problem with mixed C/assembly code flashing

LOKESHA HLMG

Other Parts Discussed in Thread: TMS320C6748

Processor used - Custom DSP board based on TMS320C6748

CCS version - CCS5.1.1

Problem - problem with mixed C/assembly code

A code has been written using mixed C/assembly for C6748 processor. The code is timed using timer0 interrupt. The ISR has ADC-DAC operations an the application code. During debug mode it performs as desired. However, at some instants the interrupt is not generated properly. This issue is resolved when code is reloaded.

However flashing this code for stand alone operations is having a problem. Even after .bin file is loaded the code is not behaving as desired. But, the same application written in C only is working fine in flash mode.

Please can you suggest .

Regards,

Lokesha

over 9 years ago

0 Titusrathinaraj Stalin over 9 years ago

TI__Guru** 116100 points

Dear Lokesha,
Please make sure that you have not enabled optimization in CCS settings. (disable the optimization)
Also please refer to the following TI E2E post.
e2e.ti.com/.../1186971

0 Shankari G over 9 years ago

TI__Mastermind 43955 points

Hi Lokesha,

1. To narrow down the problem, in custom board, first, create an example program for timer0 interrupt and run it through CCS for many iterations and make sure that the interrupts are generated properly and regularly as expected. ( Do not have any ADC_DAC operations in ISR. Do some simple stuffs in ISR like incrementing counter variable...etc )

2. As a next step, flash that example for stand alone operation and see it behaves as expected and make sure that the interrupts are generated similar to the first step.

3. For case one, repeat the above two steps with just the 'C' program. For case two, repeat the above two steps with mixed C and assembly. Check whether the behaviors and outputs of both the cases are same.

4. If the above three steps went well, atlast, you can include the ADC-DAC in the ISR.

0 LOKESHA HLMG over 9 years ago in reply to Titusrathinaraj Stalin

Prodigy 60 points

Dear Titus,

Thanks for replay. We tried disabling the optimization for the code. Still we are facing the problem. In debug mode the same code is working. But when we flash the same code it is not working.

Thanks

LOKESHA H

0 Shankari G over 9 years ago in reply to LOKESHA HLMG

TI__Mastermind 43955 points

Hi Lokesha,

DId you try the steps I proposed?

0 LOKESHA HLMG over 9 years ago in reply to Shankari G

Prodigy 60 points

Hi Shankari,
thanks for reply. In C only code we don't have problem both in Debug mode and flash mode. We will check your steps for mixed C & assembly today.

regards
LOKESHA H

0 Shankari G over 9 years ago in reply to LOKESHA HLMG

TI__Mastermind 43955 points

Hi Lokesha,

Ok, let us know how it goes for you. revert if any help needed.

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problem with mixed C/assembly code flashing