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Discussion Groups | TMS320C3x | global variable not accessible!
Technical discussions about the TI C3x DSPs (including the C31, C32 and C33 DSPs).
global variable not accessible! - Saqib Ali - Nov 11 21:58:00 2002
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hi i have been coding on the code composer in the emulator . my project contains 4 source files . i have a global variable in teh file containong main ... but when i try to access it through the sub routine which is present in the other file , in which the global variable is refrenced as extern , it dont take the value , i have enabled teh file-level optimization in te compiler options ... anybody have any idea ? Saqib |
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Re: global variable not accessible! - Keith E. Larson - Nov 12 14:54:00 2002
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Hello Saqib 1- Global variables are typicaly loaded using direct addressing. Make sure the DP register is correct or has not been corrupted 2- Have you linked the correct RTS libraries. Mixing large/small memory models and or libraries with the non-matching register passing can lead to side effects. 3- You did not say exactly what was not working, but if this involves a math function other than the base add/sub/mpy functions (EG handled in hardware), you might need to add #inclide <math.h> to the top of your file. This compiler does not report missing prototype functions (an interesting loop-hool in the old ANSI-C standards). If no prototype is known, the compiler will assume integer input and outputs per the count of the calling function. 4- Tell the linker create a map file for you and make sure the variables storage location looks sensible. Might be reserved or non-existing memory? 5- Open (or relocate) a memory window at that location. You should see the variable name and you should be able to edit the displayed data. Hope this helps, Keith Larson ==================================== At 01:58 PM 11/11/02 -0800, you wrote: >hi > >i have been coding on the code composer in the emulator . my project contains 4 source files . i have a global variable in teh file containong main ... but when i try to access it through the sub routine which is present in the other file , in which the global variable is refrenced as extern , it dont take the value , i have enabled teh file-level optimization in te compiler options ... anybody have any idea ? > >Saqib +-----------------------------------------------+ |Keith Larson | |Member Group Technical Staff | |Texas Instruments Incorporated | | | | 281-274-3288 | | | | www.micro.ti.com/~klarson | |-----------------------------------------------+ | TMS320C3x/C4x/VC33 Applications | | | | TMS320VC33 | | The lowest cost and lowest power 500 µw/Mflop | | floating point DSP on the planet! | +-----------------------------------------------+ |
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