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What are predefined macros?

Ben Lewis
Prodigy 130 points
Other Parts Discussed in Thread: SYSBIOS

RE: AM335x SYSBIOS Industrial SDK 01.00.00.06 User Guide, Section 12, Building Bootloader.

http://processors.wiki.ti.com/index.php/AM335x_SYSBIOS_Industrial_SDK_01.00.00.06_User_Guide#Building_Bootloader.C2.A0

5. Set predefined macros as follows. For IDK, include HW_IDK  and remove SPI macro. For ICE, include HW_ICE and SPI.

What are predefined macros and how are they set? I'm using ICE.

Thanks, Ben

  • 0
    TI__Mastermind 21285 points

    Hi Ben,

    This is an example pre-defined macro;

    #define BOARD_ICE335X

    What this does is allows developers to write a single file for use on multiple systems, such as the ICE, EVM, and SKs.  This is done so source code will build specifically for a certain board (usually dev kits).

  • 0 in reply to Michael S
    TI__Mastermind 44306 points

    Maybe the term macro is a bit misleading in that context. Yes, you can define whole 'macros' with a #define.

    But what it is used for here in the context of IA-SDK is conditional computation. Based on #define done or not you will get different code included in the source and therefor a different behavior of the program. This is often used to save lines of code but can get pretty confusing if used excessively.

    #define can be set in files (e.g. header) or in the development environment (compiler options...). In the later case it will be stored in the project file. So if you start a new project don't forget to copy the necessary compiler options from examples.

    Regards.

  • 0 in reply to Frank Walzer
    Prodigy 130 points

    Thanks, but it is still not clear to me exactly what is required here.

    From your description it seems I need to add the following #defines for ICE board:

    #define HW_ICE

    #define SPI

    But which header file do I add them to or which compiler option do I modify in CCS?

  • 0 in reply to Ben Lewis
    Expert 2380 points

    HI Ben,

    If you are using CCS to build the boot loader, you can set the macro in project properties. Steps below to be followed on CCS 5.2.xx are given below

    1. Go to Menu->Project->Properties in CCS
    2. Go to Build->TMS470 Compiler->Advanced Options->Predefined Symbols ( You will see all pre-build macros there and can add/edit/delete it).

    Regards,

    Shahid

  • 0 in reply to Shahid AC
    Prodigy 130 points

    Thanks Shahid, I've got it now.