library to control, set and read time and date from Hotboards rtcc board, wich contains the Microchip MCP7941x real time clock
Dependents: Hotboards_rtcc_manual_timedate Hotboards_rtcc_timeSpan Hotboards_rtcc_alarm Hotboards_rtcc_compiler_timedate ... more
Hotboards_rtcc.cpp
- Committer:
- Hotboards
- Date:
- 2016-02-09
- Revision:
- 1:0790bcaf8b8f
- Parent:
- 0:3a2ad459941a
File content as of revision 1:0790bcaf8b8f:
/* 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 "Hotboards_rtcc.h" #define RTC_ADDR (uint8_t)(0xDE) #define EEPROM_ADDR (uint8_t)(0xAE) #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[] = { 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 += 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 = 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 ); } 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); } Hotboards_rtcc::Hotboards_rtcc( I2C &i2c ) : _i2c(i2c) { on_off = 0; } /* * enable internal oscilator if this is disable (start the clock) */ void Hotboards_rtcc::begin( void ) { if( isrunning( ) == 0 ) { writeReg( RTC_STARTADDR, 0x80 ); } } /* * set a new time and date */ void Hotboards_rtcc::adjust( const DateTime &dt ) { char buffer[8]; buffer[0] = RTC_STARTADDR; buffer[1] = bin2bcd(dt.second()) | 0x80; buffer[2] = bin2bcd(dt.minute()); buffer[3] = bin2bcd(dt.hour()); buffer[4] = bin2bcd(dt.dayOfTheWeek()) | on_off; buffer[5] = bin2bcd(dt.day()); buffer[6] = bin2bcd(dt.month()); buffer[7] = bin2bcd(dt.year() - 2000); stop(); _i2c.write( RTC_ADDR, buffer, 8 ); } /* * return an DateTime object with the actual time and date */ DateTime Hotboards_rtcc::now( void ) { char buffer[7]; buffer[0] = RTC_STARTADDR; _i2c.write(RTC_ADDR, buffer, 1, true); _i2c.read(RTC_ADDR, buffer, 7, false); uint8_t ss = bcd2bin( buffer[0] & 0x7F ); uint8_t mm = bcd2bin( buffer[1] ); uint8_t hh = bcd2bin( buffer[2] ); uint8_t dw = buffer[3] & 0x07; uint8_t d = bcd2bin( buffer[4] ); uint8_t m = bcd2bin( buffer[5] & 0xDF ); uint16_t y = bcd2bin( buffer[6] ) + 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 ) { char buffer[8]; buffer[0] = ALARM_STARTADDR; buffer[1] = bin2bcd(dt.second()) | 0x80; buffer[2] = bin2bcd(dt.minute()); buffer[3] = bin2bcd(dt.hour()); buffer[4] = bin2bcd(dt.dayOfTheWeek()) | on_off; buffer[5] = bin2bcd(dt.day()); buffer[6] = bin2bcd(dt.month()); buffer[7] = bin2bcd(dt.year() - 2000); _i2c.write( RTC_ADDR, buffer, 8 ); } 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 ) { char buffer[1]; buffer[0] = address; _i2c.write(RTC_ADDR, buffer, 1, true); _i2c.read(RTC_ADDR, buffer, 1, false); return buffer[0]; } void Hotboards_rtcc::writeReg( uint8_t address, uint8_t val ) { char buffer[2]; buffer[0] = address; buffer[1] = val; _i2c.write( RTC_ADDR, buffer, 2 ); } 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 ); }