TMS320F280025C: Connect CLB output to TripZone input on an ePWM module and force all outputs to 0

Henry Jacobs

Part Number: TMS320F280025C
Other Parts Discussed in Thread: C2000WARE

I'm looking for the best way to connect a CLB output to the TripZone of an ePWM module.
This is some sample code that has not been tested:
void Init_Trigger_shutdown
(
uint32_t base,
XBAR_TripNum trip,
XBAR_EPWMMuxConfig muxConfig,
uint32_t muxes
)
{

XBAR_setEPWMMuxConfig (trip, muxConfig);
XBAR_enableEPWMMux (trip, muxes);

EPWM_setTripZoneAction (base, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW); // ZCD forces early termination
EPWM_setTripZoneAction (base, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW); // ZCD forces early termination
};

and a call:

Init_Trigger_shutdown (
EPWM3_BASE,
XBAR_TRIP7,
XBAR_EPWM_MUX05_CLB2_OUT4,
XBAR_MUX05
);

Do I need to use OUTPUTS 4 or 5 from the CLB to the ePWM?
What about using TZ1-3 instead of TRIP7?
How do I tie the TRIP signal to the TripZoneAction?
My intent is to have the CLB signal the ePWM modules and set all of the outputs to 0.
Is there a better method?

over 4 years ago

0 Nima Eskandari over 4 years ago

TI__Guru 52060 points

EPWM XBAR can use CLB_OUT4 and CLB_OUT5 of CLB1 and CLB2.

In the EPWM tripzone module, you can use TRIP4 and TRIP5.

In the Digital compare module you can use the TRIP7 and up.

You configure the EPWM XBAR TRIPx (x= one of trips mentioned above) to use CLB OUT.

Then depending on the TRIP selected, configure TZ or DC module accordingly.

Nima

0 Henry Jacobs over 4 years ago in reply to Nima Eskandari

Prodigy 70 points

I'm a novice with this processor and don't understand your reply.

How do I find the proper API calls for each module that you reference?

0 Nima Eskandari over 4 years ago in reply to Henry Jacobs

TI__Guru 52060 points

Henry,

Have you:

1. Reviewed the TRM for the XBAR, CLB and EPWM chapters?

2. Reviewed the EPWM driverlib examples in C2000Ware?

3. Reviewed the CLB driverlib examples in C2000Ware?

Nima

0 Henry Jacobs over 4 years ago in reply to Nima Eskandari

Prodigy 70 points

Yes, of course.

0 Nima Eskandari over 4 years ago in reply to Henry Jacobs

TI__Guru 52060 points

So you need to call:

XBAR_setEPWMMuxConfig (trip, muxConfig);

where the trip is the TRIP number, and the muxConfig is the CLBx_OUT4/5.

Then pick whether this trip is a CBC or OST. Lets say you pick OST:

EPWM_enableTripZoneSignals(uint32_t base, uint16_t tzSignal)

Then you set the action:

EPWM_setTripZoneAction (base, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_);

0 Henry Jacobs over 4 years ago in reply to Nima Eskandari

Prodigy 70 points

Thanks,

This appears to be what I found, but haven't tested yet:

Init_Trigger_shutdown (
EPWM3_BASE,
XBAR_TRIP4,
XBAR_EPWM_MUX05_CLB2_OUT4,
XBAR_MUX05
);

void Init_Trigger_shutdown
(
uint32_t base,
XBAR_TripNum trip,
XBAR_EPWMMuxConfig muxConfig,
uint32_t muxes
)
{
XBAR_setEPWMMuxConfig (trip, muxConfig); //e.g.(XBAR_TRIP4, XBAR_EPWM_MUX05_CLB2_OUT4)
XBAR_enableEPWMMux (trip, muxes); // e.g. (XBAR_TRIP4, XBAR_MUX05);
EPWM_enableTripZoneSignals(base, EPWM_TZ_SIGNAL_CBC4); // Cycle-by-Cycle TRIP4
EPWM_setTripZoneAction (base, EPWM_TZ_ACTION_EVENT_TZA, EPWM_TZ_ACTION_LOW); // ePWMA = 0
EPWM_setTripZoneAction (base, EPWM_TZ_ACTION_EVENT_TZB, EPWM_TZ_ACTION_LOW); // ePWMB = 0
EPWM_selectCycleByCycleTripZoneClearEvent(base, EPWM_TZ_CBC_PULSE_CLR_CNTR_ZERO); // clear when counter = 0
};

0 Henry Jacobs over 4 years ago in reply to Henry Jacobs

Prodigy 70 points

I am running out of resources and had to use CLB OUT4 and OUT5 for another purpose. I tried connecting the CLB to the ePWM using TRIP7 but the ePWM is already connected to the CLB with another TRIP and I cannot figure out how to handle the individual TRIP events. My thought is to use TZ1instead of TRIP7, but it seems to require connecting to the INPUT X-BAR and I do not have a GPIO that I can use to connect to the CLB OUTPUT X-BAR. Another idea is to generate an interrupt on each trip event, but this may slow down things too much.

0 Nima Eskandari over 4 years ago in reply to Henry Jacobs

TI__Guru 52060 points

You could override the EPWM output through the CLB OUT override feature. If you are not using HRPWM, and are using a EPWM1 or EPWM2, this can be done.

0 Henry Jacobs over 4 years ago in reply to Nima Eskandari

Prodigy 70 points

I found an unused GPIO pin and use it to generate an interrupt. The ISR then sets desired signals to 0. Tis works except the ISR latency is noticeable (650 ns). Thanks for the ideas.

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TMS320F280025C: Connect CLB output to TripZone input on an ePWM module and force all outputs to 0