TMS320F280025: Clear tripZone interrupt flag with OST

Mohamed Hashad

Part Number: TMS320F280025
Other Parts Discussed in Thread: C2000WARE

Hello,

I am using the OST tripzone to drive PWMs LOW in upon trip condition set Through GPIO.

The GPIO is active low I measured it and ensured that initially it is high and goes when the trip condition occurs

I don't know the correct way to clear the interrupt flag, the trip condition occurs and I am using EPWM_clearTripZoneFlag API to clear the OST bit in TZCLR register however in the debugger the bit is not being cleared. Please find photo attached

Here's how I clear the flag in my application

ISR_FUNCTION void INT_PWM_HV_T1T2_TZ_ISR (void)
{
//
// Re-enable the OST Interrupt
//
EPWM_clearTripZoneFlag(PWM_HV_T1T2_BASE, (EPWM_TZ_INTERRUPT | EPWM_TZ_FLAG_OST));
//
// Acknowledge this interrupt to receive more interrupts from group 2
//
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP2);
}

I think the assert condition could be the issue here right?

Please guide me what is correct way to clear the OST flag after the trip condition occures

Thanks

over 2 years ago

0 Santosh Jha over 2 years ago

TI__Guru 50611 points

Hi,

Can you try something like below:

EPWM_clearTripZoneFlag(PWM_HV_T1T2_BASE, EPWM_TZ_FLAG_OST | EPWM_TZ_INTERRUPT | EPWM_TZ_FLAG_DCAEVT1);

0 Mohamed Hashad over 2 years ago in reply to Santosh Jha

Prodigy 90 points

Hi Santosh,

Thanks for your answer. I will try it out

May I ask why adding the EPWM_TZ_FLAG_DCAEVT1 shall help in clearing the OST flag?

how they are related?

thanks in advance for the explanation

0 Santosh Jha over 2 years ago in reply to Mohamed Hashad

TI__Guru 50611 points

I need to look into more details into it. I looked one working example and compared with your implementation. Please try this and let me know. Meanwhile I will look into this tomorrow.

0 Mohamed Hashad over 2 years ago in reply to Santosh Jha

Prodigy 90 points

Hi Santosh,

It is not working.

0 Mohamed Hashad over 2 years ago in reply to Mohamed Hashad

Prodigy 90 points

The OST flag is not being cleared with this command EPWM_clearTripZoneFlag(PWM_HV_T1T2_BASE, EPWM_TZ_FLAG_OST | EPWM_TZ_INTERRUPT | EPWM_TZ_FLAG_DCAEVT1);

0 Santosh Jha over 2 years ago in reply to Mohamed Hashad

TI__Guru 50611 points

Hi Mohamed,

I will try try to recreate the issue and get back to you later today.

Thanks, Santosh

0 Mohamed Hashad over 2 years ago in reply to Santosh Jha

Prodigy 90 points

Hi Santosh,

Thank you so much

Just one more info. in the debugger the OST1 flag bit is set in TZOSFLG register right after enbaling the interrupt via this API EPWM_enableTripZoneInterrupt(PWM_HV_T1T2_BASE, EPWM_TZ_INTERRUPT_OST);

I thought maybe the trip is always, I read the value of the GPIO pin via data= GPIO_readPin(12); >> data equal 1
for me this is okay because I am configuring the pin as floating input

+1 Santosh Jha over 2 years ago in reply to Mohamed Hashad

TI__Guru 50611 points

Hi Mohamad,

I initially thought that you are using One Shot Trip as source for DCAEVT, and that is why I suggested to clear like that. But looks like you are using One Shot trip on TZ1. So, your original code is correct.

I just tested C2000Ware trip-zone example

C:/ti/c2000/C2000Ware_4_02_00_00/driverlib/f28002x/examples/epwm/epwm_ex1_trip_zone.c

It is using GPIO12 as input for Trip. It seams to work fine. The code is exactly what you have.

Can you try this example, and see if it works for?

Also, you should configure GPIO12 as 'pull-up enabled on input'.

Thanks & Regards,

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280025: Clear tripZone interrupt flag with OST