AM2634-Q1: PWM ISR latency issue in Autosar system through CAT 0 interrupt

Phoenix Yin

Part Number: AM2634-Q1

Hi,

I configured CAT 0 interrupt for PWM period match interrupt in Vector Microsar system.

In the ISR, I simply toggle a pin and capture the signal on the scope. There is no any functional code in the ISR, just toggle the pin.

But I could see that sometimes the pin was toggled with a delay, it looks like the ISR was serviced late. see the pic.

The pin should be toggled at the middle of the PWM high level, but the red line show the delay occured.

does anyone has idea of fixing this issue?

Thanks

over 2 years ago

0 Meghavi Tank over 2 years ago

TI__Intellectual 1280 points

Hi,

This doesn't look like a EPWM issue, there can be some issue with the ISR being served. I am assigning it to AUTOSAR expert who will respond to this thread.

Regards,

Meghavi

0 Sunil Kumar M S over 2 years ago in reply to Meghavi Tank

TI__Genius 14190 points

Hi Phoenix,

Any other ISR's will be served along with this? Have you confirmed that this is not logic analyzer issue?

BR,

Sunil

0 Phoenix Yin over 2 years ago in reply to Sunil Kumar M S

Intellectual 295 points

Hi Sunil,

There are other ISR for CAN, OS Count, but those are CAT2 interrupt.

PWM interrupt is only CAT0 ISR, which has highest priority.

Thanks

0 Sunil Kumar M S over 2 years ago in reply to Phoenix Yin

TI__Genius 14190 points

Hi Phoenix,

Can you please provide more details?

Is this issue always observed?
What is the frequency of the issue?
If you change it to CAT2 is behavior same?

BR,

Sunil Kumar M S

Arm-based microcontrollers

Arm-based microcontrollers forum

AM2634-Q1: PWM ISR latency issue in Autosar system through CAT 0 interrupt