qmk_firmware/Projects/TempDataLogger/Lib/DS1307.c

/*
     Copyright (C) Dean Camera, 2013.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

#include "DS1307.h"

bool DS1307_SetTimeDate(const TimeDate_t* NewTimeDate)
{
#if !defined(DUMMY_RTC)
	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;
	}
#endif

	return true;
}

bool DS1307_GetTimeDate(TimeDate_t* const TimeDate)
{
#if defined(DUMMY_RTC)
	TimeDate->Hour   = 1;
	TimeDate->Minute = 1;
	TimeDate->Second = 1;

	TimeDate->Day    = 1;
	TimeDate->Month  = 1;
	TimeDate->Year   = 1;
#else
	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;
#endif

	return true;
}