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TMS320F28379D: EPWM TBCTR initial value

Jordan Zhou
Genius 9790 points
Part Number: TMS320F28379D

Hi,

Today I tried F28379D demo code "epwm_updown_aq". Inside I did few changes on ePWM1 and ePWM2. Others are kept the same as demo.

1) Set ePWM1.TBCTR=1000. ePWM2 TBCTR is kept as 0.

2) Set ePWM1 and ePWM2 the same period (1000), CMPA (500), CMPB (800).

3) Set ePWM1 and ePWM2 the same AQ for CAU=set, CAD=set, PRD=clear.

From the oscilloscope, I found that the phase between ePWM1 and ePWM2 were not 1000 clocks.

But, if Set ePWM1.TBCTR=1001. ePWM2.TBCTR=1; the phase was exactly 1000 clocks.

What's the possible issue?

Thanks a lot.

Br, Jordan