Таким образом настраиваю ШИМ (EPWM1 отвечает за импульсы низкой частоты, а EPWM2 за формирование синусоиды):
Код:
EPwm1Regs.TBPRD = 4000;
EPwm1Regs.CMPA.bit.CMPA = 2000; // Set 50% fixed duty for EPWM1A
EPwm1Regs.TBPHS.bit.TBPHS = 0; // Set Phase register to zero
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Asymmetrical mode
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Master module
EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; // Sync down-stream module
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV4; // TBCLK = SYSCLK
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV4;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm1Regs.AQCTLA.bit.ZRO = AQ_SET; // set actions for EPWM1A
EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR;
EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
EPwm1Regs.DBFED.bit.DBFED = 50; // FED = 50 TBCLKs initially
EPwm1Regs.DBRED.bit.DBRED = 70; // RED = 70 TBCLKs initially
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_PRD;
EPwm1Regs.ETSEL.bit.INTEN = 1;
EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;
// EPWM Module 2 config
EPwm2Regs.TBPRD = PERIOD;
EPwm2Regs.CMPA.bit.CMPA = 500; // Set 50% fixed duty EPWM2A
EPwm2Regs.CMPB.bit.CMPB = 500; // Set 50% fixed duty EPWM2A
EPwm2Regs.TBPHS.bit.TBPHS = 0; // Set Phase register to zero initially
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Asymmetrical mode
EPwm2Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Slave module
EPwm2Regs.TBCTL.bit.PRDLD = TB_SHADOW;
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_IN; // sync flow-through
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm2Regs.AQCTLA.bit.ZRO = AQ_SET; // set actions for EPWM2A
EPwm2Regs.AQCTLA.bit.CAU = AQ_CLEAR;
EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
EPwm2Regs.DBFED.bit.DBFED = 50; // FED = 50 TBCLKs initially
EPwm2Regs.DBRED.bit.DBRED = 70; // RED = 70 TBCLKs initially
EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;
EPwm2Regs.ETSEL.bit.INTEN = 1;
EPwm2Regs.ETPS.bit.INTPRD = ET_1ST;
EDIS;
В прерывании EPWM2 от забрасываются значение из таблицы синусов в CMPA или CMPB. В прерывании от EPWM1 включаются и исключаются последовательно CMPA и CMPB модуля EPWM2.