Projects/TempDataLogger/Lib/RTC.c

   1 /*
   2      Copyright (C) Dean Camera, 2013.
   3
   4   dean [at] fourwalledcubicle [dot] com
   5            www.lufa-lib.org
   6 */
   7
   8 #include "RTC.h"
   9
  10 #if defined(DUMMY_RTC)
  11
  12 /** Current dummy RTC time and date */
  13 static volatile TimeDate_t DummyRTC_Count;
  14
  15 void RTC_Init(void)
  16 {
  17         DummyRTC_Count.Hour   = 0;
  18         DummyRTC_Count.Minute = 0;
  19         DummyRTC_Count.Second = 0;
  20         DummyRTC_Count.Day    = 1;
  21         DummyRTC_Count.Month  = 1;
  22         DummyRTC_Count.Year   = 00;
  23 }
  24
  25 void RTC_Tick500ms(void)
  26 {
  27         static bool HalfSecondElapsed = false;
  28
  29         HalfSecondElapsed = !HalfSecondElapsed;
  30         if (HalfSecondElapsed == false)
  31           return;
  32
  33         if (++DummyRTC_Count.Second < 60)
  34           return;
  35
  36         DummyRTC_Count.Second = 0;
  37
  38         if (++DummyRTC_Count.Minute < 60)
  39           return;
  40
  41         DummyRTC_Count.Minute = 0;
  42
  43         if (++DummyRTC_Count.Hour < 24)
  44           return;
  45
  46         DummyRTC_Count.Hour = 0;
  47
  48         static const char MonthLength[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  49         uint8_t DaysInMonth = MonthLength[DummyRTC_Count.Month - 1];
  50
  51         /* Check if we need to account for a leap year */
  52         if ((DummyRTC_Count.Month == 2) &&
  53             ((!(DummyRTC_Count.Year % 400)) || ((DummyRTC_Count.Year % 100) && !(DummyRTC_Count.Year % 4))))
  54         {
  55                 DaysInMonth++;
  56         }
  57
  58         if (++DummyRTC_Count.Day <= DaysInMonth)
  59           return;
  60
  61         DummyRTC_Count.Day = 1;
  62
  63         if (++DummyRTC_Count.Month <= 12)
  64           return;
  65
  66         DummyRTC_Count.Month = 1;
  67         DummyRTC_Count.Year++;
  68 }
  69
  70 bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
  71 {
  72         GlobalInterruptDisable();
  73         DummyRTC_Count = *NewTimeDate;
  74         GlobalInterruptEnable();
  75
  76         return true;
  77 }
  78
  79 bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
  80 {
  81         GlobalInterruptDisable();
  82         *TimeDate = DummyRTC_Count;
  83         GlobalInterruptEnable();
  84
  85         return true;
  86 }
  87
  88 #else
  89
  90 void RTC_Init(void)
  91 {
  92         /* Unused for a real external DS1307 RTC device */
  93 }
  94
  95 void RTC_Tick500ms(void)
  96 {
  97         /* Unused for a real external DS1307 RTC device */
  98 }
  99
 100 bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
 101 {
 102         DS1307_DateTimeRegs_t NewRegValues;
 103         const uint8_t         WriteAddress = 0;
 104
 105         // Convert new time data to the DS1307's time register layout
 106         NewRegValues.Byte1.Fields.TenSec    = (NewTimeDate->Second / 10);
 107         NewRegValues.Byte1.Fields.Sec       = (NewTimeDate->Second % 10);
 108         NewRegValues.Byte1.Fields.CH        = false;
 109         NewRegValues.Byte2.Fields.TenMin    = (NewTimeDate->Minute / 10);
 110         NewRegValues.Byte2.Fields.Min       = (NewTimeDate->Minute % 10);
 111         NewRegValues.Byte3.Fields.TenHour   = (NewTimeDate->Hour / 10);
 112         NewRegValues.Byte3.Fields.Hour      = (NewTimeDate->Hour % 10);
 113         NewRegValues.Byte3.Fields.TwelveHourMode = false;
 114
 115         // Convert new date data to the DS1307's date register layout
 116         NewRegValues.Byte4.Fields.DayOfWeek = 0;
 117         NewRegValues.Byte5.Fields.TenDay    = (NewTimeDate->Day / 10);
 118         NewRegValues.Byte5.Fields.Day       = (NewTimeDate->Day % 10);
 119         NewRegValues.Byte6.Fields.TenMonth  = (NewTimeDate->Month / 10);
 120         NewRegValues.Byte6.Fields.Month     = (NewTimeDate->Month % 10);
 121         NewRegValues.Byte7.Fields.TenYear   = (NewTimeDate->Year / 10);
 122         NewRegValues.Byte7.Fields.Year      = (NewTimeDate->Year % 10);
 123
 124         // Write the new Time and Date into the DS1307
 125         if (TWI_WritePacket(DS1307_ADDRESS, 10, &WriteAddress, sizeof(WriteAddress),
 126                            (uint8_t*)&NewRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
 127         {
 128                 return false;
 129         }
 130
 131         return true;
 132 }
 133
 134 bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
 135 {
 136         DS1307_DateTimeRegs_t CurrentRegValues;
 137         const uint8_t         ReadAddress = 0;
 138
 139         // Read in the stored Time and Date from the DS1307
 140         if (TWI_ReadPacket(DS1307_ADDRESS, 10, &ReadAddress, sizeof(ReadAddress),
 141                            (uint8_t*)&CurrentRegValues, sizeof(DS1307_DateTimeRegs_t)) != TWI_ERROR_NoError)
 142         {
 143                 return false;
 144         }
 145
 146         // Convert stored time value into decimal
 147         TimeDate->Second  = (CurrentRegValues.Byte1.Fields.TenSec  * 10) + CurrentRegValues.Byte1.Fields.Sec;
 148         TimeDate->Minute  = (CurrentRegValues.Byte2.Fields.TenMin  * 10) + CurrentRegValues.Byte2.Fields.Min;
 149         TimeDate->Hour    = (CurrentRegValues.Byte3.Fields.TenHour * 10) + CurrentRegValues.Byte3.Fields.Hour;
 150
 151         // Convert stored date value into decimal
 152         TimeDate->Day    = (CurrentRegValues.Byte5.Fields.TenDay   * 10) + CurrentRegValues.Byte5.Fields.Day;
 153         TimeDate->Month  = (CurrentRegValues.Byte6.Fields.TenMonth * 10) + CurrentRegValues.Byte6.Fields.Month;
 154         TimeDate->Year   = (CurrentRegValues.Byte7.Fields.TenYear  * 10) + CurrentRegValues.Byte7.Fields.Year;
 155
 156         return true;
 157 }
 158
 159 #endif