TMS320F280049C: PWM and external IO input at the same frequency Clock synchronization issues

Anka Zhang

Intellectual 2215 points

Part Number: TMS320F280049C
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi expert,

My customer has issue with PWM and input clock frequency, and the suscfg is as below.

Best Regards

Anka

10 months ago

0 Stevan Duraskovic 10 months ago

TI__Expert 5270 points

Hello Anka,

Could you provide more details about the issue, please? What do the waveforms 1,2, and 3 represent and what is customer trying to achieve? Thanks in advance.

0 Anka Zhang 10 months ago in reply to Stevan Duraskovic

TI__Intellectual 2215 points

Hi Stevan,

My client wants the input signal of the GPIO as a synchronization source for the PWM. But the results show that it is out of sync.

Best Regards

Anka Zhang

0 Stevan Duraskovic 10 months ago in reply to Anka Zhang

TI__Expert 5270 points

Hello Anka,

I will take a look and update you. I assume Waveform2 on logic analyzer is GPIO signal?

0 Anka Zhang 10 months ago in reply to Stevan Duraskovic

TI__Intellectual 2215 points

Hi Stevan,

Yes, they are. May I get any reply?

Best Regards

Anka

0 Stevan Duraskovic 10 months ago in reply to Anka Zhang

TI__Expert 5270 points

Hello Anka,

I am sorry for the delayed response. I gave another look at the query, and I found an issue with the PWM configuration. In order to fix this issue, customer would need to enable phase shift load in Sysconfig and set it to value of 2 at least to take into account the synchronization delay. Hope this helps.

Best regards,

Stevan D.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049C: PWM and external IO input at the same frequency Clock synchronization issues