Compiler/TMS320F28379D: Garbage value in structure array

ASHRITH RAMESH

Intellectual 365 points

Part Number: TMS320F28379D

Tool/software: TI C/C++ Compiler

Hi,

I have a global structure declared as

struct Data{
int userdata[5];
char name;

};

I have created an object for the structure as : struct Data Mytime , LAinfo ;

When the program runs initially when i print the values of Mytime.userdata[0] , it prints a garbage value of 15528 . This garbage value occurs every time until later on when I initialize the array elements.

This does not seem to be the problem with the other structure objects such as LAinfo.userdata[0] .

Kindly let me know what is causing this garbage value to be stored in only one of the structure variables and not all.

Also, as per general information I believed that global variables are initialized to 0 be default.

Thank you

over 5 years ago

0 Santosh Jha over 5 years ago

TI__Guru 50611 points

Hi Ashrith,

Are you using ROM model or RAM model? Auto-initialization depends on which model you are using. Please take a look at compiler documentation section 3.3.2

https://www.ti.com/lit/ug/spru513p/spru513p.pdf

Also, you can review map file where they are placed.

0 ASHRITH RAMESH over 5 years ago in reply to Santosh Jha

Intellectual 365 points

Santosh,

Thank you for your prompt reply.

I have checked my config settings and realize that I have been using the ROM model. However the attached PDF does not elaborate much on what values the variables are initialized with.

Also Reviewing the MAP file did not give me the location of the variable.

Could you please provide more insight into how I can understand the process taking place.

Thank you

0 Santosh Jha over 5 years ago in reply to ASHRITH RAMESH

TI__Guru 50611 points

Ashrith,

The compiler document (link given in previous post) is good place to start. Please review the various sections being used for initialized and uninitialized global variables. In the mapfile, you can check where your variable is placed. Refer to section 2.3 for details.

0 ASHRITH RAMESH over 5 years ago in reply to Santosh Jha

Intellectual 365 points

I did refer to the above mentioned section . Though it was not clear to me looking at the map file of what/where my structure array is being initialized with, I could over come the garbage value by initializing it with 0 which resolved my problem.

0 Santosh Jha over 5 years ago in reply to ASHRITH RAMESH

TI__Guru 50611 points

Do you have small project which I can try to recreate? If you have a project please upload it.

0 Santosh Jha over 5 years ago in reply to Santosh Jha

TI__Guru 50611 points

Closing the thread due to lack of activity.

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Compiler/TMS320F28379D: Garbage value in structure array