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CCS/TMS320F28379D: Connect GPIO on one DSP to another

jiahao niu
Prodigy 100 points

Part Number: TMS320F28379D

Tool/software: Code Composer Studio

Hi,

I am trying to get two DSPs work together and what I did is to use some GPIOs to sync two DSPs. I directly connect GPIOs on one DSP to another, setting them as output/input of 1st/2nd DSP. The problem is, sometimes I lost the synchronization between two DSPs but sometimes they can be synced very well. My question is:

1. Is it ok to directly connect the output GPIO of DSP#1 to the input GPIO of DSP#2?

2. Does EPWM_ISR have strict timing? Will there be something wrong occasionally?

3. To realize 0-100% duty cycle, is it better to set CMPA/B=PRD/ZRO, or use set/clear function in AQ submodule?

Thanks a lot!!