CCS/TMS320F28377D: # ePWM

Tool/software: Code Composer Studio

HI everyone,

       I  use 28377D to generate the PWM waves,and each phase has 4 pwms。EPWM1 is the master and EPWM2~EPWM6 are slave. Phase A uses EPWM1 and EPWM2, Phase B uses EPWM3 and EPWM4.Phase C uses EPWM4 and EPWM5.      

       The phenomenon is very odd,Phase B and Phase C  can generate normal waves,but the wave which is generated  from phase A has some large overshoot,The overshoot don't  often appear and it  will be consecutively when it appears.

        So i doubt that it relate with EPWM1 and EPWM2。Perhaps some registers don't be configured properly.

My register configuration is following.

Initial part:

void PWMchUpDwnCntConfig(int16 n,int16 mode, int16 phase)
{

(*ePWM[n]).TBCTL.bit.HSPCLKDIV = 1;
(*ePWM[n]).TBCTL.bit.CLKDIV = 1;
(*ePWM[n]).TBCTL.bit.PRDLD = TB_SHADOW;
(*ePWM[n]).TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;
(*ePWM[n]).TBCTL.bit.HSPCLKDIV = TB_DIV1;
(*ePWM[n]).TBCTL.bit.CLKDIV = TB_DIV1;

if (mode == 1) // config as a Master
{
(*ePWM[n]).TBCTL.bit.PHSEN = TB_DISABLE;
(*ePWM[n]).TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;
}
else if (mode == 0) // config as a Slave
{
(*ePWM[n]).TBCTL.bit.PHSEN = TB_ENABLE;
(*ePWM[n]).TBCTL.bit.SYNCOSEL = TB_SYNC_IN;
(*ePWM[n]).TBCTL.bit.PHSDIR = TB_UP;
}

if(n % 2 == 0)
{
(*ePWM[n]).TBCTR = 0;
(*ePWM[n]).TBPHS.bit.TBPHS = 0;
(*ePWM[n]).TBPRD = 3200;
(*ePWM[n]).CMPCTL.bit.SHDWAMODE = CC_SHADOW;
(*ePWM[n]).CMPCTL.bit.SHDWBMODE = CC_SHADOW;
(*ePWM[n]).CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
(*ePWM[n]).CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
}
else
{
(*ePWM[n]).TBCTR = 0;
(*ePWM[n]).TBPHS.bit.TBPHS = 3200;
(*ePWM[n]).TBPRD = 6400;
(*ePWM[n]).CMPCTL.bit.SHDWAMODE = CC_SHADOW;
(*ePWM[n]).CMPCTL.bit.SHDWBMODE = CC_SHADOW;
(*ePWM[n]).CMPCTL.bit.LOADAMODE = CC_CTR_PRD;
(*ePWM[n]).CMPCTL.bit.LOADBMODE = CC_CTR_PRD;
}

(*ePWM[n]).CMPA.bit.CMPA = 0;

(*ePWM[n]).AQCTLA.bit.CAU = AQ_CLEAR;
(*ePWM[n]).AQCTLA.bit.CAD = AQ_SET;
(*ePWM[n]).AQCTLA.bit.CBU = AQ_NO_ACTION;
(*ePWM[n]).AQCTLA.bit.CBD = AQ_NO_ACTION;
(*ePWM[n]).AQCTLA.bit.PRD = AQ_NO_ACTION;
(*ePWM[n]).AQCTLA.bit.ZRO = AQ_NO_ACTION;

(*ePWM[n]).AQCTLB.bit.CAU = AQ_CLEAR;
(*ePWM[n]).AQCTLB.bit.CAD = AQ_SET;
(*ePWM[n]).AQCTLB.bit.CBU = AQ_NO_ACTION;
(*ePWM[n]).AQCTLB.bit.CBD = AQ_NO_ACTION;
(*ePWM[n]).AQCTLB.bit.PRD = AQ_NO_ACTION;
(*ePWM[n]).AQCTLB.bit.ZRO = AQ_NO_ACTION;

(*ePWM[n]).DBCTL.bit.OUT_MODE = DB_FULL_ENABLE;
(*ePWM[n]).DBCTL.bit.POLSEL = DB_ACTV_HIC;
(*ePWM[n]).DBCTL.bit.IN_MODE = DBA_RED_DBB_FED;
(*ePWM[n]).DBRED.bit.DBRED = DB_RISING_EDGE_DELAY;
(*ePWM[n]).DBFED.bit.DBFED = DB_FALLING_EDGE_DELAY;
}

PWMchUpDwnCntConfig(0,1,0);//EPWM1 is master
PWMchUpDwnCntConfig(1,0,0);
PWMchUpDwnCntConfig(2,0,0);
PWMchUpDwnCntConfig(3,0,0);
PWMchUpDwnCntConfig(4,0,0);
PWMchUpDwnCntConfig(5,0,0);

when the timer interrupt  appears,EPWM(1~6) will update the CMPA.

Can you give some advices?Thank you!