Part Number: TMS320F28386S
Other Parts Discussed in Thread: SYSCONFIG
Tool/software:
for(j = 1;j < PWM_CH;j++)
{
(*ePWM[j]).TBCTL.bit.PRDLD = TB_SHADOW; // set Shadow load
(*ePWM[j]).TBPRD = 20; // PWM frequency = 1/(2*TBPRD)
(*ePWM[j]).CMPA.bit.CMPA =20 / 2; // set duty 50% initially
(*ePWM[j]).CMPA.bit.CMPAHR = 255; // initialize HRPWM extension
(*ePWM[j]).CMPB.bit.CMPB = 20/ 2; // set duty 50% initially
(*ePWM[j]).CMPB.all |= 1 ;
(*ePWM[j]).TBPHS.all = 0;
(*ePWM[j]).TBCTR = 1;
(*ePWM[j]).TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Select up-down
// count mode
(*ePWM[j]).EPWMSYNCINSEL.all = SYNC_IN_SRC_DISABLE_ALL;
(*ePWM[j]).EPWMSYNCOUTEN.all = SYNC_OUT_SRC_DISABLE_ALL;
(*ePWM[j]).TBCTL.bit.HSPCLKDIV = TB_DIV1;
(*ePWM[j]).TBCTL.bit.CLKDIV = TB_DIV1; // TBCLK = SYSCLKOUT
(*ePWM[j]).TBCTL.bit.FREE_SOFT = 11;
(*ePWM[j]).CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // LOAD CMPA on CTR = 0
(*ePWM[j]).CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
(*ePWM[j]).CMPCTL.bit.SHDWAMODE = CC_SHADOW;
(*ePWM[j]).CMPCTL.bit.SHDWBMODE = CC_SHADOW;
(*ePWM[j]).AQCTLA.bit.CAU = AQ_SET; // PWM toggle high/low
(*ePWM[j]).AQCTLA.bit.CAD = AQ_CLEAR;
(*ePWM[j]).AQCTLB.bit.CBU = AQ_SET; // PWM toggle high/low
(*ePWM[j]).AQCTLB.bit.CBD = AQ_CLEAR;
EALLOW;
(*ePWM[j]).HRCNFG.all = 0x0;
(*ePWM[j]).HRCNFG.bit.EDGMODE = HR_BEP; // MEP control on
// both edges.
(*ePWM[j]).HRCNFG.bit.CTLMODE = HR_CMP; // CMPAHR and TBPRDHR
// HR control.
(*ePWM[j]).HRCNFG.bit.HRLOAD = HR_CTR_ZERO_PRD; // load on CTR = 0
// and CTR = TBPRD
(*ePWM[j]).HRCNFG.bit.EDGMODEB = HR_BEP; // MEP control on
// both edges
(*ePWM[j]).HRCNFG.bit.CTLMODEB = HR_CMP; // CMPBHR and TBPRDHR
// HR control
(*ePWM[j]).HRCNFG.bit.HRLOADB = HR_CTR_PRD; // load on CTR = 0
// and CTR = TBPRD
(*ePWM[j]).HRCNFG.bit.AUTOCONV = 1; // Enable autoconversion for
// HR period
(*ePWM[j]).HRPCTL.bit.TBPHSHRLOADE = 1; // Enable TBPHSHR sync
// (required for updwn
// count HR control)
(*ePWM[j]).HRPCTL.bit.HRPE = 1; // Turn on high-resolution
// period control.
CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Enable TBCLK within
// the EPWM
(*ePWM[j]).TBCTL.bit.SWFSYNC = 1; // Synchronize high
// resolution phase to
// start HR period
EDIS;
}
}
THIS IS THE CODE WHERE WE MADE CHANGES.
OUR AIM: to achieve 2MHz signal .Based on the formula TBPRD =50 should give desired fequency but getting 800KHz.At what TBPRD we will gwt 2 MHz ?Please explain the error we are making.
Regards,
Sayan
