Projects/TempDataLogger/Lib/DS1307.c

   1 /*
   2      Copyright (C) Dean Camera, 2010.
   3
   4   dean [at] fourwalledcubicle [dot] com
   5            www.lufa-lib.org
   6 */
   7
   8 #include "DS1307.h"
   9
  10 void DS1307_SetDate(const uint8_t Day,
  11                     const uint8_t Month,
  12                     const uint8_t Year)
  13 {
  14 #if defined(DUMMY_RTC)
  15         return;
  16 #endif
  17
  18         DS1307_DateRegs_t CurrentRTCDate;
  19         CurrentRTCDate.Byte1.Fields.TenDay   = (Day / 10);
  20         CurrentRTCDate.Byte1.Fields.Day      = (Day % 10);
  21         CurrentRTCDate.Byte2.Fields.TenMonth = (Month / 10);
  22         CurrentRTCDate.Byte2.Fields.Month    = (Month % 10);
  23         CurrentRTCDate.Byte3.Fields.TenYear  = (Year / 10);
  24         CurrentRTCDate.Byte3.Fields.Year     = (Year % 10);
  25
  26         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  27         {
  28                 TWI_SendByte(DS1307_DATEREG_START);
  29                 TWI_SendByte(CurrentRTCDate.Byte1.IntVal);
  30                 TWI_SendByte(CurrentRTCDate.Byte2.IntVal);
  31                 TWI_SendByte(CurrentRTCDate.Byte3.IntVal);
  32
  33                 TWI_StopTransmission();
  34         }
  35 }
  36
  37 void DS1307_SetTime(const uint8_t Hour,
  38                     const uint8_t Minute,
  39                     const uint8_t Second)
  40 {
  41 #if defined(DUMMY_RTC)
  42         return;
  43 #endif
  44
  45         DS1307_TimeRegs_t CurrentRTCTime;
  46         CurrentRTCTime.Byte1.Fields.TenSec  = (Second / 10);
  47         CurrentRTCTime.Byte1.Fields.Sec     = (Second % 10);
  48         CurrentRTCTime.Byte1.Fields.CH      = false;
  49         CurrentRTCTime.Byte2.Fields.TenMin  = (Minute / 10);
  50         CurrentRTCTime.Byte2.Fields.Min     = (Minute % 10);
  51         CurrentRTCTime.Byte3.Fields.TenHour = (Hour / 10);
  52         CurrentRTCTime.Byte3.Fields.Hour    = (Hour % 10);
  53         CurrentRTCTime.Byte3.Fields.TwelveHourMode = false;
  54
  55         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  56         {
  57                 TWI_SendByte(DS1307_TIMEREG_START);
  58                 TWI_SendByte(CurrentRTCTime.Byte1.IntVal);
  59                 TWI_SendByte(CurrentRTCTime.Byte2.IntVal);
  60                 TWI_SendByte(CurrentRTCTime.Byte3.IntVal);
  61
  62                 TWI_StopTransmission();
  63         }
  64 }
  65
  66 void DS1307_GetDate(uint8_t* const Day,
  67                     uint8_t* const Month,
  68                     uint8_t* const Year)
  69 {
  70 #if defined(DUMMY_RTC)
  71         *Day   = 1;
  72         *Month = 1;
  73         *Year  = 1;
  74         return;
  75 #endif
  76
  77         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
  78         {
  79                 TWI_SendByte(DS1307_DATEREG_START);
  80
  81                 TWI_StopTransmission();
  82         }
  83
  84         DS1307_DateRegs_t CurrentRTCDate;
  85
  86         if (TWI_StartTransmission(DS1307_ADDRESS_READ, 10))
  87         {
  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         *Day    = (CurrentRTCDate.Byte1.Fields.TenDay   * 10) + CurrentRTCDate.Byte1.Fields.Day;
  96         *Month  = (CurrentRTCDate.Byte2.Fields.TenMonth * 10) + CurrentRTCDate.Byte2.Fields.Month;
  97         *Year   = (CurrentRTCDate.Byte3.Fields.TenYear  * 10) + CurrentRTCDate.Byte3.Fields.Year;
  98 }
  99
 100 void DS1307_GetTime(uint8_t* const Hour,
 101                     uint8_t* const Minute,
 102                     uint8_t* const Second)
 103 {
 104 #if defined(DUMMY_RTC)
 105         *Hour   = 1;
 106         *Minute = 1;
 107         *Second = 1;
 108         return;
 109 #endif
 110
 111         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE, 10))
 112         {
 113                 TWI_SendByte(DS1307_TIMEREG_START);
 114
 115                 TWI_StopTransmission();
 116         }
 117
 118         DS1307_TimeRegs_t CurrentRTCTime;
 119
 120         if (TWI_StartTransmission(DS1307_ADDRESS_READ, 10))
 121         {
 122                 TWI_ReceiveByte(&CurrentRTCTime.Byte1.IntVal, false);
 123                 TWI_ReceiveByte(&CurrentRTCTime.Byte2.IntVal, false);
 124                 TWI_ReceiveByte(&CurrentRTCTime.Byte3.IntVal, true);
 125
 126                 TWI_StopTransmission();
 127         }
 128
 129         *Second  = (CurrentRTCTime.Byte1.Fields.TenSec  * 10) + CurrentRTCTime.Byte1.Fields.Sec;
 130         *Minute  = (CurrentRTCTime.Byte2.Fields.TenMin  * 10) + CurrentRTCTime.Byte2.Fields.Min;
 131         *Hour    = (CurrentRTCTime.Byte3.Fields.TenHour * 10) + CurrentRTCTime.Byte3.Fields.Hour;
 132 }
 133