Dear team:
One of my client want to generate PWM waveform as show in the below picture:
He hopes:
The AQCTLA register sets epwmA high when the time base count value is 0, and sets epwmA low when the time base count value is CMPA;
The AQCTLB register sets epwmB high when the time base count value is PRD, and sets epwmB low when the time base count value is CMPB.
But in the end, a PWM wave with the same frequency and duty cycle and the same phase is generated as shown in below picture:
May I ask what is wrong with this setting? Below is his code:
Initialization part:
EPwm1Regs.TBPRD = p->PERIOD; EPwm1Regs.TBPHS.all = 0; EPwm1Regs.TBCTR = 0x0000; EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; //递增递减计数模式 EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; //禁止TBPHS加载到TBCTR EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; EPwm1Regs.EPWMSYNCINSEL.all = 0; EPwm1Regs.EPWMSYNCOUTEN.all = 0; EPwm1Regs.TBCTL2.bit.OSHTSYNCMODE = 0; EPwm1Regs.TBCTL.bit.CLKDIV = 0; //时间基准时钟预分频位 EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0; //高速时间基准时钟预分频位 EPwm1Regs.TBCTL.bit.FREE_SOFT = 11; EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; EPwm1Regs.AQCTL.bit.SHDWAQAMODE = 0; EPwm1Regs.AQCTL.bit.SHDWAQBMODE = 0; EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET; EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; EPwm1Regs.AQCTLB.bit.PRD = AQ_SET; EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; /*====================================================================*/ EPwm1Regs.CMPA.bit.CMPA = p->CMPRA; EPwm1Regs.CMPB.bit.CMPB = p->CMPRB; /*====================================================================*/ EALLOW; CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS;
PWM sitting:
EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET; EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; EPwm1Regs.AQCTLB.bit.PRD = AQ_SET; EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR; EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm1Regs.DBFED.all = 100; EPwm1Regs.DBRED.all = 100; EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HI; EPwm1Regs.AQCSFRC.bit.CSFA = 0; EPwm1Regs.AQCSFRC.bit.CSFB = 0;
Best regards