Projects/TemperatureDataLogger/Lib/DS1307.c

   1 /*
   2      Copyright (C) Dean Camera, 2010.
   3
   4   dean [at] fourwalledcubicle [dot] com
   5       www.fourwalledcubicle.com
   6 */
   7
   8 #include "DS1307.h"
   9
  10 void DS1307_SetDate(uint8_t Day, uint8_t Month, uint8_t Year)
  11 {
  12 #if defined(DUMMY_RTC)
  13         return;
  14 #endif
  15
  16         DS1307_DateRegs_t CurrentRTCDate;
  17         CurrentRTCDate.Byte1.TenDay   = (Day / 10);
  18         CurrentRTCDate.Byte1.Day      = (Day % 10);
  19         CurrentRTCDate.Byte2.TenMonth = (Month / 10);
  20         CurrentRTCDate.Byte2.Month    = (Month % 10);
  21         CurrentRTCDate.Byte3.TenYear  = (Year / 10);
  22         CurrentRTCDate.Byte3.Year     = (Year % 10);
  23
  24         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  25         {
  26                 TWI_SendByte(DS1307_DATEREG_START);
  27                 TWI_SendByte(CurrentRTCDate.Byte1.IntVal);
  28                 TWI_SendByte(CurrentRTCDate.Byte2.IntVal);
  29                 TWI_SendByte(CurrentRTCDate.Byte3.IntVal);
  30
  31                 TWI_StopTransmission();
  32         }
  33 }
  34
  35 void DS1307_SetTime(uint8_t Hour, uint8_t Minute, uint8_t Second)
  36 {
  37 #if defined(DUMMY_RTC)
  38         return;
  39 #endif
  40
  41         DS1307_TimeRegs_t CurrentRTCTime;
  42         CurrentRTCTime.Byte1.TenSec  = (Second / 10);
  43         CurrentRTCTime.Byte1.Sec     = (Second % 10);
  44         CurrentRTCTime.Byte1.CH      = false;
  45         CurrentRTCTime.Byte2.TenMin  = (Minute / 10);
  46         CurrentRTCTime.Byte2.Min     = (Minute % 10);
  47         CurrentRTCTime.Byte3.TenHour = (Hour / 10);
  48         CurrentRTCTime.Byte3.Hour    = (Hour % 10);
  49         CurrentRTCTime.Byte3.TwelveHourMode = false;
  50
  51         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  52         {
  53                 TWI_SendByte(DS1307_TIMEREG_START);
  54                 TWI_SendByte(CurrentRTCTime.Byte1.IntVal);
  55                 TWI_SendByte(CurrentRTCTime.Byte2.IntVal);
  56                 TWI_SendByte(CurrentRTCTime.Byte3.IntVal);
  57
  58                 TWI_StopTransmission();
  59         }
  60 }
  61
  62 void DS1307_GetDate(uint8_t* Day, uint8_t* Month, uint8_t* Year)
  63 {
  64 #if defined(DUMMY_RTC)
  65         *Day   = 1;
  66         *Month = 1;
  67         *Year  = 1;
  68         return;
  69 #endif
  70
  71         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  72         {
  73                 TWI_SendByte(DS1307_DATEREG_START);
  74
  75                 TWI_StopTransmission();
  76         }
  77
  78         DS1307_DateRegs_t CurrentRTCDate;
  79
  80         if (TWI_StartTransmission(DS1307_ADDRESS_READ))
  81         {
  82                 TWI_ReceiveByte(&CurrentRTCDate.Byte1.IntVal, false);
  83                 TWI_ReceiveByte(&CurrentRTCDate.Byte2.IntVal, false);
  84                 TWI_ReceiveByte(&CurrentRTCDate.Byte3.IntVal, true);
  85
  86                 TWI_StopTransmission();
  87         }
  88
  89         *Day    = (CurrentRTCDate.Byte1.TenDay   * 10) + CurrentRTCDate.Byte1.Day;
  90         *Month  = (CurrentRTCDate.Byte2.TenMonth * 10) + CurrentRTCDate.Byte2.Month;
  91         *Year   = (CurrentRTCDate.Byte3.TenYear  * 10) + CurrentRTCDate.Byte3.Year;
  92 }
  93
  94 void DS1307_GetTime(uint8_t* Hour, uint8_t* Minute, uint8_t* Second)
  95 {
  96 #if defined(DUMMY_RTC)
  97         *Hour   = 1;
  98         *Minute = 1;
  99         *Second = 1;
 100         return;
 101 #endif
 102
 103         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
 104         {
 105                 TWI_SendByte(DS1307_TIMEREG_START);
 106
 107                 TWI_StopTransmission();
 108         }
 109
 110         DS1307_TimeRegs_t CurrentRTCTime;
 111
 112         if (TWI_StartTransmission(DS1307_ADDRESS_READ))
 113         {
 114                 TWI_ReceiveByte(&CurrentRTCTime.Byte1.IntVal, false);
 115                 TWI_ReceiveByte(&CurrentRTCTime.Byte2.IntVal, false);
 116                 TWI_ReceiveByte(&CurrentRTCTime.Byte3.IntVal, true);
 117
 118                 TWI_StopTransmission();
 119         }
 120
 121         *Second  = (CurrentRTCTime.Byte1.TenSec  * 10) + CurrentRTCTime.Byte1.Sec;
 122         *Minute  = (CurrentRTCTime.Byte2.TenMin  * 10) + CurrentRTCTime.Byte2.Min;
 123         *Hour    = (CurrentRTCTime.Byte3.TenHour * 10) + CurrentRTCTime.Byte3.Hour;
 124 }