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_TimeRegs_t CurrentRTCTime;
  17         DS1307_DateRegs_t CurrentRTCDate;
  18
  19         // Convert new time data to the DS1307's time register layout
  20         CurrentRTCTime.Byte1.Fields.TenSec  = (NewTimeDate->Second / 10);
  21         CurrentRTCTime.Byte1.Fields.Sec     = (NewTimeDate->Second % 10);
  22         CurrentRTCTime.Byte1.Fields.CH      = false;
  23         CurrentRTCTime.Byte2.Fields.TenMin  = (NewTimeDate->Minute / 10);
  24         CurrentRTCTime.Byte2.Fields.Min     = (NewTimeDate->Minute % 10);
  25         CurrentRTCTime.Byte3.Fields.TenHour = (NewTimeDate->Hour / 10);
  26         CurrentRTCTime.Byte3.Fields.Hour    = (NewTimeDate->Hour % 10);
  27         CurrentRTCTime.Byte3.Fields.TwelveHourMode = false;
  28
  29         // Convert new date data to the DS1307's date register layout
  30         CurrentRTCDate.Byte1.Fields.TenDay   = (NewTimeDate->Day / 10);
  31         CurrentRTCDate.Byte1.Fields.Day      = (NewTimeDate->Day % 10);
  32         CurrentRTCDate.Byte2.Fields.TenMonth = (NewTimeDate->Month / 10);
  33         CurrentRTCDate.Byte2.Fields.Month    = (NewTimeDate->Month % 10);
  34         CurrentRTCDate.Byte3.Fields.TenYear  = (NewTimeDate->Year / 10);
  35         CurrentRTCDate.Byte3.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(CurrentRTCTime.Byte1.IntVal);
  44                 TWI_SendByte(CurrentRTCTime.Byte2.IntVal);
  45                 TWI_SendByte(CurrentRTCTime.Byte3.IntVal);
  46
  47                 // Write date data to the second set of device registers
  48                 TWI_SendByte(CurrentRTCDate.Byte1.IntVal);
  49                 TWI_SendByte(CurrentRTCDate.Byte2.IntVal);
  50                 TWI_SendByte(CurrentRTCDate.Byte3.IntVal);
  51
  52                 TWI_StopTransmission();
  53         }
  54 }
  55
  56 void DS1307_GetTimeDate(TimeDate_t* const TimeDate)
  57 {
  58 #if defined(DUMMY_RTC)
  59         TimeDate->Hour   = 1;
  60         TimeDate->Minute = 1;
  61         TimeDate->Second = 1;
  62
  63         TimeDate->Day    = 1;
  64         TimeDate->Month  = 1;
  65         TimeDate->Year   = 1;
  66
  67         return;
  68 #endif
  69
  70         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  71         {
  72                 // Must start reading from the first address within the device
  73                 TWI_SendByte(0);
  74                 TWI_StopTransmission();
  75         }
  76
  77         DS1307_TimeRegs_t CurrentRTCTime;
  78         DS1307_DateRegs_t CurrentRTCDate;
  79
  80         if (TWI_StartTransmission(DS1307_ADDRESS_READ, 10))
  81         {
  82                 // First set of registers store the current time
  83                 TWI_ReceiveByte(&CurrentRTCTime.Byte1.IntVal, false);
  84                 TWI_ReceiveByte(&CurrentRTCTime.Byte2.IntVal, false);
  85                 TWI_ReceiveByte(&CurrentRTCTime.Byte3.IntVal, false);
  86
  87                 // Second set of registers store the current date
  88                 TWI_ReceiveByte(&CurrentRTCDate.Byte1.IntVal, false);
  89                 TWI_ReceiveByte(&CurrentRTCDate.Byte2.IntVal, false);
  90                 TWI_ReceiveByte(&CurrentRTCDate.Byte3.IntVal, true);
  91
  92                 TWI_StopTransmission();
  93         }
  94
  95         // Convert stored time value into decimal
  96         TimeDate->Second  = (CurrentRTCTime.Byte1.Fields.TenSec  * 10) + CurrentRTCTime.Byte1.Fields.Sec;
  97         TimeDate->Minute  = (CurrentRTCTime.Byte2.Fields.TenMin  * 10) + CurrentRTCTime.Byte2.Fields.Min;
  98         TimeDate->Hour    = (CurrentRTCTime.Byte3.Fields.TenHour * 10) + CurrentRTCTime.Byte3.Fields.Hour;
  99
 100         // Convert stored date value into decimal
 101         TimeDate->Day    = (CurrentRTCDate.Byte1.Fields.TenDay   * 10) + CurrentRTCDate.Byte1.Fields.Day;
 102         TimeDate->Month  = (CurrentRTCDate.Byte2.Fields.TenMonth * 10) + CurrentRTCDate.Byte2.Fields.Month;
 103         TimeDate->Year   = (CurrentRTCDate.Byte3.Fields.TenYear  * 10) + CurrentRTCDate.Byte3.Fields.Year;
 104 }
 105