CCS/TMS320F28377S: Code execution time

Milarepa

Part Number: TMS320F28377S
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Hi,

My code is behaving erratically after sometime from start. The code is slightly long with many calculations. I want to check the code execution time for the code written inside the ISR. I am toggling GPIO64 at the start and end of ISR as:

GpioDataRegs.GPCTOGGLE.bit.GPIO64 = 1; // GPIO64 for loop execution time

I have also done the settings for GPIO as:

void GpioSelect(void)
{
EALLOW;
GpioCtrlRegs.GPCGMUX1.bit.GPIO64 = 00; // Selecting pin function as GPIO64
GpioCtrlRegs.GPCMUX1.bit.GPIO64 = 00; // Selecting pin function as GPIO64
GpioCtrlRegs.GPCDIR.bit.GPIO64 = 1; // GPIO64 as output
GpioDataRegs.GPCCLEAR.bit.GPIO64 = 1; // GPIO64 value initialize
EDIS;
}

Is this ok?

Regards

over 7 years ago

0 Rajaravi Krishna Katta over 7 years ago

TI__Expert 6795 points

Hi Shyam,

You need to add

GpioCtrlRegs.GPCPUD.bit.GPIO64 = 0; // Enable pullup on GPIO64

to the sequence. Make sure you call InitGpio() in your init code.

For more information refer to example at "C:\ti\c2000\C2000Ware_1_00_03_00\device_support\f2837xs\examples\cpu1\gpio_setup"

Please let me know if you face an issue.

Thanks,
Katta

0 Milarepa over 7 years ago in reply to Rajaravi Krishna Katta

Expert 1680 points

I added that inside GpioSelect(). I am calling the function at the start. Is that fine.

0 Rajaravi Krishna Katta over 7 years ago in reply to Milarepa

TI__Expert 6795 points

Hi Shyam,

Yes it is fine. As I told earlier please make sure InitGpio is called before calling this function.

Thanks,
Katta

0 Milarepa over 7 years ago in reply to Milarepa

Expert 1680 points

0 Milarepa over 7 years ago in reply to Milarepa

Expert 1680 points

This is the loop exec time by toggling the gpio. Is there any reason why exec time has to vary other than conditional statements. I haven't added initgpio(). Is that required.

0 Rajaravi Krishna Katta over 7 years ago in reply to Milarepa

TI__Expert 6795 points

Hi Shyam,

Are you referring to the place marked in red in the diagram?

Can you please mark the diagram where you see the erratic behavior and mention what is expected?

Can you please share more details or share the code to show where you are toggling GPIO?

Thanks,

Katta

0 Milarepa over 7 years ago in reply to Rajaravi Krishna Katta

Expert 1680 points

Yes, i am referring to the circled (in red) area. High time is the code (inside ISR) exec time. I expect a pulsed waveform without this jittering.

0 Rajaravi Krishna Katta over 7 years ago in reply to Milarepa

TI__Expert 6795 points

Hi Shyam,

Could you share the code? I want to check if there is a possibility with occuring multiple toggles at the circled area.
Have you tried with a simple GPIO toggle example to see if the behaviour is similar?

Thanks,
Katta

0 Rajaravi Krishna Katta over 7 years ago in reply to Rajaravi Krishna Katta

TI__Expert 6795 points

Hi Shyam,

I haven’t heard from you for one week, so I’m assuming you were able to resolve your issue. If this isn’t the case please reply to this thread. If this thread locks, please make a new thread describing the current status of your issue.

Thanks,
Katta

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CCS/TMS320F28377S: Code execution time