Part Number: TMS320F28069 Tool/software: Hi expert, Using F28069, we found when the duty cycle changes from non-0% to 0%, the EPWM4B output high lever for 1 PWM cycle. What could be the potential issue? Configuration: configure the PWM switching period to 38.4K, trigger the PWM interrupt at the zero-crossing point, and configure the PWM interrupt to be triggered once every 2 PWM zero crossing events (EPwm4Regs.ETPS.bit.INTPRD = 2). Execute the control algorithm in the interrupt function and change the PWM comparison value. Here is the configuration code: EPwm4Regs.CMPCTL.bit.SHDWAMODE = 0; // Compare A Register Shadow mode EPwm4Regs.CMPCTL.bit.SHDWBMODE = 0; // Compare B Register Shadow mode EPwm4Regs.CMPCTL.bit.LOADAMODE = 0; // Load on CTR = ZERO EPwm4Regs.CMPCTL.bit.LOADBMODE = 0; // Load on CTR = ZERO EPwm4Regs.AQCTLA.all = 0; EPwm4Regs.AQCTLB.all = 0; EPwm4Regs.AQCTLA.bit.CAU = 2; EPwm4Regs.AQCTLA.bit.CAD = 1; EPwm4Regs.AQCTLA.bit.PRD = 2; EPwm4Regs.AQCTLA.bit.ZRO = 1; EPwm4Regs.AQCTLB.bit.CAU = 2; EPwm4Regs.AQCTLB.bit.CAD = 1; EPwm4Regs.AQCTLB.bit.PRD = 2; EPwm4Regs.AQCTLB.bit.ZRO = 1; EPwm4Regs.ETSEL.bit.INTEN = 1; // Enable EPWMxINT generation EPwm4Regs.ETSEL.bit.INTSEL = 1; // Enable CTR = zero event EPwm4Regs.ETSEL.bit.SOCAEN = 1; // Enable SOCA pulse EPwm4Regs.ETSEL.bit.SOCASEL = 3; // Enable CTR = zero event EPwm4Regs.ETPS.bit.INTPRD = 2; // generate interrupt on INTCNT=01(first event) trigger 1 interrupt every 2 cross zero events EPwm4Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on SOCACNT=01(first event) Please help with some suggestions, thanks! Joyce
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