Projects/TempDataLogger/Lib/DS1307.c

   1 /*
   2      Copyright (C) Dean Camera, 2011.
   3
   4   dean [at] fourwalledcubicle [dot] com
   5            www.lufa-lib.org
   6 */
   7
   8 #include "DS1307.h"
   9
  10 void DS1307_SetTimeDate(const TimeDate_t* NewTimeDate)
  11 {
  12 #if defined(DUMMY_RTC)
  13         return;
  14 #endif
  15
  16         DS1307_DateTimeRegs_t NewRegValues;
  17
  18         // Convert new time data to the DS1307's time register layout
  19         NewRegValues.Byte1.Fields.TenSec    = (NewTimeDate->Second / 10);
  20         NewRegValues.Byte1.Fields.Sec       = (NewTimeDate->Second % 10);
  21         NewRegValues.Byte1.Fields.CH        = false;
  22         NewRegValues.Byte2.Fields.TenMin    = (NewTimeDate->Minute / 10);
  23         NewRegValues.Byte2.Fields.Min       = (NewTimeDate->Minute % 10);
  24         NewRegValues.Byte3.Fields.TenHour   = (NewTimeDate->Hour / 10);
  25         NewRegValues.Byte3.Fields.Hour      = (NewTimeDate->Hour % 10);
  26         NewRegValues.Byte3.Fields.TwelveHourMode = false;
  27
  28         // Convert new date data to the DS1307's date register layout
  29         NewRegValues.Byte4.Fields.DayOfWeek = 0;
  30         NewRegValues.Byte5.Fields.TenDay    = (NewTimeDate->Day / 10);
  31         NewRegValues.Byte5.Fields.Day       = (NewTimeDate->Day % 10);
  32         NewRegValues.Byte6.Fields.TenMonth  = (NewTimeDate->Month / 10);
  33         NewRegValues.Byte6.Fields.Month     = (NewTimeDate->Month % 10);
  34         NewRegValues.Byte7.Fields.TenYear   = (NewTimeDate->Year / 10);
  35         NewRegValues.Byte7.Fields.Year      = (NewTimeDate->Year % 10);
  36
  37         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  38         {
  39                 // Must start writing to the first address within the device
  40                 TWI_SendByte(0);
  41
  42                 // Write time data to the first set of device registers
  43                 TWI_SendByte(NewRegValues.Byte1.IntVal);
  44                 TWI_SendByte(NewRegValues.Byte2.IntVal);
  45                 TWI_SendByte(NewRegValues.Byte3.IntVal);
  46
  47                 // Write date data to the second set of device registers
  48                 TWI_SendByte(NewRegValues.Byte4.IntVal);
  49                 TWI_SendByte(NewRegValues.Byte5.IntVal);
  50                 TWI_SendByte(NewRegValues.Byte6.IntVal);
  51                 TWI_SendByte(NewRegValues.Byte7.IntVal);
  52
  53                 TWI_StopTransmission();
  54         }
  55 }
  56
  57 void DS1307_GetTimeDate(TimeDate_t* const TimeDate)
  58 {
  59 #if defined(DUMMY_RTC)
  60         TimeDate->Hour   = 1;
  61         TimeDate->Minute = 1;
  62         TimeDate->Second = 1;
  63
  64         TimeDate->Day    = 1;
  65         TimeDate->Month  = 1;
  66         TimeDate->Year   = 1;
  67
  68         return;
  69 #endif
  70
  71         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  72         {
  73                 // Must start reading from the first address within the device
  74                 TWI_SendByte(0);
  75                 TWI_StopTransmission();
  76         }
  77
  78         DS1307_DateTimeRegs_t CurrentRegValues;
  79
  80         if (TWI_StartTransmission(DS1307_ADDRESS_READ, 10))
  81         {
  82                 // First set of registers store the current time
  83                 TWI_ReceiveByte(&CurrentRegValues.Byte1.IntVal, false);
  84                 TWI_ReceiveByte(&CurrentRegValues.Byte2.IntVal, false);
  85                 TWI_ReceiveByte(&CurrentRegValues.Byte3.IntVal, false);
  86
  87                 // Second set of registers store the current date
  88                 TWI_ReceiveByte(&CurrentRegValues.Byte4.IntVal, false);
  89                 TWI_ReceiveByte(&CurrentRegValues.Byte5.IntVal, false);
  90                 TWI_ReceiveByte(&CurrentRegValues.Byte6.IntVal, false);
  91                 TWI_ReceiveByte(&CurrentRegValues.Byte7.IntVal, true);
  92
  93                 TWI_StopTransmission();
  94         }
  95
  96         // Convert stored time value into decimal
  97         TimeDate->Second  = (CurrentRegValues.Byte1.Fields.TenSec  * 10) + CurrentRegValues.Byte1.Fields.Sec;
  98         TimeDate->Minute  = (CurrentRegValues.Byte2.Fields.TenMin  * 10) + CurrentRegValues.Byte2.Fields.Min;
  99         TimeDate->Hour    = (CurrentRegValues.Byte3.Fields.TenHour * 10) + CurrentRegValues.Byte3.Fields.Hour;
 100
 101         // Convert stored date value into decimal
 102         TimeDate->Day    = (CurrentRegValues.Byte5.Fields.TenDay   * 10) + CurrentRegValues.Byte5.Fields.Day;
 103         TimeDate->Month  = (CurrentRegValues.Byte6.Fields.TenMonth * 10) + CurrentRegValues.Byte6.Fields.Month;
 104         TimeDate->Year   = (CurrentRegValues.Byte7.Fields.TenYear  * 10) + CurrentRegValues.Byte7.Fields.Year;
 105 }
 106