PMP23340UCD: Questions about interrupts and softstart

Hi，

Thank u for ur time.

I have some doubts about PMP23340UCD.

      Hardware：PMP23340UCD(UCD3138A) 
      Firmware：TI supplied routines——UCDIBCFirmware 

I'm a bit confused about the software startup, my initial understanding is that the background loop after the program runs handles the PMBus communication, and the interrupt loop handles the time-critical tasks (measuring ADC inputs, controlling the state machine, error handling).

Issues：

1. Configure IRQ in init_interrupt(), but did not find the dpwm2 interrupt enable.
2. Can you explain the transition conditions for the different states in standard_interrupt() and the handle function function?
3. My understanding: after the program starts and goes through a ramp start, the state stays in regulation if there are no error conditions, right?

Best Regards.