RTC.c
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/*
Copyright (C) Dean Camera, 2017.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
#include "RTC.h"
#if defined(DUMMY_RTC)
/** Current dummy RTC time and date */
static volatile TimeDate_t DummyRTC_Count;
void RTC_Init(void)
{
DummyRTC_Count.Hour = 0;
DummyRTC_Count.Minute = 0;
DummyRTC_Count.Second = 0;
DummyRTC_Count.Day = 1;
DummyRTC_Count.Month = 1;
DummyRTC_Count.Year = 00;
}
void RTC_Tick500ms(void)
{
static bool HalfSecondElapsed = false;
HalfSecondElapsed = !HalfSecondElapsed;
if (HalfSecondElapsed == false)
return;
if (++DummyRTC_Count.Second < 60)
return;
DummyRTC_Count.Second = 0;
if (++DummyRTC_Count.Minute < 60)
return;
DummyRTC_Count.Minute = 0;
if (++DummyRTC_Count.Hour < 24)
return;
DummyRTC_Count.Hour = 0;
static const char MonthLength[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
uint8_t DaysInMonth = MonthLength[DummyRTC_Count.Month - 1];
/* Check if we need to account for a leap year */
if ((DummyRTC_Count.Month == 2) &&
((!(DummyRTC_Count.Year % 400)) || ((DummyRTC_Count.Year % 100) && !(DummyRTC_Count.Year % 4))))
{
DaysInMonth++;
}
if (++DummyRTC_Count.Day <= DaysInMonth)
return;
DummyRTC_Count.Day = 1;
if (++DummyRTC_Count.Month <= 12)
return;
DummyRTC_Count.Month = 1;
DummyRTC_Count.Year++;
}
bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
{
GlobalInterruptDisable();
DummyRTC_Count = *NewTimeDate;
GlobalInterruptEnable();
return true;
}
bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
{
GlobalInterruptDisable();
*TimeDate = DummyRTC_Count;
GlobalInterruptEnable();
return true;
}
#else
void RTC_Init(void)
{
/* Unused for a real external DS1307 RTC device */
}
void RTC_Tick500ms(void)
{
/* Unused for a real external DS1307 RTC device */
}
bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
{
DS1307_DateTimeRegs_t NewRegValues;
const uint8_t WriteAddress = 0;
// Convert new time data to the DS1307's time register layout
NewRegValues.Byte1.Fields.TenSec = (NewTimeDate->Second / 10);
NewRegValues.Byte1.Fields.Sec = (NewTimeDate->Second % 10);
NewRegValues.Byte1.Fields.CH = false;
NewRegValues.Byte2.Fields.TenMin = (NewTimeDate->Minute / 10);
NewRegValues.Byte2.Fields.Min = (NewTimeDate->Minute % 10);
NewRegValues.Byte3.Fields.TenHour = (NewTimeDate->Hour / 10);
NewRegValues.Byte3.Fields.Hour = (NewTimeDate->Hour % 10);
NewRegValues.Byte3.Fields.TwelveHourMode = false;
// Convert new date data to the DS1307's date register layout
NewRegValues.Byte4.Fields.DayOfWeek = 0;
NewRegValues.Byte5.Fields.TenDay = (NewTimeDate->Day / 10);
NewRegValues.Byte5.Fields.Day = (NewTimeDate->Day % 10);
NewRegValues.Byte6.Fields.TenMonth = (NewTimeDate->Month / 10);
NewRegValues.Byte6.Fields.Month = (NewTimeDate->Month % 10);
NewRegValues.Byte7.Fields.TenYear = (NewTimeDate->Year / 10);
NewRegValues.Byte7.Fields.Year = (NewTimeDate->Year % 10);
// Write the new Time and Date into the DS1307
if (TWI_WritePacket(DS1307_ADDRESS, 10, &WriteAddress, sizeof(WriteAddress),
(uint8_t*)&NewRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
{
return false;
}
return true;
}
bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
{
DS1307_DateTimeRegs_t CurrentRegValues;
const uint8_t ReadAddress = 0;
// Read in the stored Time and Date from the DS1307
if (TWI_ReadPacket(DS1307_ADDRESS, 10, &ReadAddress, sizeof(ReadAddress),
(uint8_t*)&CurrentRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
{
return false;
}
// Convert stored time value into decimal
TimeDate->Second = (CurrentRegValues.Byte1.Fields.TenSec * 10) + CurrentRegValues.Byte1.Fields.Sec;
TimeDate->Minute = (CurrentRegValues.Byte2.Fields.TenMin * 10) + CurrentRegValues.Byte2.Fields.Min;
TimeDate->Hour = (CurrentRegValues.Byte3.Fields.TenHour * 10) + CurrentRegValues.Byte3.Fields.Hour;
// Convert stored date value into decimal
TimeDate->Day = (CurrentRegValues.Byte5.Fields.TenDay * 10) + CurrentRegValues.Byte5.Fields.Day;
TimeDate->Month = (CurrentRegValues.Byte6.Fields.TenMonth * 10) + CurrentRegValues.Byte6.Fields.Month;
TimeDate->Year = (CurrentRegValues.Byte7.Fields.TenYear * 10) + CurrentRegValues.Byte7.Fields.Year;
return true;
}
#endif