8_t)0xF0
#define SECONDS_FROM_1970_TO_2000 946684800
const 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;
}
static uint8_t conv2d(const char* p)
{
uint8_t v = 0;
if ('0' <= *p && *p <= '9')
v = *p - '0';
return 10 * v + *++p - '0';
}
/*
* Constructor that use time in a 32 bit variable
*/
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;
}
/*
* Constructor that use time variables for each element in decimal
*/
DateTime::DateTime( uint16_t year, uint8_t month, uint8_t day,
uint8_t hour, uint8_t min, uint8_t sec, uint8_t dweek )
{
if( year >= 2000 )
{
year -= 2000;
}
yOff = year;
m = month;
d = day;
hh = hour;
mm = min;
ss = sec;
dw = dweek;
}
/*
* Constructor tcreate a copy of DateTime object
*/
DateTime::DateTime (const DateTime& copy):
yOff(copy.yOff),
m(copy.m),
d(copy.d),
hh(copy.hh),
mm(copy.mm),
ss(copy.ss)
{}
/*
* A convenient constructor for using "the compiler's time":
DateTime now (__DATE__, __TIME__);
*/
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 );
}
/*
* A convenient constructor for using "the compiler's time":
* This version will save RAM by using PROGMEM to store it by using the F macro.
* DateTime now (F(__DATE__), F(__TIME__));
*/
DateTime::DateTime( const __FlashStringHelper* date, const __FlashStringHelper* time )
{
// sample input: date = "Dec 26 2009", time = "12:34:56"
char buff[11];
memcpy_P(buff, date, 11);
yOff = conv2d(buff + 9);
// Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
switch( buff[0] )
{
case 'J': m = buff[1] == 'a' ? 1 : m = buff[2] == 'n' ? 6 : 7; break;
case 'F': m = 2; break;
case 'A': m = buff[2] == 'r' ? 4 : 8; break;
case 'M': m = buff[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(buff + 4);
memcpy_P(buff, time, 8);
hh = conv2d(buff);
mm = conv2d(buff + 3);
ss = conv2d(buff + 6);
}
uint8_t DateTime::dayOfTheWeek( void ) 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;
}
uint32_t DateTime::secondstime( void ) const
{
uint32_t t;
uint16_t days = date2days( yOff, m, d );
t = time2long( days, hh, mm, ss );
return t;
}
DateTime DateTime::operator+(const TimeSpan& span)
{
return DateTime(unixtime()+span.totalseconds());
}
DateTime DateTime::operator-(const TimeSpan& span)
{
return DateTime(unixtime()-span.totalseconds());
}
TimeSpan DateTime::operator-(const DateTime& right)
{
return TimeSpan(unixtime()-right.unixtime());
}
TimeSpan::TimeSpan (int32_t seconds):
_seconds(seconds)
{}
TimeSpan::TimeSpan (int16_t days, int8_t hours, int8_t minutes, int8_t seconds):
_seconds((int32_t)days*86400L + (int32_t)hours*3600 + (int32_t)minutes*60 + seconds)
{}
TimeSpan::TimeSpan (const TimeSpan& copy):
_seconds(copy._seconds)
{}
TimeSpan TimeSpan::operator+(const TimeSpan& right)
{
return TimeSpan(_seconds+right._seconds);
}
TimeSpan TimeSpan::operator-(const TimeSpan& right)
{
return TimeSpan(_seconds-right._seconds);
}
/*
* enable internal oscilator if this is disable (start the clock)
*/
uint8_t Hotboards_rtcc::begin( void )
{
if( isrunning( ) == 0 )
{
writeReg( RTC_STARTADDR, 0x80 );
}
}
/*
* set a new time and date
*/
void Hotboards_rtcc::adjust( const DateTime &dt )
{
stop();
Wire.beginTransmission( RTC_ADDR );
Wire.write( RTC_STARTADDR ); // start at location 0
Wire.write( bin2bcd( dt.second( ) ) | 0x80 );
Wire.write( bin2bcd( dt.minute( ) ) );
Wire.write( bin2bcd( dt.hour( ) ) );
Wire.write( dt.dayOfTheWeek( ) | on_off ); // day of the week
Wire.write( bin2bcd( dt.day( ) ) );
Wire.write( bin2bcd( dt.month( ) ) );
Wire.write( bin2bcd( dt.year( ) - 2000 ) );
Wire.endTransmission( );
}
/*
* return an DateTime object with the actual time and date
*/
DateTime Hotboards_rtcc::now( void )
{
Wire.beginTransmission( RTC_ADDR );
Wire.write( RTC_STARTADDR ); // start at location 0
Wire.endTransmission( );
Wire.requestFrom( RTC_ADDR, (uint8_t)7 );
uint8_t ss = bcd2bin( Wire.read( ) & 0x7F );
uint8_t mm = bcd2bin( Wire.read( ) );
uint8_t hh = bcd2bin( Wire.read( ) );
uint8_t dw = Wire.read( ) & 0x07;
uint8_t d = bcd2bin( Wire.read( ) );
uint8_t m = bcd2bin( Wire.read( ) & 0xDF );
uint16_t y = bcd2bin( Wire.read( ) ) + 2000;
return DateTime( y, m, d, hh, mm, ss, dw );
}
/*
* return a true if the rtcc is running
*/
uint8_t Hotboards_rtcc::isrunning( void )
{
uint8_t running = readReg( RTC_STARTADDR + 3 ) & 0x20;
return running >> 5;
}
/*
* stop the internal rtcc clock
*/
void Hotboards_rtcc::stop( void )
{
writeReg( RTC_STARTADDR, 0x00 );
while( isrunning( ) == 1 );
}
void Hotboards_rtcc::setVBAT( uint8_t OnOff )
{
on_off = ( OnOff & 0x01 ) << 3;
}
void Hotboards_rtcc::setAlarm( const DateTime &dt, uint8_t alarm )
{
Wire.beginTransmission( RTC_ADDR );
Wire.write( ALARM_STARTADDR );
Wire.write( bin2bcd( dt.second( ) ) );
Wire.write( bin2bcd( dt.minute( ) ) );
Wire.write( bin2bcd( dt.hour( ) ) );
Wire.write( dt.dayOfTheWeek( ) | 0x70 );
Wire.write( bin2bcd( dt.day( ) ) );
Wire.write( bin2bcd( dt.month( ) ) );
Wire.write( bin2bcd( dt.year( ) - 2000 ) );
Wire.endTransmission( );
}
uint8_t Hotboards_rtcc::getAlarmStatus( uint8_t alarm )
{
uint8_t status = readReg( ALARM_STARTADDR + 3 );
return ( status >> 3 ) & 0x01;
}
void Hotboards_rtcc::clearAlarm( uint8_t alarm )
{
uint8_t status = readReg( ALARM_STARTADDR + 3 );
writeReg( ALARM_STARTADDR + 3, (status & 0xF7) );
}
void Hotboards_rtcc::turnOnAlarm( uint8_t alarm )
{
uint8_t ctrl = readReg( CTRL_STARTADDR );
writeReg( CTRL_STARTADDR, ctrl | 0x10 );
}
void Hotboards_rtcc::turnOffAlarm( uint8_t alarm )
{
uint8_t ctrl = readReg( CTRL_STARTADDR );
writeReg( CTRL_STARTADDR, ctrl & 0xEF );
}
uint8_t Hotboards_rtcc::readReg( uint8_t address )
{
Wire.beginTransmission( RTC_ADDR );
Wire.write( address ); // start at location 0
Wire.endTransmission( );
Wire.requestFrom( RTC_ADDR, (uint8_t)1 );
return Wire.read( );
}
void Hotboards_rtcc::writeReg( uint8_t address, uint8_t val )
{
Wire.beginTransmission( RTC_ADDR );
Wire.write( address );
Wire.write( val );
Wire.endTransmission( );
}
uint8_t Hotboards_rtcc::bcd2bin( uint8_t val )
{
return val - 6 * ( val >> 4 );
}
uint8_t Hotboards_rtcc::bin2bcd( uint8_t val )
{
return val + 6 * ( val / 10 );
}