Projects/TempDataLogger/Lib/DS1307.c

   1 /*
   2      Copyright (C) Dean Camera, 2012.
   3
   4   dean [at] fourwalledcubicle [dot] com
   5            www.lufa-lib.org
   6 */
   7
   8 #include "DS1307.h"
   9
  10 bool DS1307_SetTimeDate(const TimeDate_t* NewTimeDate)
  11 {
  12 #if defined(DUMMY_RTC)
  13         return true;
  14 #endif
  15
  16         DS1307_DateTimeRegs_t NewRegValues;
  17         const uint8_t         WriteAddress = 0;
  18
  19         // Convert new time data to the DS1307's time register layout
  20         NewRegValues.Byte1.Fields.TenSec    = (NewTimeDate->Second / 10);
  21         NewRegValues.Byte1.Fields.Sec       = (NewTimeDate->Second % 10);
  22         NewRegValues.Byte1.Fields.CH        = false;
  23         NewRegValues.Byte2.Fields.TenMin    = (NewTimeDate->Minute / 10);
  24         NewRegValues.Byte2.Fields.Min       = (NewTimeDate->Minute % 10);
  25         NewRegValues.Byte3.Fields.TenHour   = (NewTimeDate->Hour / 10);
  26         NewRegValues.Byte3.Fields.Hour      = (NewTimeDate->Hour % 10);
  27         NewRegValues.Byte3.Fields.TwelveHourMode = false;
  28
  29         // Convert new date data to the DS1307's date register layout
  30         NewRegValues.Byte4.Fields.DayOfWeek = 0;
  31         NewRegValues.Byte5.Fields.TenDay    = (NewTimeDate->Day / 10);
  32         NewRegValues.Byte5.Fields.Day       = (NewTimeDate->Day % 10);
  33         NewRegValues.Byte6.Fields.TenMonth  = (NewTimeDate->Month / 10);
  34         NewRegValues.Byte6.Fields.Month     = (NewTimeDate->Month % 10);
  35         NewRegValues.Byte7.Fields.TenYear   = (NewTimeDate->Year / 10);
  36         NewRegValues.Byte7.Fields.Year      = (NewTimeDate->Year % 10);
  37
  38         // Write the new Time and Date into the DS1307
  39         if (TWI_WritePacket(DS1307_ADDRESS, 10, &WriteAddress, sizeof(WriteAddress),
  40                            (uint8_t*)&NewRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
  41         {
  42                 return false;
  43         }
  44
  45         return true;
  46 }
  47
  48 bool DS1307_GetTimeDate(TimeDate_t* const TimeDate)
  49 {
  50 #if defined(DUMMY_RTC)
  51         TimeDate->Hour   = 1;
  52         TimeDate->Minute = 1;
  53         TimeDate->Second = 1;
  54
  55         TimeDate->Day    = 1;
  56         TimeDate->Month  = 1;
  57         TimeDate->Year   = 1;
  58
  59         return true;
  60 #endif
  61
  62         DS1307_DateTimeRegs_t CurrentRegValues;
  63         const uint8_t         ReadAddress = 0;
  64
  65         // Read in the stored Time and Date from the DS1307
  66         if (TWI_ReadPacket(DS1307_ADDRESS, 10, &ReadAddress, sizeof(ReadAddress),
  67                            (uint8_t*)&CurrentRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
  68         {
  69                 return false;
  70         }
  71
  72         // Convert stored time value into decimal
  73         TimeDate->Second  = (CurrentRegValues.Byte1.Fields.TenSec  * 10) + CurrentRegValues.Byte1.Fields.Sec;
  74         TimeDate->Minute  = (CurrentRegValues.Byte2.Fields.TenMin  * 10) + CurrentRegValues.Byte2.Fields.Min;
  75         TimeDate->Hour    = (CurrentRegValues.Byte3.Fields.TenHour * 10) + CurrentRegValues.Byte3.Fields.Hour;
  76
  77         // Convert stored date value into decimal
  78         TimeDate->Day    = (CurrentRegValues.Byte5.Fields.TenDay   * 10) + CurrentRegValues.Byte5.Fields.Day;
  79         TimeDate->Month  = (CurrentRegValues.Byte6.Fields.TenMonth * 10) + CurrentRegValues.Byte6.Fields.Month;
  80         TimeDate->Year   = (CurrentRegValues.Byte7.Fields.TenYear  * 10) + CurrentRegValues.Byte7.Fields.Year;
  81
  82         return true;
  83 }
  84