Add volatile software RTC to the TempDataLogger application if the dummy RTC mode is enabled.

Projects/TempDataLogger/Lib/DS1307.c

@@ -7,9 +7,98 @@
 
 #include "DS1307.h"
 
-bool DS1307_SetTimeDate(const TimeDate_t* NewTimeDate)
+#if defined(DUMMY_RTC)
+
+/** Current dummy RTC time and date */
+static volatile TimeDate_t DummyRTC_Count;
+
+void RTC_Init(void)
+{
+	DummyRTC_Count.Hour   = 0;
+	DummyRTC_Count.Minute = 0;
+	DummyRTC_Count.Second = 0;
+	DummyRTC_Count.Day    = 1;
+	DummyRTC_Count.Month  = 1;
+	DummyRTC_Count.Year   = 00;
+}
+
+void RTC_Tick500ms(void)
+{
+	static bool HalfSecondElapsed = false;
+
+	HalfSecondElapsed = !HalfSecondElapsed;
+	if (HalfSecondElapsed == false)
+	  return;
+
+	if (++DummyRTC_Count.Second < 60)
+	  return;
+
+	DummyRTC_Count.Second = 0;
+
+	if (++DummyRTC_Count.Minute < 60)
+	  return;
+
+	DummyRTC_Count.Minute = 0;
+
+	if (++DummyRTC_Count.Hour < 24)
+	  return;
+
+	DummyRTC_Count.Hour = 0;
+
+	static const char MonthLength[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+	uint8_t DaysInMonth = MonthLength[DummyRTC_Count.Month - 1];
+
+	/* Check if we need to account for a leap year */
+	if ((DummyRTC_Count.Month == 2) &&
+	    ((!(DummyRTC_Count.Year % 400)) || ((DummyRTC_Count.Year % 100) && !(DummyRTC_Count.Year % 4))))
+	{
+		DaysInMonth++;
+	}
+
+	if (++DummyRTC_Count.Day <= DaysInMonth)
+	  return;
+
+	DummyRTC_Count.Day = 1;
+
+	if (++DummyRTC_Count.Month <= 12)
+	  return;
+
+	DummyRTC_Count.Month = 1;
+	DummyRTC_Count.Year++;
+}
+
+bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
+{
+	GlobalInterruptDisable();
+	DummyRTC_Count = *NewTimeDate;
+	GlobalInterruptEnable();
+
+	return true;
+}
+
+bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
+{
+	GlobalInterruptDisable();
+	*TimeDate = DummyRTC_Count;
+	GlobalInterruptEnable();
+
+	return true;
+}
+
+#else
+
+void RTC_Init(void)
+{
+	/* Unused for a real external DS1307 RTC device */
+}
+
+void RTC_Tick500ms(void)
+{
+	/* Unused for a real external DS1307 RTC device */
+}
+
+bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate)
 {
-#if !defined(DUMMY_RTC)
 	DS1307_DateTimeRegs_t NewRegValues;
 	const uint8_t         WriteAddress = 0;
 
@@ -38,22 +127,12 @@ bool DS1307_SetTimeDate(const TimeDate_t* NewTimeDate)
 	{
 		return false;
 	}
-#endif
 
 	return true;
 }
 
-bool DS1307_GetTimeDate(TimeDate_t* const TimeDate)
+bool RTC_GetTimeDate(TimeDate_t* const TimeDate)
 {
-#if defined(DUMMY_RTC)
-	TimeDate->Hour   = 1;
-	TimeDate->Minute = 1;
-	TimeDate->Second = 1;
-
-	TimeDate->Day    = 1;
-	TimeDate->Month  = 1;
-	TimeDate->Year   = 1;
-#else
 	DS1307_DateTimeRegs_t CurrentRegValues;
 	const uint8_t         ReadAddress = 0;
 
@@ -73,8 +152,8 @@ bool DS1307_GetTimeDate(TimeDate_t* const TimeDate)
 	TimeDate->Day    = (CurrentRegValues.Byte5.Fields.TenDay   * 10) + CurrentRegValues.Byte5.Fields.Day;
 	TimeDate->Month  = (CurrentRegValues.Byte6.Fields.TenMonth * 10) + CurrentRegValues.Byte6.Fields.Month;
 	TimeDate->Year   = (CurrentRegValues.Byte7.Fields.TenYear  * 10) + CurrentRegValues.Byte7.Fields.Year;
-#endif
 
 	return true;
 }
 
+#endif

Projects/TempDataLogger/Lib/DS1307.h

@@ -5,14 +5,14 @@
            www.lufa-lib.org
 */
 
-#ifndef _DS1307_H_
-#define _DS1307_H_
+#ifndef _RTC_H_
+#define _RTC_H_
 
 	/* Includes: */
 		#include <avr/io.h>
 
 		#include <LUFA/Drivers/Peripheral/TWI.h>
-		
+
 		#include "Config/AppConfig.h"
 
 	/* Type Defines: */
@@ -117,8 +117,10 @@
 		#define DS1307_ADDRESS       0xD0
 
 	/* Function Prototypes: */
-		bool DS1307_SetTimeDate(const TimeDate_t* NewTimeDate);
-		bool DS1307_GetTimeDate(TimeDate_t* const TimeDate);
+		void RTC_Init(void);
+		void RTC_Tick500ms(void);
+		bool RTC_SetTimeDate(const TimeDate_t* NewTimeDate);
+		bool RTC_GetTimeDate(TimeDate_t* const TimeDate);
 
 #endif
 

Projects/TempDataLogger/Lib/FATFs/diskio.c

@@ -85,7 +85,7 @@ DWORD get_fattime (void)
 {
 	TimeDate_t CurrTimeDate;
 
-	DS1307_GetTimeDate(&CurrTimeDate);
+	RTC_GetTimeDate(&CurrTimeDate);
 
 
 	return ((DWORD)(20 + CurrTimeDate.Year) << 25) |