F28335_PWM使用

// Configure ePWM1
 
 // Setup TBCLK
   EPwm1Regs.TBPRD = EPWM_TIMER_TBPRD;           // Set timer period 1500/2 TBCLKs
   EPwm1Regs.TBPHS.half.TBPHS = 0x0000;           // Phase is 0
   EPwm1Regs.TBCTR = 0x0000;                      // Clear counter

   
   
   // Set Compare values
   EPwm1Regs.CMPA.half.CMPA = EPWM_CMPAB;     // Set compare A value
//   EPwm1Regs.CMPB = EPWM_CMPAB;               // Set Compare B value
   
   // Setup counter mode
   EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up down
   
   EPwm1Regs.TBCTL.bit.PHSEN = TB_ENABLE;        // enable phase loading   use for sync
   EPwm1Regs.TBCTL.bit.PHSDIR=TB_UP;
   EPwm1Regs.TBCTL.bit.SYNCOSEL=TB_SYNC_IN;
   
   EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV2+TB_DIV4+TB_DIV4;       // TBClock ratio = SYSCLKOUT/(2*HSPCLKDIV*
   EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;		//   						2^CLKDIV)

   // Setup shadowing
   EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
//   EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
   EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;  // Load on Zero
 //  EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;   


   // Set actions
   EPwm1Regs.AQCTLA.bit.CAU = AQ_SET;             // Set PWM1A on event A, up count
   EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;           // Clear PWM1A on event A, down count

  // EPwm1Regs.AQCTLB.bit.CAU = AQ_CLEAR;             //Clear  PWM1B on event A, up count
  // EPwm1Regs.AQCTLB.bit.CAD = AQ_SET;           //  Set PWM1B on event A, down count

   // Set DeadBand
   EPwm1Regs.DBCTL.bit.IN_MODE=DBA_ALL;
   EPwm1Regs.DBCTL.bit.POLSEL=DB_ACTV_HIC;
   EPwm1Regs.DBCTL.bit.OUT_MODE=DB_FULL_ENABLE;
   EPwm1Regs.DBRED=Dbred;						// Dead-band rising edge delay
   EPwm1Regs.DBFED=Dbfed;						// Dead-band falling edge delay

   // Set Trip Zone
   EPwm1Regs.TZSEL.bit.OSHT1=TZ_ENABLE;
   EPwm1Regs.TZCTL.bit.TZA=TZ_FORCE_LO;
   EPwm1Regs.TZCTL.bit.TZB=TZ_FORCE_LO;

   
   // Interrupt where we will change the Compare Values
   EPwm1Regs.ETSEL.bit.SOCBSEL= ET_CTR_ZERO;      // Select start ADC (EPWMxSOCB) on Zero event
   EPwm1Regs.ETSEL.bit.SOCBEN= Enable;                 // Enable  
   EPwm1Regs.ETPS.bit.SOCBPRD=ET_1ST;

主要注意的就是EPWM的死區子模塊。由比較器產生A，B個比較信號進入動作限定子模塊，並且出來EPWMxA（1）與EPWMxB（1）兩路信號，然後進入死區模塊。對於死區模塊是雙輸入雙輸出的，輸入爲EPWMxA（1）與EPWMxB（1），輸出爲EPWMxA（2）與EPWMxB（2），其中（2）的信號可以由（1）的其中一個或者兩個共同產生。對於我的使用時爲了產生SVPWM去控制IPM，因此需要互補信號，只要用EPWMxA（1）去產生EPWMxA（2）與EPWMxB（2）。