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How to debug memory corruption?

 
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E_Blue



Joined: 13 Apr 2011
Posts: 417

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How to debug memory corruption?
PostPosted: Mon Jul 13, 2015 7:54 am     Reply with quote
I'm having a issue with inside an struct

Code:
struct GPRS{
    short Reset;
    short StartSIM900;
    char  IP_Attemps;
    short ComFromSMS;
    short IDxError;
    char  SMS_Phone[15];
    short ChkError;
    short Responder;
    short MassiveAnswer;
    char Step;
    short ShutGPRS;
    char VectorTypeArray[7];
    char VectorActual;
    short AllVectorsInit;
    char GPRS_Step;
    char Pendientes;
    short UnderBit;
}GPRS_Status;


The variable VectorTypeArray[7] is set to zero one by one every time that a CCP interrupt ends.

The compiler version is 5.025.

I'm using this variable only inside an interrupt routines

I think that can be a issue with the FSR register.

I wonder if there any way to make a breakpoint when a variable change to detect what line of code is messing with this variable.
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Ttelmah



Joined: 11 Mar 2010
Posts: 19540

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PostPosted: Mon Jul 13, 2015 9:10 am     Reply with quote
What processor?.

Generally, there is no simple debugging method to find this.

The compiler/chip does not support bit aligned variables. So you will be wasting bytes as the compiler has to use 2 bits for the first two shorts, then byte/word align (depending on the chip) for the characters.
Better to organise your data so things are easier to align:
Code:

struct GPRS{
    char  SMS_Phone[15];
    char  IP_Attemps;
    char VectorTypeArray[7];
    char GPRS_Step;
    char Pendientes;
    char VectorActual;
    char Step;
    short Reset;
    short StartSIM900;
    short ComFromSMS;
    short IDxError;
    short ChkError;
    short Responder;
    short MassiveAnswer;
    short ShutGPRS;
    short AllVectorsInit;
    short UnderBit;
}GPRS_Status;
E_Blue



Joined: 13 Apr 2011
Posts: 417

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PostPosted: Mon Jul 13, 2015 9:31 am     Reply with quote
The processor is PIC18F67j50.

Thanks for the tip; I tried and get this results.

Before the change

ROM used 37702 RAM used 2614

After the change(reorder shorts)

ROM used 37792 RAM used 2608.

I don't get why use more ROM, I did not change the code. Confused
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