Change to logging file system.

This commit is somewhat temporary as I have come up with a better scheme and will be modifying this.  Just making this commit in case I need to roll back

ArduPlane/ArduPlane.pde

@@ -450,7 +450,9 @@ void loop()
 		if (millis() - perf_mon_timer > 20000) {
 			if (mainLoop_count != 0) {
 				if (g.log_bitmask & MASK_LOG_PM)
+					#if HIL_MODE != HIL_MODE_ATTITUDE
 					Log_Write_Performance();
+					#endif
 
 				resetPerfData();
 			}

ArduPlane/Log.pde

@@ -53,7 +53,9 @@ print_log_menu(void)
 {
 	int log_start;
 	int log_end;
-	byte last_log_num = get_num_logs();
+	int temp;
+	uint16_t num_logs = get_num_logs();
+//Serial.print("num logs: ");	Serial.println(num_logs, DEC);
 
 	Serial.printf_P(PSTR("logs enabled: "));
 	if (0 == g.log_bitmask) {
@@ -78,15 +80,16 @@ print_log_menu(void)
 	}
 	Serial.println();
 
-	if (last_log_num == 0) {
+	if (num_logs == 0) {
 		Serial.printf_P(PSTR("\nNo logs available for download\n"));
 	}else{
 
-		Serial.printf_P(PSTR("\n%d logs available for download\n"), last_log_num);
-		for(int i=1;i<last_log_num+1;i++) {
-			get_log_boundaries(i, log_start, log_end);
+		Serial.printf_P(PSTR("\n%d logs available for download\n"), num_logs);
+		for(int i=num_logs;i>=1;i--) {
+			temp = g.log_last_filenumber-i+1;
+			get_log_boundaries(temp, log_start, log_end);
 			Serial.printf_P(PSTR("Log number %d,    start page %d,   end page %d\n"),
-							i, log_start, log_end);
+							temp, log_start, log_end);
 		}
 		Serial.println();
 	}
@@ -103,8 +106,8 @@ dump_log(uint8_t argc, const Menu::arg *argv)
 
 	// check that the requested log number can be read
 	dump_log = argv[1].i;
-	last_log_num = get_num_logs();
-	if ((argc != 2) || (dump_log < 1) || (dump_log > last_log_num)) {
+	last_log_num = g.log_last_filenumber;
+	if ((argc != 2) || (dump_log <= (last_log_num - get_num_logs())) || (dump_log > last_log_num)) {
 		Serial.printf_P(PSTR("bad log number\n"));
 		return(-1);
 	}
@@ -128,15 +131,13 @@ erase_logs(uint8_t argc, const Menu::arg *argv)
 		delay(1000);
 	}
 	Serial.printf_P(PSTR("\nErasing log...\n"));
-	for(int j = 1; j < 4096; j++)
+	DataFlash.SetFileNumber(0xFFFF);
+	for(int j = 1; j <= DF_LAST_PAGE; j++) {
 		DataFlash.PageErase(j);
-	DataFlash.StartWrite(1);
-	DataFlash.WriteByte(HEAD_BYTE1);
-	DataFlash.WriteByte(HEAD_BYTE2);
-	DataFlash.WriteByte(LOG_INDEX_MSG);
-	DataFlash.WriteByte(0);
-	DataFlash.WriteByte(END_BYTE);
-	DataFlash.FinishWrite();
+		DataFlash.StartWrite(j);		// We need this step to clean FileNumbers
+	}
+	g.log_last_filenumber.set_and_save(0);
+	
 	Serial.printf_P(PSTR("\nLog erased.\n"));
     return 0;
 }
@@ -194,137 +195,196 @@ process_logs(uint8_t argc, const Menu::arg *argv)
 
 static byte get_num_logs(void)
 {
-	int page = 1;
-	byte data;
-	byte log_step = 0;
+	uint16_t lastpage;
+	uint16_t last;
+	uint16_t first;
+/*
+for (int counter=1;counter<=4096;counter++){
+DataFlash.StartRead(counter);
+Serial.print(counter, DEC);							Serial.print("\t");
+Serial.print(DataFlash.GetFileNumber(), DEC);		Serial.print("\t");
+Serial.println(DataFlash.GetFilePage(), DEC);		
+}
+*/
 
-	DataFlash.StartRead(1);
 
-	while (page == 1) {
-		data = DataFlash.ReadByte();
 
-		switch(log_step){		 //This is a state machine to read the packets
-			case 0:
-				if(data==HEAD_BYTE1)	// Head byte 1
-					log_step++;
-				break;
 
-			case 1:
-				if(data==HEAD_BYTE2)	// Head byte 2
-					log_step++;
-				else
-					log_step = 0;
-				break;
 
-			case 2:
-				if(data==LOG_INDEX_MSG){
-					byte num_logs = DataFlash.ReadByte();
-					return num_logs;
-				}else{
-						log_step=0;	 // Restart, we have a problem...
-				}
-				break;
-			}
-		page = DataFlash.GetPage();
+	if(g.log_last_filenumber < 1) return 0;
+	
+	DataFlash.StartRead(1);
+//Serial.print("getfilenumber: ");
+//Serial.println(DataFlash.GetFileNumber(), DEC);
+	if(DataFlash.GetFileNumber() == 0XFFFF) return 0;
+	
+	lastpage = find_last_log_page(g.log_last_filenumber);
+//Serial.println(lastpage, DEC);
+	DataFlash.StartRead(lastpage);
+	last = DataFlash.GetFileNumber();
+//Serial.println(last, DEC);
+	DataFlash.StartRead(lastpage + 2);
+	first = DataFlash.GetFileNumber();
+//Serial.println(first, DEC);
+	if(first == 0xFFFF) {
+		DataFlash.StartRead(1);
+		first = DataFlash.GetFileNumber();
+	}
+	if(last == first) 
+	{
+		return 1;
+	} else {
+		return (last - first + 1);
 	}
-	return 0;
 }
+	
 
-// send the number of the last log?
-static void start_new_log(byte num_existing_logs)
+static void start_new_log()
 {
-	int start_pages[50] = {0,0,0};
-	int end_pages[50]	= {0,0,0};
 
-	if(num_existing_logs > 0) {
-		for(int i=0;i<num_existing_logs;i++) {
-			get_log_boundaries(i+1,start_pages[i],end_pages[i]);
-		}
-		end_pages[num_existing_logs - 1] = find_last_log_page(start_pages[num_existing_logs - 1]);
-	}
+uint16_t	last_page;
 
-	if(num_existing_logs == 0 ||
-       (end_pages[num_existing_logs - 1] < 4095 && num_existing_logs < MAX_NUM_LOGS)) {
-		if(num_existing_logs > 0)
-			start_pages[num_existing_logs] = end_pages[num_existing_logs - 1] + 1;
-		else
-			start_pages[0] = 2;
-		num_existing_logs++;
-		DataFlash.StartWrite(1);
-		DataFlash.WriteByte(HEAD_BYTE1);
-		DataFlash.WriteByte(HEAD_BYTE2);
-		DataFlash.WriteByte(LOG_INDEX_MSG);
-		DataFlash.WriteByte(num_existing_logs);
-		for(int i=0;i<MAX_NUM_LOGS;i++) {
-			DataFlash.WriteInt(start_pages[i]);
-			DataFlash.WriteInt(end_pages[i]);
-		}
-		DataFlash.WriteByte(END_BYTE);
-		DataFlash.FinishWrite();
-		DataFlash.StartWrite(start_pages[num_existing_logs-1]);
-	}else{
-		gcs_send_text_P(SEVERITY_LOW,PSTR("<start_new_log> Logs full - logging discontinued"));
+	//Serial.print("last filenumber: ");	Serial.println(g.log_last_filenumber, DEC);
+	if(g.log_last_filenumber < 1) {
+		last_page = 0;
+	} else {
+		last_page = find_last_log_page(g.log_last_filenumber);
 	}
+	g.log_last_filenumber.set_and_save(g.log_last_filenumber+1);
+	//Serial.print("last filenumber: ");	Serial.println(g.log_last_filenumber, DEC);
+	DataFlash.SetFileNumber(g.log_last_filenumber);
+	DataFlash.StartWrite(last_page + 1);
 }
 
 static void get_log_boundaries(byte log_num, int & start_page, int & end_page)
 {
-	int page 		= 1;
-	byte data;
-	byte log_step	= 0;
-
-	DataFlash.StartRead(1);
-	while (page == 1) {
-		data = DataFlash.ReadByte();
-		switch(log_step)		 //This is a state machine to read the packets
-			{
-			case 0:
-				if(data==HEAD_BYTE1)	// Head byte 1
-					log_step++;
-				break;
-			case 1:
-				if(data==HEAD_BYTE2)	// Head byte 2
-					log_step++;
-				else
-					log_step = 0;
-				break;
-			case 2:
-				if(data==LOG_INDEX_MSG){
-					byte num_logs = DataFlash.ReadByte();
-					for(int i=0;i<log_num;i++) {
-						start_page = DataFlash.ReadInt();
-						end_page = DataFlash.ReadInt();
-					}
-					if(log_num==num_logs)
-						end_page = find_last_log_page(start_page);
-
-					return;		// This is the normal exit point
-				}else{
-						log_step=0;	 // Restart, we have a problem...
-				}
-				break;
+	int num = get_num_logs();
+	if(num == 1)
+	{
+		DataFlash.StartRead(DF_LAST_PAGE);
+		if(DataFlash.GetFileNumber() == 0xFFFF) 
+		{
+			start_page = 1;
+			end_page = find_last_log_page((uint16_t)log_num);
+		} else {
+			end_page = find_last_log_page((uint16_t)log_num);
+			start_page = end_page + 1;
+		}
+		
+	} else {
+		end_page = find_last_log_page((uint16_t)log_num);
+		if(log_num==1)
+			start_page = 1;
+		else
+			if(log_num == g.log_last_filenumber - num + 1) {
+				start_page = find_last_log_page(g.log_last_filenumber) + 1;
+			} else {
+				start_page = find_last_log_page((uint16_t)(log_num-1)) + 1;
 			}
-		page = DataFlash.GetPage();
 	}
-	//  Error condition if we reach here with page = 2   TO DO - report condition
+	if(start_page == DF_LAST_PAGE+1 || start_page == 0) start_page=1;
 }
+			
+		
 
-static int find_last_log_page(int bottom_page)
+static int find_last_log_page(uint16_t log_number)
 {
-	int top_page = 4096;
-	int look_page;
-	int32_t check;
+	int16_t bottom_page;
+	int16_t top_page;
+	int16_t bottom_page_file;
+	int16_t bottom_page_filepage;
+	int16_t top_page_file;
+	int16_t top_page_filepage;
+	int16_t look_page;
+	int16_t look_page_file;
+	int16_t look_page_filepage;
+	int16_t check;
+//Serial.print("in find last log page looking for: ");	Serial.println(log_number, DEC);
+	// First see if the logs are empty
+	DataFlash.StartRead(1);
+	if(DataFlash.GetFileNumber() == 0XFFFF) {
+	//Serial.println("not here");
+	return 0;
+	}
+	
+	// Next, see if logs wrap the top of the dataflash
+	DataFlash.StartRead(DF_LAST_PAGE);
+	if(DataFlash.GetFileNumber() == 0xFFFF)
+	{
+	// This case is that we have not wrapped the top of the dataflash
+	
+		top_page = DF_LAST_PAGE;
+		bottom_page = 1;
+		while((top_page - bottom_page) > 1) {
+			look_page = (top_page + bottom_page) / 2;
+			DataFlash.StartRead(look_page);
+//Serial.print("look page: ");
+//Serial.print(look_page, DEC);
+//Serial.print("\t ");
+//Serial.println(DataFlash.GetFileNumber(), DEC);
+			if(DataFlash.GetFileNumber() > log_number)
+				top_page = look_page;
+			else 
+				bottom_page = look_page;
+		}
+		 return bottom_page;
+	} else {
+	// The else case is that the logs do wrap the top of the dataflash
+		bottom_page = 1;
+		top_page = DF_LAST_PAGE;
+		DataFlash.StartRead(bottom_page);
+		bottom_page_file = DataFlash.GetFileNumber();
+		bottom_page_filepage = DataFlash.GetFilePage();
+		DataFlash.StartRead(top_page);
+		top_page_file = DataFlash.GetFileNumber();
+		top_page_filepage = DataFlash.GetFilePage();
+		
+		// Check is we have exactly filled the dataflash but not wrapped
+		if(top_page_file == log_number && bottom_page_file != log_number) 
+		{
+		return top_page_file;
+		}
+		
+		// Check if the top is 1 file higher than we want.  If so we can exit quickly.
+		if(top_page_file == log_number+1)
+		{
+		//Serial.println("There");
+		return top_page - top_page_filepage;
+		}
 
-	while((top_page - bottom_page) > 1) {
-		look_page = (top_page + bottom_page) / 2;
-		DataFlash.StartRead(look_page);
-		check = DataFlash.ReadLong();
-		if(check == -1L)
-			top_page = look_page;
-		else
-			bottom_page = look_page;
+		// Step down through the files to find the one we want
+		bottom_page = top_page;
+		bottom_page_filepage = top_page_filepage;
+		do
+		{
+			top_page = bottom_page;
+			bottom_page = bottom_page - bottom_page_filepage;
+			if(bottom_page < 1) bottom_page = 1;
+			DataFlash.StartRead(bottom_page);
+			bottom_page_file = DataFlash.GetFileNumber();
+			bottom_page_filepage = DataFlash.GetFilePage();
+//Serial.print("Page, File and Pages: ");	//Serial.print(bottom_page, DEC);	Serial.print("\t");Serial.print(bottom_page_file, DEC);	Serial.print("\t");		Serial.println(bottom_page_filepage);
+		} while (bottom_page_file != log_number);
+Serial.print("bottom Page, File and Pages: ");	Serial.print(bottom_page, DEC);	Serial.print("\t");Serial.print(bottom_page_file, DEC);	Serial.print("\t");		Serial.println(bottom_page_filepage);
+		
+		// Check if we have wrapped multiple times
+		if(bottom_page == 1 && bottom_page_file == log_number) return DF_LAST_PAGE;
+		
+		// Deal with stepping down too far due to overwriting a file
+		while((top_page - bottom_page) > 1) {
+			look_page = (top_page + bottom_page) / 2;
+			DataFlash.StartRead(look_page);
+//Serial.print("look page2: ");
+//Serial.print(look_page, DEC);
+//Serial.print("\t ");
+//Serial.println(DataFlash.GetFileNumber(), DEC);
+			if(DataFlash.GetFileNumber() < log_number)
+				top_page = look_page;
+			else 
+				bottom_page = look_page;
+		}
+		 return bottom_page;
 	}
-	return top_page;
 }
 
 
@@ -341,6 +401,7 @@ static void Log_Write_Attitude(int log_roll, int log_pitch, uint16_t log_yaw)
 }
 
 // Write a performance monitoring packet. Total length : 19 bytes
+#if HIL_MODE != HIL_MODE_ATTITUDE
 static void Log_Write_Performance()
 {
 	DataFlash.WriteByte(HEAD_BYTE1);
@@ -361,6 +422,7 @@ static void Log_Write_Performance()
 	DataFlash.WriteInt(pmTest1);
 	DataFlash.WriteByte(END_BYTE);
 }
+#endif
 
 // Write a command processing packet. Total length : 19 bytes
 //void Log_Write_Cmd(byte num, byte id, byte p1, long alt, long lat, long lng)
@@ -645,17 +707,33 @@ static void Log_Read_Raw()
 // Read the DataFlash log memory : Packet Parser
 static void Log_Read(int start_page, int end_page)
 {
-	byte data;
-	byte log_step = 0;
 	int packet_count = 0;
-	int page = start_page;
-
+	
 	#ifdef AIRFRAME_NAME
 		Serial.printf_P(PSTR((AIRFRAME_NAME)
 	#endif
 	Serial.printf_P(PSTR("\n" THISFIRMWARE
 						 "\nFree RAM: %u\n"),
                     memcheck_available_memory());
+                    
+    if(start_page > end_page)
+    {
+    	packet_count = Log_Read_Process(start_page, DF_LAST_PAGE);
+    	packet_count += Log_Read_Process(1, end_page);
+    } else {
+    	packet_count = Log_Read_Process(start_page, end_page);
+    }
+                    
+	Serial.printf_P(PSTR("Number of packets read: %d\n"), packet_count);
+}
+
+// Read the DataFlash log memory : Packet Parser
+static int Log_Read_Process(int start_page, int end_page)
+{
+	byte data;
+	byte log_step = 0;
+	int page = start_page;
+	int packet_count = 0;
 
 	DataFlash.StartRead(start_page);
 	while (page < end_page && page != -1){
@@ -729,7 +807,6 @@ static void Log_Read(int start_page, int end_page)
 			}
 		page = DataFlash.GetPage();
 		}
-	Serial.printf_P(PSTR("Number of packets read: %d\n"), packet_count);
 }
 
 #else // LOGGING_ENABLED
@@ -745,7 +822,7 @@ static void Log_Write_GPS(	long log_Time, long log_Lattitude, long log_Longitude
 static void Log_Write_Performance() {}
 static int8_t process_logs(uint8_t argc, const Menu::arg *argv) { return 0; }
 static byte get_num_logs(void) { return 0; }
-static void start_new_log(byte num_existing_logs) {}
+static void start_new_log() {}
 static void Log_Write_Attitude(int log_roll, int log_pitch, uint16_t log_yaw) {}
 static void Log_Write_Control_Tuning() {}
 static void Log_Write_Raw() {}

ArduPlane/Parameters.h

@@ -69,6 +69,7 @@ public:
         k_param_flap_2_percent,
         k_param_flap_2_speed,
         k_param_num_resets,
+        k_param_log_last_filenumber,
 
 
 		// 110: Telemetry control
@@ -305,6 +306,7 @@ public:
     AP_Int8     reverse_ch2_elevon;
     AP_Int16    num_resets;
     AP_Int16    log_bitmask;
+    AP_Int16	log_last_filenumber;
     AP_Int16    airspeed_cruise;
     AP_Int16    pitch_trim;
     AP_Int16    RTL_altitude;
@@ -410,6 +412,7 @@ public:
         reverse_ch2_elevon      (ELEVON_CH2_REVERSE,        k_param_reverse_ch2_elevon,     PSTR("ELEVON_CH2_REV")),
         num_resets              (0,                         k_param_num_resets,             PSTR("SYS_NUM_RESETS")),
         log_bitmask             (DEFAULT_LOG_BITMASK,		k_param_log_bitmask,            PSTR("LOG_BITMASK")),
+        log_last_filenumber     (0,							k_param_log_last_filenumber,    PSTR("LOG_LASTFILE")),
         airspeed_cruise         (AIRSPEED_CRUISE_CM,        k_param_airspeed_cruise,        PSTR("TRIM_ARSPD_CM")),
         pitch_trim              (0,                         k_param_pitch_trim,             PSTR("TRIM_PITCH_CD")),
         RTL_altitude            (ALT_HOLD_HOME_CM,          k_param_RTL_altitude,           PSTR("ALT_HOLD_RTL")),

ArduPlane/system.pde

@@ -210,10 +210,7 @@ static void init_ardupilot()
 #endif // CLI_ENABLED
 
 	if(g.log_bitmask != 0){
-		//	TODO - Here we will check  on the length of the last log
-		//  We don't want to create a bunch of little logs due to powering on and off
-		byte last_log_num = get_num_logs();
-		start_new_log(last_log_num);
+		start_new_log();
 	}
 
 	// read in the flight switches

libraries/DataFlash/DataFlash.cpp

@@ -35,7 +35,7 @@
 #include "DataFlash.h"
 #include <SPI.h>
 
-#define OVERWRITE_DATA 0 // 0: When reach the end page stop, 1: Start overwritten from page 1
+#define OVERWRITE_DATA 1 // 0: When reach the end page stop, 1: Start overwriting from page 1
 
 // *** INTERNAL FUNCTIONS ***
 
@@ -160,6 +160,7 @@ void DataFlash_Class::PageToBuffer(unsigned char BufferNum, unsigned int PageAdr
   while(!ReadStatus());  //monitor the status register, wait until busy-flag is high
   
   dataflash_CS_inactive();
+  
 }
 
 void DataFlash_Class::BufferToPage (unsigned char BufferNum, unsigned int PageAdr, unsigned char wait)
@@ -271,10 +272,15 @@ void DataFlash_Class::ChipErase ()
 void DataFlash_Class::StartWrite(int PageAdr)
 {
   df_BufferNum=1;
-  df_BufferIdx=0;
+  df_BufferIdx=4;
   df_PageAdr=PageAdr;
   df_Stop_Write=0;
   WaitReady();
+      // We are starting a new page - write FileNumber and FilePage
+  		BufferWrite(df_BufferNum,0,df_FileNumber>>8);   // High byte
+  		BufferWrite(df_BufferNum,1,df_FileNumber&0xFF); // Low byte
+  		BufferWrite(df_BufferNum,2,df_FilePage>>8);   // High byte
+  		BufferWrite(df_BufferNum,3,df_FilePage&0xFF); // Low byte
 }
 
 void DataFlash_Class::FinishWrite(void)
@@ -284,12 +290,12 @@ void DataFlash_Class::FinishWrite(void)
 	df_PageAdr++;
 	if (OVERWRITE_DATA==1)
 	    {
-        if (df_PageAdr>=4096)  // If we reach the end of the memory, start from the begining
+        if (df_PageAdr>DF_LAST_PAGE)  // If we reach the end of the memory, start from the begining
 		  df_PageAdr = 1;
 	    }
 	else
 	    {
-        if (df_PageAdr>=4096)  // If we reach the end of the memory, stop here
+        if (df_PageAdr>DF_LAST_PAGE)  // If we reach the end of the memory, stop here
 		  df_Stop_Write=1;
 	    }
 
@@ -306,19 +312,19 @@ void DataFlash_Class::WriteByte(byte data)
     {
     BufferWrite(df_BufferNum,df_BufferIdx,data);
     df_BufferIdx++;
-    if (df_BufferIdx >= df_PageSize)  // End of buffer?
+    if (df_BufferIdx >= df_PageSize)  // End of buffer?   
       {
-      df_BufferIdx=0;
+      df_BufferIdx=4;		//(4 bytes for FileNumber, FilePage)
 	  BufferToPage(df_BufferNum,df_PageAdr,0);  // Write Buffer to memory, NO WAIT
       df_PageAdr++;
 	  if (OVERWRITE_DATA==1)
 	    {
-        if (df_PageAdr>=4096)  // If we reach the end of the memory, start from the begining
+        if (df_PageAdr>DF_LAST_PAGE)  // If we reach the end of the memory, start from the begining
 		  df_PageAdr = 1;
 	    }
       else
 	    {
-        if (df_PageAdr>=4096)  // If we reach the end of the memory, stop here
+        if (df_PageAdr>DF_LAST_PAGE)  // If we reach the end of the memory, stop here
 		  df_Stop_Write=1;
 	    }
 
@@ -326,6 +332,12 @@ void DataFlash_Class::WriteByte(byte data)
         df_BufferNum=2;
       else
         df_BufferNum=1;
+      // We are starting a new page - write FileNumber and FilePage
+  		BufferWrite(df_BufferNum,0,df_FileNumber>>8);   // High byte
+  		BufferWrite(df_BufferNum,1,df_FileNumber&0xFF); // Low byte
+  		df_FilePage++;
+  		BufferWrite(df_BufferNum,2,df_FilePage>>8);   // High byte
+  		BufferWrite(df_BufferNum,3,df_FilePage&0xFF); // Low byte
       }
     }
 }
@@ -359,11 +371,19 @@ int DataFlash_Class::GetPage()
 void DataFlash_Class::StartRead(int PageAdr)
 {
   df_Read_BufferNum=1;
-  df_Read_BufferIdx=0;
+  df_Read_BufferIdx=4;
   df_Read_PageAdr=PageAdr;
   WaitReady();
   PageToBuffer(df_Read_BufferNum,df_Read_PageAdr);  // Write Memory page to buffer
+//Serial.print(df_Read_PageAdr, DEC);	Serial.print("\t");
   df_Read_PageAdr++;
+      // We are starting a new page - read FileNumber and FilePage
+  		df_FileNumber = BufferRead(df_Read_BufferNum,0);   // High byte
+//Serial.print(df_FileNumber, DEC);	Serial.print("\t");
+  		df_FileNumber = (df_FileNumber<<8) | BufferRead(df_Read_BufferNum,1); // Low byte
+//Serial.println(df_FileNumber, DEC);	Serial.print("\t");
+  		df_FilePage = BufferRead(df_Read_BufferNum,2);   // High byte
+  		df_FilePage = (df_FilePage<<8) | BufferRead(df_Read_BufferNum,3); // Low byte
 }
 
 byte DataFlash_Class::ReadByte()
@@ -373,16 +393,21 @@ byte DataFlash_Class::ReadByte()
   WaitReady();
   result = BufferRead(df_Read_BufferNum,df_Read_BufferIdx);
   df_Read_BufferIdx++;
-  if (df_Read_BufferIdx >= df_PageSize)  // End of buffer?
+  if (df_Read_BufferIdx >= df_PageSize)  // End of buffer?  
     {
-    df_Read_BufferIdx=0;
+    df_Read_BufferIdx=4;		//(4 bytes for FileNumber, FilePage)
     PageToBuffer(df_Read_BufferNum,df_Read_PageAdr);  // Write memory page to Buffer
     df_Read_PageAdr++;
-    if (df_Read_PageAdr>=4096)  // If we reach the end of the memory, start from the begining
+    if (df_Read_PageAdr>DF_LAST_PAGE)  // If we reach the end of the memory, start from the begining
       {
       df_Read_PageAdr = 0;
       df_Read_END = true;
       }
+      // We are starting a new page - read FileNumber and FilePage
+  		df_FileNumber = BufferRead(df_Read_BufferNum,0);   // High byte
+  		df_FileNumber = (df_FileNumber<<8) | BufferRead(df_Read_BufferNum,1); // Low byte
+  		df_FilePage = BufferRead(df_Read_BufferNum,2);   // High byte
+  		df_FilePage = (df_FilePage<<8) | BufferRead(df_Read_BufferNum,3); // Low byte
     }
   return result;
 }
@@ -407,5 +432,23 @@ long DataFlash_Class::ReadLong()
   return result;
 }
 
+void DataFlash_Class::SetFileNumber(uint16_t FileNumber)
+{
+	df_FileNumber = FileNumber;
+	df_FilePage = 1;
+} 
+
+uint16_t DataFlash_Class::GetFileNumber()
+{
+	return df_FileNumber;
+}
+
+uint16_t DataFlash_Class::GetFilePage()
+{
+	return df_FilePage;
+}
+
+
+
 // make one instance for the user to use
 DataFlash_Class DataFlash;

libraries/DataFlash/DataFlash.h

@@ -4,6 +4,10 @@
 #ifndef DataFlash_h
 #define DataFlash_h
 
+#include "../FastSerial/FastSerial.h"
+// flash size
+#define DF_LAST_PAGE 4096
+
 // arduino mega SPI pins
 #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
 	#define DF_DATAOUT 51        // MOSI
@@ -45,15 +49,24 @@ class DataFlash_Class
 	unsigned char df_BufferNum;
 	unsigned char df_Read_BufferNum;
 	uint16_t df_BufferIdx;
+	
 	uint16_t df_Read_BufferIdx;
+	
 	uint16_t df_PageAdr;
+	
 	uint16_t df_Read_PageAdr;
+	
 	unsigned char df_Read_END;
 	unsigned char df_Stop_Write;
+	uint16_t df_FileNumber;
+	uint16_t df_FilePage;
 	//Methods
 	unsigned char BufferRead (unsigned char BufferNum, uint16_t IntPageAdr);
+	
 	void BufferWrite (unsigned char BufferNum, uint16_t IntPageAdr, unsigned char Data);
+	
 	void BufferToPage (unsigned char BufferNum, uint16_t PageAdr, unsigned char wait);
+	
 	void PageToBuffer(unsigned char BufferNum, uint16_t PageAdr);
 	void WaitReady();
 	unsigned char ReadStatusReg();
@@ -69,22 +82,32 @@ class DataFlash_Class
 	DataFlash_Class(); // Constructor
 	void Init();
 	void ReadManufacturerID();
-	int16_t GetPage();
+	int16_t GetPage();
 	int16_t GetWritePage();
+	
 	void PageErase (uint16_t PageAdr);
+	
 	void ChipErase ();
 	// Write methods
 	void StartWrite(int16_t PageAdr);
+	
 	void FinishWrite();
 	void WriteByte(unsigned char data);
 	void WriteInt(int16_t data);
+	
 	void WriteLong(int32_t data);
 
 	// Read methods
 	void StartRead(int16_t PageAdr);
+	
 	unsigned char ReadByte();
 	int16_t ReadInt();
+	
 	int32_t ReadLong();
+
+	void SetFileNumber(uint16_t FileNumber);
+	uint16_t GetFileNumber();
+	uint16_t GetFilePage();
 };
 
 extern DataFlash_Class DataFlash;