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RTC.cpp
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RTC.cpp
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#include <Arduino.h>
#include "SoftwareI2C.h"
#include "Pins.h"
#include "RTC.h"
// real time clock
RTC rtc;
// we can't use Wire because A4 (SDA) resets the LCD
SoftwareI2C softWire;
#define RTC_I2C_ADDRESS 0x68
RTC::RTC():
m_Hour24(0),
m_Minute(0),
m_Second(0),
m_DayOfWeek(1),
m_DayOfMonth(1),
m_Month(1),
m_Year(12)
{
}
void RTC::Setup(void)
{
softWire.begin(PIN_SDA, PIN_SCL);
ReadTime(true);
}
byte RTC::BCD2Dec(byte BCD)
{
return (BCD/16*10) + (BCD & 0x0F);
}
byte RTC::Dec2BCD(byte Dec)
{
return (Dec/10*16) + (Dec % 10);
}
void RTC::ReadTime(bool Full)
{
if (Full)
{
// from register 0
softWire.beginTransmission(RTC_I2C_ADDRESS);
softWire.write((byte)0x00);
softWire.endTransmission();
softWire.requestFrom(RTC_I2C_ADDRESS, 7);
m_Second = BCD2Dec(softWire.read() & 0x7F); // high bit is CH (Clock Halt)
}
else
{
// just the minutes and hours
// from register 1
softWire.beginTransmission(RTC_I2C_ADDRESS);
softWire.write((byte)0x01);
softWire.endTransmission();
softWire.requestFrom(RTC_I2C_ADDRESS, 2);
}
m_Minute = BCD2Dec(softWire.read());
byte Register2 = softWire.read();
if (Register2 & 0x40) // 12/24 hr
{
// 12 hr mode, bit 6=PM
m_Hour24 = BCD2Dec(Register2 & 0x3F);
if (Register2 & 0x20)
{
m_Hour24 += 12;
if (m_Hour24 > 23) m_Hour24 = 0;
}
}
else
{
// 24 hour mode
m_Hour24 = BCD2Dec(Register2 & 0x3F);
}
if (Full)
{
m_DayOfWeek = BCD2Dec(softWire.read());
m_DayOfMonth = BCD2Dec(softWire.read());
m_Month = BCD2Dec(softWire.read());
m_Year = BCD2Dec(softWire.read());
}
}
byte RTC::ReadSecond(void)
{
// from register 01
softWire.beginTransmission(RTC_I2C_ADDRESS);
softWire.write(0x00);
softWire.endTransmission();
softWire.requestFrom(RTC_I2C_ADDRESS, 1);
m_Second = BCD2Dec(softWire.read());
return m_Second;
}
byte RTC::ReadMinute(void)
{
// from register 01
softWire.beginTransmission(RTC_I2C_ADDRESS);
softWire.write(0x01);
softWire.endTransmission();
softWire.requestFrom(RTC_I2C_ADDRESS, 1);
return BCD2Dec(softWire.read());
}
void RTC::WriteTime(void)
{
softWire.beginTransmission(RTC_I2C_ADDRESS);
softWire.write((byte)0x00);
softWire.write(Dec2BCD(m_Second));
softWire.write(Dec2BCD(m_Minute));
softWire.write(Dec2BCD(m_Hour24)); // 24 hr mode
softWire.write(Dec2BCD(m_DayOfWeek));
softWire.write(Dec2BCD(m_DayOfMonth));
softWire.write(Dec2BCD(m_Month));
softWire.write(Dec2BCD(m_Year));
softWire.endTransmission();
}
bool RTC::CheckPeriod(unsigned long& Timer, unsigned long PeriodMS)
{
// has the timer interval gone off?
unsigned long Now = millis();
if (Now - Timer > PeriodMS)
{
Timer = Now;
return true;
}
return false;
}