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

LUFA/DoxygenPages/ChangeLog.txt

@@ -31,6 +31,7 @@
   *  - Library Applications:
   *   - Re-added Set Control Line State request handling to the CDC class bootloader to prevent issues with the .NET serial
   *     class (thanks to Erik Lins)
+  *   - TemperatureDataLogger project dummy RTC mode now tracks real time (thanks to David Lazarus)
   *
   *  <b>Fixed:</b>
   *  - Core:

Projects/TempDataLogger/Config/AppConfig.h

@@ -43,6 +43,6 @@
 #ifndef _APP_CONFIG_H_
 #define _APP_CONFIG_H_
 
-//	#define DUMMY_RTC
+	#define DUMMY_RTC
 
 #endif

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

@@ -5,8 +5,8 @@
            www.lufa-lib.org
 */
 
-#ifndef _DS1307_H_
-#define _DS1307_H_
+#ifndef _RTC_H_
+#define _RTC_H_
 
 	/* Includes: */
 		#include <avr/io.h>
@@ -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) |

Projects/TempDataLogger/TempDataLogger.c

@@ -103,7 +103,8 @@ static FIL TempLogFile;
 /** ISR to handle the 500ms ticks for sampling and data logging */
 ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 {
-	uint8_t LEDMask = LEDs_GetLEDs();
+	/* Signal a 500ms tick has elapsed to the RTC */
+	RTC_Tick500ms();
 
 	/* Check to see if the logging interval has expired */
 	if (++CurrentLoggingTicks < LoggingInterval500MS_SRAM)
@@ -112,13 +113,14 @@ ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 	/* Reset log tick counter to prepare for next logging interval */
 	CurrentLoggingTicks = 0;
 
+	uint8_t LEDMask = LEDs_GetLEDs();
 	LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 
 	/* Only log when not connected to a USB host */
 	if (USB_DeviceState == DEVICE_STATE_Unattached)
 	{
 		TimeDate_t CurrentTimeDate;
-		DS1307_GetTimeDate(&CurrentTimeDate);
+		RTC_GetTimeDate(&CurrentTimeDate);
 
 		char     LineBuffer[100];
 		uint16_t BytesWritten;
@@ -170,7 +172,7 @@ void OpenLogFile(void)
 
 	/* Get the current date for the filename as "DDMMYY.csv" */
 	TimeDate_t CurrentTimeDate;
-	DS1307_GetTimeDate(&CurrentTimeDate);
+	RTC_GetTimeDate(&CurrentTimeDate);
 	sprintf(LogFileName, "%02d%02d%02d.csv", CurrentTimeDate.Day, CurrentTimeDate.Month, CurrentTimeDate.Year);
 
 	/* Mount the storage device, open the file */
@@ -206,6 +208,7 @@ void SetupHardware(void)
 	Dataflash_Init();
 	USB_Init();
 	TWI_Init(TWI_BIT_PRESCALE_4, TWI_BITLENGTH_FROM_FREQ(4, 50000));
+	RTC_Init();
 
 	/* 500ms logging interval timer configuration */
 	OCR1A   = (((F_CPU / 1024) / 2) - 1);
@@ -292,7 +295,7 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn
 {
 	Device_Report_t* ReportParams = (Device_Report_t*)ReportData;
 
-	DS1307_GetTimeDate(&ReportParams->TimeDate);
+	RTC_GetTimeDate(&ReportParams->TimeDate);
 
 	ReportParams->LogInterval500MS = LoggingInterval500MS_SRAM;
 
@@ -316,7 +319,7 @@ void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDI
 {
 	Device_Report_t* ReportParams = (Device_Report_t*)ReportData;
 
-	DS1307_SetTimeDate(&ReportParams->TimeDate);
+	RTC_SetTimeDate(&ReportParams->TimeDate);
 
 	/* If the logging interval has changed from its current value, write it to EEPROM */
 	if (LoggingInterval500MS_SRAM != ReportParams->LogInterval500MS)

Projects/TempDataLogger/TemperatureDataLogger.txt

@@ -78,8 +78,8 @@
  *   <tr>
  *    <td>DUMMY_RTC</td>
  *    <td>AppConfig.h</td>
- *    <td>When a DS1307 RTC chip is not fitted, this token can be defined to make the demo assume a 1/1/1 01:01:01 date/time
- *        stamp at all times, effectively transforming the project into a basic data logger with no specified sample times.</td>
+ *    <td>When a DS1307 RTC chip is not fitted, this token can be defined to make the demo use a dummy software RTC using the system
+ *        clock. This is less accurate and does not store the set time and date into non-volatile memory.</td>
  *   </tr>
  *  </table>
  */