Sync SD log with card at 4Hz interval

speeduino/SD_logger.h

@@ -70,6 +70,7 @@ void writeSDLogEntry();
 void writetSDLogHeader();
 void beginSDLogging();
 void endSDLogging();
+void syncSDLog();
 void setTS_SD_status();
 void formatExFat();
 void deleteLogFile(char, char, char, char);

speeduino/SD_logger.ino

@@ -445,6 +445,14 @@ void checkForSDStop()
   
 }
 
+void syncSDLog()
+{     
+  if( (SD_status == SD_STATUS_ACTIVE) && (!logFile.isBusy()) )
+  {
+    logFile.sync();
+  }
+}
+
 /** 
  * Will perform a complete format of the SD card to ExFAT. 
  * This will delete all files and create a new empty file system.

speeduino/speeduino.ino

@@ -308,6 +308,7 @@ void loop(void)
 
       #ifdef SD_LOGGING
         if(configPage13.onboard_log_file_rate == LOGGER_RATE_4HZ) { writeSDLogEntry(); }
+        syncSDLog(); //Sync the SD log file to the card 4 times per second. 
       #endif  
       
       currentStatus.fuelPressure = getFuelPressure();