Including mktime() in MCF52235.mcp (CW v6.4)

[lifestream]

Hi,

I am trying to use the mktime() and localtime() functions in my MCF52235 project, however, I got a Linked Error saying that the functions are undefined even I had already include the <time.h>. Anyone has any idea to include such functions? Thanks in advance.


Best regards,
Chen Khoi

p/s: I am using CodeWarrior v6.4.

[CrasyCat]

Hello

MSL library for embedded platform do not come with time function enabled per default.

Please refer to the manual {Install}\Help\PDF\MSL_C_Reference.pdf, chapter "Configuring MSL C" section "Configuring Time and Clock" for more information on how you can extend the library to support clock and time functions.

I hope this helps.

CrasyCat

[lifestream]

Hi CrasyCat,

Thanks for the direction. I try to modify the macro in "ansi_prefix.e68k.h" which sets

#ifndef _MSL_OS_TIME_SUPPORT
    #define _MSL_OS_TIME_SUPPORT    1
#endif

#ifndef _MSL_CLOCK_T_AVAILABLE
    #define _MSL_CLOCK_T_AVAILABLE     1
#endif

#ifndef _MSL_TIME_T_AVAILABLE
    #define _MSL_TIME_T_AVAILABLE    1
#endif

After I compile my file again, same "undefined" problem happened. Am I doing the right thing here? Can you show me how actually to extend the library? Thanks in advance.


Chen Khoi

[CrasyCat]

Hello

Well modifying the macros alone is not enough.

You have to provide an implementation of the time related function for your own board (platform).

CrasyCat

[lifestream]

Hi, sorry that I quite confuse on this (newbie).

When you mentioned "an implementation of the time related function on the board", are you saying that I need to implement my own time related functions? If yes, how can I utilize the "mktime()" and "localtime()" functions in the MSL lib?

Thanks for your help.

[CrasyCat]

Hello

I looked at this one a little bit more in detail.

Basically you need to do the following:

 1 - Create a new MSL library file, where _MSL_OS_TIME_SUPPORT, _MSL_TIME_T_AVAILABLE and  

    _MSL_CLOCK_T_AVAILABLE are set.

 2- Replace the MSL library file used in your project by the newly created one

 3- According to the file {Install}\Help\PDF\MSL_C_Reference.pdf, chapter "Configuring MSL C" section

     "Configuring Time and Clock" you need to provide your own implementation of following functions:

     __get_time, __to_gm_time, __to_local_time, __isdst and__get_clock. Please refer to the

    above stated manual to gather info on what these functions are actually doing.

For point 1 above I would proceed as follows:

  - Open the MSL library project. For MCF52235 it is

       {Install}\E68K_Support\msl\MSL_C\MSL_E68k\Project\MSL_C_CF_SZ.mcp file  

  - Check which MSL library you are currently linking in your project (C_4i_CF_SZ_MSL.a,

    C_TRK_4i_CF_SZ_MSL.a....)

  - Select the corresponding Build target (4i ColdFire SZ, TRK 4i ColdFire SZ, ...)

  - In the MSL library project window switch to the Target Tab

  -  Select "Project" -> "Create Target"

  - Specify a name for the new target and tell the IDE you want to clone the target you have identified

     above

  - Select the target target you have just create by clicking on the red target icon in front of the build

    target name. You should see a black arrow in the target.  

  - Open the target setting dialog (Type ALT + F7).

  - Switch to the "Coldfire Target" panel and specify a new name for the new library file (for example

     C_4i_CF_SZ_Time_MSL.a)

  - In the "C/C++ Preprocessor" panel, add following line: "#include <ansi_prefix_Time.h>"

  - Create the file ansi_prefix_Time.h by duplicating the file ansi_prefix.E68k.h and renaming it to

     ansi_prefix_Time.h.

  - In ansi_prefix_Time.h set _MSL_OS_TIME_SUPPORT, _MSL_TIME_T_AVAILABLE and  

    _MSL_CLOCK_T_AVAILABLE to 1.

  - Build the new library.

I would also specify  "#include <ansi_prefix_Time.h>" in your project's "C/C++ Preprocessor" panel.

I hope this helps.

CrasyCat

[lifestream]

Hi, It does help a lot and I am getting a better picture now. Many thanks.