TMS320F28388D: Factors affecting execution time while running a code from RAM

Dhanashree Mohite

Part Number: TMS320F28388D
Other Parts Discussed in Thread: C2000WARE

We observed that the ISR is taking a few clock cycles extra for execution in CPU1 (Boot from RAM) in the below scenarios:

1. After adding a few lines of extra code in the initialization part which should not affect the execution time of ISRs.

2. After updating the c2000ware version from 3.02 to 3.03.

In both scenarios, we did not observe many changes in the generated map file. There are few changes related to LS RAM sections used for code, we think it should not impact much on execution time.

Can you please let us know about the factors which affect the execution time while running it from RAM?

over 4 years ago

0 Vivek Singh over 4 years ago

TI__Guru** 115881 points

Hi Dhanashree,

We need to more detail to understand the issue. What is the difference in number of clock cycle and how are you measuring this difference ?

In general execution from LSx RAM can get impacted if same RAM block is shared between CPU and CLA. Is that the case in your application ?

Regards,

Vivek Singh

0 Dhanashree Mohite over 4 years ago in reply to Vivek Singh

Intellectual 380 points

Hi Vivek,

The execution time is increased by 2 clock cycles. We are using the timer to read execution time.

No, the same LSx RAM block is not shared between CPU and CLA in our application.

Thanks,

Dhanashree

0 Vivek Singh over 4 years ago in reply to Dhanashree Mohite

TI__Guru** 115881 points

Hi Dhanashree,

Two cycle variation can get introduced based on timing of interrupt or even the timer value which is profiling the code.

Regards,

Vivek Singh

0 Dhanashree Mohite over 4 years ago in reply to Vivek Singh

Intellectual 380 points

Hi Vivek,

What do you mean by the timing of the interrupt?

Thanks,

Dhanashree

0 Vivek Singh over 4 years ago in reply to Dhanashree Mohite

TI__Guru** 115881 points

When you add some more lines of code, timing of what CPU is executing when interrupt happens may change.

Regards,

Vivek Singh

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TMS320F28388D: Factors affecting execution time while running a code from RAM