TMS570LS Static variables not initializate are allocated in flash

Davide Battistoli

I declare the variable 'pippo_tmp' as static type inside the function 'void rti_UpdateTimer (void)', 'pippo_tmp' is not initialized. I don't understand why it is allocated in the flash at 0x000861C and not in RAM. If I initialize the variable, everything works. What linker/compiler settings should I make?

I attached the screenshot.

over 9 years ago

0 Sunil Oak over 9 years ago

TI__Mastermind 49120 points

Davide,

I will move your post to the Compilers team for their comment.

Regards, Sunil

0 Archaeologist over 9 years ago

TI__Guru* 84225 points

If the variable pippo_tmp is set but its value is not used, it might have been removed by the compiler.

0 Davide Battistoli over 9 years ago in reply to Archaeologist

Intellectual 400 points

I assigned 'pippo_tmp' to 'counter_led', 'counter_led' is correctly incremented by 2, but I do not understand why the value of 'pippo_tmp' remains fixed with 0xE92D400E address 0x0000861C. At 0x000861C is the value 0xE92D400E see 'Memory Browser'. In addition, why the static variables that are not explicitly initialized are not set to 0 ?

In following screenshot, you can see the 'Memory Browser'

0 Archaeologist over 9 years ago in reply to Davide Battistoli

TI__Guru* 84225 points

I'll need to see more of the disassembly to analyze this issue. Could you post the disassembly for the entire function, or perhaps the compiler-generated assembly file?

0 Chester Gillon over 9 years ago in reply to Davide Battistoli

Guru 92251 points

Davide Battistoli said:
I assigned 'pippo_tmp' to 'counter_led', 'counter_led' is correctly incremented by 2, but I do not understand why the value of 'pippo_tmp' remains fixed with 0xE92D400E address 0x0000861C. At 0x000861C is the value 0xE92D400E see 'Memory Browser'. In addition, why the static variables that are not explicitly initialized are not set to 0

I think you may be encountering the problem described in http://e2e.ti.com/support/development_tools/compiler/f/343/t/335888.aspx. That problem means the generated code is correct, but compiler gives the incorrect address of static variables to the debugger. Try the work-around in the referenced thread of to build with --common=off

0 Davide Battistoli over 9 years ago in reply to Chester Gillon

Intellectual 400 points

I'm using ARM compiler v5.1.8, therefore the problem is still open. The work-around with --common=off is correct, now the debugger shows all the variables with an address in RAM.

Thank you very much for your support.

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TMS570LS Static variables not initializate are allocated in flash