Hello,
I'm trying to synchronize the timebase of an ePWM module to an external clock. The external clock has a 50% duty cycle, and a 5us period (same period that ePWM timebase is set for). Thus I plan to route the external clock from a GPIO to EXTSYNCIN1 via INPUTXBAR5.
However it's unclear how the SYNCI event is actually detected from EXTSYNCIN1. All the examples I can find of using EXTSYNCIN1 have it connected to the EXTSYNCOUT from another ePWM module (like for syncing two launchpads), which means the EXTSYNCOUT pulse is 8 PLLSYSCLK in duration (I assume the pulse is active high). I also see in the datasheet the minimum sync input pulse width is two ePWM clock periods. Is there a problem if the pulses are much longer (like 2.5us from my external clock)?
Also, is it possible to set things up to the SYNCI event occurs on a falling edge of my external clock? Can I just do that by inverting the GPIO input via its GPxINV register? I'm not sure if that works with the input Xbar....
Regards,
Mike
