Some Operation is not working in CCS

Vijay Balaji

Hi,

I'm having some issues in CCS (Code Composer Studio IDE).

I was declared a variable and given a value that had not yet been allocated, but after switching off optimisation level and the speed was set to 0, the value was subsequently assigned. I'll be watching in CCS Debug mode.

What is the Optimization Setting?

how to solve the issue?

Regard,

Vijay

over 2 years ago

0 Keith Barkley over 2 years ago

Guru 42145 points

What issue, this sounds normal when optimizing.

0 Martin Imrisek over 2 years ago

TI__Intellectual 1710 points

Hi Vijay,

Can you provide more detail about the issue that you are referring to - I'd like to ensure that we have the right understanding to be able to provide an answer to your question.

Thanks in advance.

0 Ki over 2 years ago

TI__Guru**** 468671 points

Vijay Balaji said:
I was declared a variable and given a value that had not yet been allocated, but after switching off optimisation level and the speed was set to 0, the value was subsequently assigned. I'll be watching in CCS Debug mode.

This is expected behavior when optimization is enabled.

Please see the below document for more details:

https://dev.ti.com/tirex/explore/node?node=A__AEm7LJjS34iFPa5fpT7ttQ__ccs_devtools__FUz-xrs__LATEST

Thanks

0 Vijay Balaji over 2 years ago in reply to Martin Imrisek

Prodigy 130 points

Hi, Everyone

int OLED_1in3_test(void)
{

// 0.Create a new image cache
uint8_t *BlackImage;
uint16_t Imagesize = 1024;

if((BlackImage = (uint16_t *)malloc(Imagesize)) == NULL) {
printf("Failed to apply for black memory...\r\n");
return -1;
}

}

i will call this function in Main Program that time imagesize = 1024 this value is not Store in Imagesize Variable, But I switched off optimization level in Properties and then the value is store in the Variable.

Thanks & Regard

Vijay

0 Vijay Balaji over 2 years ago in reply to Ki

Prodigy 130 points

Thanks Ki

0 Ki over 2 years ago in reply to Vijay Balaji

TI__Guru**** 468671 points

Vijay Balaji said:
i will call this function in Main Program that time imagesize = 1024 this value is not Store in Imagesize Variable, But I switched off optimization level in Properties and then the value is store in the Variable.

When optimization is enabled, it likely stores the value in a register instead of a variable. Hence the variable would be "optimized out". This is common.

As mentioned in the article I referenced in my last post:

Are all variables always available for inspection? Or do some go missing?

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Some Operation is not working in CCS