dsPIC33EP64MC502 PWM无输出

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anstxfw|

楼主 | 2015-12-29 11:38 | 只看该作者回帖奖励

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dspic33, PWM, tc, PTC, se

dsPIC33EP64MC502 PWM无输出
void PWM_Init(void)
{
PTCONbits.PTEN=0;
PTCONbits.PTSIDL=0;
PTCONbits.SESTAT=0;
PTCONbits.SEIEN=0;
PTCONbits.EIPU=0;
PTCONbits.SYNCPOL=0;
PTCONbits.SYNCOEN=0;
PTCONbits.SYNCEN=0;
PTCONbits.SYNCSRC=1;
PTCONbits.SEVTPS=0;
/* 1:1 Prescaler */
PTCON2bits.PCLKDIV=0;    //120M
/* PTPER provides the PWM time period value */
PWMCON1bits.ITB=0;

PWMCON1bits.MDCS=0;    //set PDCX as pwm duty
PWMCON1bits.DTC=2;    //disable Dead Zone
PWMCON1bits.CAM=0;    //Edge-Aligned mode

IOCON1bits.PENH=1;    //PWM LOCK DISENABLE
IOCON1bits.PENL=1;    //
IOCON1bits.SWAP=0;

/* Set PWM Period on Primary Time Base */
PTPER = 6000;             //20khz    120M/20K=6000
/* Set Phase Shift */
PHASE1 = 0;
/* Set Duty Cycles */
PDC1 = 3000;                //120M/20K*DUTY=6000*(0~1);

ANSELB = 0;
TRISBbits.TRISB14 = 0;
TRISBbits.TRISB15 = 0;                   //PWMH PWML as output

/* Enable PWM Module */
PTCONbits.PTEN=1;

}
用示波器测量PWM1H与PWM1L均无波形。请帮忙看下，不胜感激！

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