Diff: TimeUtilities.h

Revision:

5:fbbdf57675c3

Parent:

4:dfb2e93f804a

Child:

6:a517fee06e2e

diff -r dfb2e93f804a -r fbbdf57675c3 TimeUtilities.h
--- a/TimeUtilities.h	Sat Jul 16 16:57:22 2011 +0000
+++ b/TimeUtilities.h	Sun Oct 30 23:42:43 2011 +0000
@@ -19,6 +19,9 @@
 ///
 /// @note
 /// History
+/// v1.03 20111030
+/// \li Adding an API to adjust time and calibration based on how far it is
+///     off "now", based on when it was set.
 /// v1.02 
 /// \li 20110716 Minor documentation update
 /// \li 20110616 Minor documentation updates
@@ -31,10 +34,8 @@
 #define TIMEUTILITIES_H
 
 #ifndef WIN32
-// embedded build
 #include "mbed.h"
 #else
-// fake it for Windows build
 typedef int int32_t;
 #endif
 
@@ -84,6 +85,26 @@
     ///
     ~RealTimeClock();
 
+    /// GetTimeValue gets the current time in time_t format
+    ///
+    /// Gets the current time from the rtc and returns the time in time_t format.
+    /// This is functionally identical to "return time(NULL);", 
+    /// simply wrapped in this class for convenience.
+    ///
+    /// @returns current time in time_t format
+    ///
+    time_t GetTimeValue();
+    
+    /// GetTimeValueWhenSet gets the time in time_t seconds when the clock was last set
+    ///
+    /// This value represents the time_t time when the clock was set.
+    /// This value is not preserved through power cycles, or resets, in which
+    /// case it will return 0.
+    ///
+    /// @returns time in time_t format when the clock was last set
+    ///
+    time_t GetTimeValueWhenSet();
+    
     /// GetTimeString gets the formatted time applying the internal time-zone offset of hours and minutes
     ///
     /// It places the formatted string into the buffer in the format of
@@ -132,24 +153,6 @@
     ///
     void SetTimeOffset(int offsetHour, int offsetMinute);
 
-    /// SetTimeOffsetStore will store the timezone offset values in RTC ram
-    ///
-    /// This takes the current timezone offset values and stores them in 
-    /// the RTC battery backed ram.
-    ///
-    /// @returns nothing
-    ///
-    void SetTimeOffsetStore();
-
-    /// GetTimeOffsetStore will extract the timezone offset values from RTC ram
-    ///
-    /// This extracts the timezone offset values that were stored in RTC
-    /// battery backed ram and uses them for time information.
-    ///
-    /// @returns nothing
-    ///
-    void GetTimeOffsetStore();
-
     /// GetTimeCalibration will return the calibration register value
     ///
     /// This is the raw register value as a signed 32-bit value (even though
@@ -163,7 +166,11 @@
     ///
     /// This accepts a signed value to be used to set the calibration
     /// registers. Setting the calibration value to zero disables the
-    /// calibration function.
+    /// calibration function. 
+    /// It is important to know the register function in order to use 
+    /// this command, and this API is normally not used by external
+    /// application code. @See AdjustBySeconds for a user-friendly
+    /// API.
     ///
     /// @param calibration value to use ranging from -131071 to +131071
     /// @returns nothing
@@ -184,6 +191,79 @@
     /// @returns true if the time was set
     ///
     bool SetTime(char * timestring);
+    
+    
+    /// AdjustBySeconds adjusts both the time and the calibration by seconds
+    ///
+    /// This will take a signed value, which is the current adjustment in seconds
+    /// to put the clock on the correct time. So, if the clock is behind by
+    /// 3 seconds, the value should be +3 to advance the clock accordingly.
+    /// It will then adjust the time, and it will attempt to adjust the
+    /// calibration factor to make the time more accurate.
+    ///
+    /// The adjustment can only be made if it has retained when the clock was
+    /// last set, in order to know by how much to adjust it. It is also most
+    /// accurate if several days have elapsed since the time was set.
+    ///
+    /// @note The current version only works if the calibration value
+    ///       is zero when this adjustment is made.
+    /// 
+    /// @param adjustSeconds is the signed value by which to adjust the time to
+    ///        correct it to the current actual time.
+    /// @returns true if the adjustment was made
+    /// @returns false if the adjustment could not be made
+    ///
+    bool AdjustBySeconds(int32_t adjustSeconds);
+    
+    /// GetVersion will return a pointer to a constant text string
+    ///
+    /// This returns a pointer to a constant string which represents
+    /// the version of this component.
+    ///
+    /// @returns pointer to a character string holding the version.
+    ///
+    const char * GetVersion();
+    
+private:
+
+    /// SetTimeOffsetStore will store the timezone offset values in RTC ram
+    ///
+    /// This takes the current timezone offset values and stores them in 
+    /// the RTC battery backed ram.
+    ///
+    /// @returns nothing
+    ///
+    void SetTimeOffsetStore();
+
+    /// GetTimeOffsetStore will extract the timezone offset values from RTC ram
+    ///
+    /// This extracts the timezone offset values that were stored in RTC
+    /// battery backed ram and uses them for time information.
+    ///
+    /// @returns nothing
+    ///
+    void GetTimeOffsetStore();
+    
+    /// SetTimeLastSetStore will store the time_t when last set in RTC ram
+    ///
+    /// When the clock is correctly set, the time value will be stored
+    /// which permits later adjustments to the calibration based on 
+    /// elapsed time and knowing when it was set.
+    ///
+    /// @returns nothing
+    ///
+    void SetTimeLastSetStore();
+    
+    /// GetTimeLastSetStore will extract the time_t when last set from RTC ram
+    ///
+    /// When the clock is correctly set, the time value will have been stored
+    /// which permits later adjustments to the calibration based on 
+    /// elapsed time and knowing when it was set. This function retrieves it.
+    ///
+    /// @returns nothing
+    ///
+    void GetTimeLastSetStore();
+
 };
 
 #endif