HI.
I use 28335 DSP for 3-level inverter application and now I have trouble with PWM out put signal..
In my system I use epwm interrupt routine for control(main control program is in this routine).
The problam is that an error PWM pulse is generated at the PWM signal output,
it looks like the refernce is changed from low level to high level just in a sample period(20kHz).
Fig 1, Fig 2 show that the experimental phenomenon.
Figure 01
Figure 02
In Figure02
Green : control period(20kHz)-interrupt period
Brown : S1(top switch) PWM signal (in Figure 01, green)
Red : S2(middle switch) PWM signal