TMS320F28379D: How to use common EPWM ISR and determine which channel triggered it?

Hello,

There are multiple ways to trigger your ISR. It can be done through several IPs: ePWM, CPUTimer, ADC, eCAP. If you plan to use ePWM to trigger your ISR, I suggest using the "master" ePWM. "Master" PWM is one that sends the sync-out signal to other ePWMs. In case your application requires variable frequency, then I suggest using another EPWM channel that will be static, and its purpose is just to trigger the ISR. 

This isn't quite what I am looking for.  

I will have multiple ePWM channels operating independently and triggering an ISR.  I know how to do this part.  I want to use the same ISR to service each, but I want to still be able to determine which triggered the ISR. 

For example,

Interrupt_register(INT_EPWM1, &EPWM_ISR);

Interrupt_register(INT_EPWM2, &EPWM_ISR);

Interrupt_register(INT_EPWM3, &EPWM_ISR);

Hello,

Okay, I understand. Is there a specific reason why you're using the same ISR for 3 different PWMs. If you want to know which PWM triggered the ISR, you should just use 3 different ISRs and make the code the same in each. Otherwise, you'll have to read the PIE flags to see which PWM triggered it.

Hi Stevan,

The ISR will be the same for each, and the logic will be a bit complex and subject to change.  Mainly, if I need to make a change, I don't want to manually change the 6 to 9 ISRs and risk a typo.

The PIE flags do not work (I think), because if for example, EPWM4 triggers the ISR first, but by the time I check the flags, EPWM1 has already set its interrupt flag, so that if I read the IFR register, I will see both EPWM2 and EPWM4 flags and not know which one triggered the ISR.

I was hoping there might be some other HW flag / register / setting that I could look at, such as the interrupt Vector ID if that is accessible.  

I think I have a strategy for doing this via software, but need to try it out.