LAUNCHXL-F280049C: EPWM Synchronization

Abdul Basit

Prodigy 45 points

Part Number: LAUNCHXL-F280049C
Other Parts Discussed in Thread: SYSCONFIG

Hi,

I am using syscfg to generate PWMs. I want to start all the PWM channels at the same point with no phase shift.

But I am getting this output

My Syscfg sittings are as below

Basit

over 3 years ago

+1 Nima Eskandari over 3 years ago

TI__Guru 52020 points

Your SysConfig setup is correct. How are you handling the TBCLKSYNC register?

That register GATES the clock of the EPWMs, so you want to have it disabled, then setup all EPWMs (using syscofnig - EPWM_init()) then enable the TBCLKSYNC. that way they will all be PERFECTLY Aligned.

Nima

+1 Nima Eskandari over 3 years ago in reply to Nima Eskandari

TI__Guru 52020 points

So for your main.c file, you want to have:

SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

Board_init(); //this calls EPWM_init

SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

0 Nima Eskandari over 3 years ago in reply to Nima Eskandari

TI__Guru 52020 points

Does this make sense?

0 Abdul Basit over 3 years ago in reply to Nima Eskandari

Prodigy 45 points

Hi Nima,

Thank you it has resolved my issue.

BR,

Basit

0 Nima Eskandari over 3 years ago in reply to Abdul Basit

TI__Guru 52020 points

Basit, I have a quick question for you. How did you like the EPWM SysConfig GUI?

0 Abdul Basit over 3 years ago in reply to Nima Eskandari

Prodigy 45 points

I think the EPWM SysConfig GUI is very user-friendly for beginners, but one still has to rely on some of the EPWM functions in main() to make it fully work.

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LAUNCHXL-F280049C: EPWM Synchronization