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配置28069的PWM为UPDOWN模式,预设值9000,比较值4500,但实测PWM占空比为25%,请专家帮忙看看哪里设置得不对? ============================================= EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;// TB_COUNT_UP; EPwm1Regs.TBPRD = 9000; EPwm1Regs.CMPA.half.CMPA = 4500; // Fix duty at 50% EPwm1Regs.TBPHS.all = 0; EPwm1Regs.TBCTR = 0; EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE;//TB_CTR_ZERO; //used to sync EPWM(n+1) "down-stream" EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; 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.AQCTLA.bit.ZRO = AQ_SET; EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; EPwm1Regs.DBCTL.bit.IN_MODE = DBA_ALL; EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi Complimentary // Dead time setting EPwm1Regs.DBRED = 360;//12; // dummy value for now EPwm1Regs.DBFED = 360;//12; // dummy value for now //TZ EPwm1Regs.TZFRC.bit.OST = 1; EPwm1Regs.TZCTL.bit.TZA = TZ_FORCE_LO ; // EPWMxA will go low EPwm1Regs.TZCTL.bit.TZB = TZ_FORCE_LO ; // EPWMxB will go low EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_PRD;// ET_CTR_ZERO; //ET_CTR_ZERO;ET_CTR_PRD //触发CLA1的ADC任务 EPwm1Regs.ETSEL.bit.INTEN = 1; //使能中断 EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 1st event |
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