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_Init(void)
  11 {
  12         // Nothing to initialize
  13 }
  14
  15 void DS1307_SetDate(uint8_t Day, uint8_t Month, uint8_t Year)
  16 {
  17 #if defined(DUMMY_RTC)
  18         return;
  19 #endif
  20
  21         DS1307_DateRegs_t CurrentRTCDate;
  22         CurrentRTCDate.Byte1.TenDay   = (Day / 10);
  23         CurrentRTCDate.Byte1.Day      = (Day % 10);
  24         CurrentRTCDate.Byte2.TenMonth = (Month / 10);
  25         CurrentRTCDate.Byte2.Month    = (Month % 10);
  26         CurrentRTCDate.Byte3.TenYear  = (Year / 10);
  27         CurrentRTCDate.Byte3.Year     = (Year % 10);
  28
  29         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  30         {
  31                 TWI_SendByte(DS1307_DATEREG_START);
  32                 TWI_SendByte(CurrentRTCDate.Byte1.IntVal);
  33                 TWI_SendByte(CurrentRTCDate.Byte2.IntVal);
  34                 TWI_SendByte(CurrentRTCDate.Byte3.IntVal);
  35
  36                 TWI_StopTransmission();
  37         }
  38 }
  39
  40 void DS1307_SetTime(uint8_t Hour, uint8_t Minute, uint8_t Second)
  41 {
  42 #if defined(DUMMY_RTC)
  43         return;
  44 #endif
  45
  46         DS1307_TimeRegs_t CurrentRTCTime;
  47         CurrentRTCTime.Byte1.TenSec  = (Second / 10);
  48         CurrentRTCTime.Byte1.Sec     = (Second % 10);
  49         CurrentRTCTime.Byte1.CH      = false;
  50         CurrentRTCTime.Byte2.TenMin  = (Minute / 10);
  51         CurrentRTCTime.Byte2.Min     = (Minute % 10);
  52         CurrentRTCTime.Byte3.TenHour = (Hour / 10);
  53         CurrentRTCTime.Byte3.Hour    = (Hour % 10);
  54         CurrentRTCTime.Byte3.TwelveHourMode = false;
  55
  56         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  57         {
  58                 TWI_SendByte(DS1307_TIMEREG_START);
  59                 TWI_SendByte(CurrentRTCTime.Byte1.IntVal);
  60                 TWI_SendByte(CurrentRTCTime.Byte2.IntVal);
  61                 TWI_SendByte(CurrentRTCTime.Byte3.IntVal);
  62
  63                 TWI_StopTransmission();
  64         }
  65 }
  66
  67 void DS1307_GetDate(uint8_t* Day, uint8_t* Month, uint8_t* Year)
  68 {
  69 #if defined(DUMMY_RTC)
  70         *Day   = 1;
  71         *Month = 1;
  72         *Year  = 1;
  73         return;
  74 #endif
  75
  76         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
  77         {
  78                 TWI_SendByte(DS1307_DATEREG_START);
  79
  80                 TWI_StopTransmission();
  81         }
  82
  83         DS1307_DateRegs_t CurrentRTCDate;
  84
  85         if (TWI_StartTransmission(DS1307_ADDRESS_READ))
  86         {
  87                 TWI_ReceiveByte(&CurrentRTCDate.Byte1.IntVal, false);
  88                 TWI_ReceiveByte(&CurrentRTCDate.Byte2.IntVal, false);
  89                 TWI_ReceiveByte(&CurrentRTCDate.Byte3.IntVal, true);
  90
  91                 TWI_StopTransmission();
  92         }
  93
  94         *Day    = (CurrentRTCDate.Byte1.TenDay   * 10) + CurrentRTCDate.Byte1.Day;
  95         *Month  = (CurrentRTCDate.Byte2.TenMonth * 10) + CurrentRTCDate.Byte2.Month;
  96         *Year   = (CurrentRTCDate.Byte3.TenYear  * 10) + CurrentRTCDate.Byte3.Year;
  97 }
  98
  99 void DS1307_GetTime(uint8_t* Hour, uint8_t* Minute, uint8_t* Second)
 100 {
 101 #if defined(DUMMY_RTC)
 102         *Hour   = 1;
 103         *Minute = 1;
 104         *Second = 1;
 105         return;
 106 #endif
 107
 108         if (TWI_StartTransmission(DS1307_ADDRESS_WRITE))
 109         {
 110                 TWI_SendByte(DS1307_TIMEREG_START);
 111
 112                 TWI_StopTransmission();
 113         }
 114
 115         DS1307_TimeRegs_t CurrentRTCTime;
 116
 117         if (TWI_StartTransmission(DS1307_ADDRESS_READ))
 118         {
 119                 TWI_ReceiveByte(&CurrentRTCTime.Byte1.IntVal, false);
 120                 TWI_ReceiveByte(&CurrentRTCTime.Byte2.IntVal, false);
 121                 TWI_ReceiveByte(&CurrentRTCTime.Byte3.IntVal, true);
 122
 123                 TWI_StopTransmission();
 124         }
 125
 126         *Second  = (CurrentRTCTime.Byte1.TenSec  * 10) + CurrentRTCTime.Byte1.Sec;
 127         *Minute  = (CurrentRTCTime.Byte2.TenMin  * 10) + CurrentRTCTime.Byte2.Min;
 128         *Hour    = (CurrentRTCTime.Byte3.TenHour * 10) + CurrentRTCTime.Byte3.Hour;
 129 }