Compiler/TMS320F28379D: Enable and disable some ePWMs

lio messi

Part Number: TMS320F28379D

Tool/software: TI C/C++ Compiler

Hi community.

I want to disable/enable the ePWM1,2, and 3 during the debug (for example by changing a variable from 1 to 0 or vice versa). In other words, I am using bead-band for these ePWMs. But at the beginning of running my code, I want them not to send any gating signal to my switches (i.e., ePWM1,2, and 3 be disabled).

How can I do this in a simple way?

regards

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52040 points

Hmmm,

You want a software variable that can enable and disable all your PWM when written to?

Not a GPIO, that is fed back into the device and used as the DC Trip source, until cleared, putting all ePWMs outputs to LOW?

Nima

0 lio messi over 5 years ago in reply to Nima Eskandari

Expert 1185 points

Thanks for reply

Not exactly! I want SOME of my pwms to be disabled until I enable them by changing a variable in debug windows.

I don't know about a "dc enable gpio"

Is it possible to put SOME of the epwm to zero using a gpio?

Regards

0 Nima Eskandari over 5 years ago in reply to lio messi

TI__Guru 52040 points

Why dont you just change the TB counter mode to FREEZE in the debug window?

Nima

0 lio messi over 5 years ago in reply to Nima Eskandari

Expert 1185 points

How can I do that? Does it works for stopping for example ePWM 1 only while ePWM6 is running?

Regards

0 Nima Eskandari over 5 years ago in reply to lio messi

TI__Guru 52040 points

You can stop any of the EPWMs you want. The bit inside the TBCTL register called CTRMODE is available inside every EPWM, you can set any PWM you want to stop to 0x3 (0b11) to stop the TBCTR from counting. In CCS you can open the "Registers" view and stop any PWM you want by switching this register in that PWM's registers.

0 lio messi over 5 years ago in reply to Nima Eskandari

Expert 1185 points

Hi Nima,

Thanks for the reply. Is it possible to be done through the software code? I mean, at the time I run my code in the debug windows, some PWMs do not work (as you said, CTRMODE=3 for them) after a while and when I want to start the switching of the power inverter, I change a variable in the expression windows and PWM 1,2, and 3 start working together right at that time.

Another question is if I set CTRMODE=3 for ePWM 1, then what happens to those ePWMs which are synchronous to this ePWM through SYNCSELECT? Can they work while the ePWM1 is stopped working?

Best regards

0 Nima Eskandari over 5 years ago in reply to lio messi

TI__Guru 52040 points

If you stop epwm1 and other epwms are dependent on epwm1 to sync, the other epwms will continue to run. They just won’t receive a sync signal from the disabled epwm1.

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Compiler/TMS320F28379D: Enable and disable some ePWMs