56F807 PWM problem

[dingding]

I need software control pwm output, and each channel works indepently. PWM frequence is 20k. But the pwmval couldn't be loaded, the pwm outputs always 3.3 V no matter how I change pwmval. The initial code as the following:

   PWMA_PMCTL=0x0000;
   PWMA_PMFCTL=0x0055;        //fault protection
   PWMA_PMDISMAP1=0;
   PWMA_PMDISMAP2=0;
   PWMA_PMOUT=0x0000;
   PWMA_PMCCR=0x8000; 
   PWMA_PMCCR|=0x0010;  //所有pwmvalx通道同时访问 

   PWMA_PMDCFG=0x100E;    //0100 0000 0000 1110   edge aligned
   PWMA_PMDEADTM=5;
    PWMA_PWMVAL0=1000;
   PWMA_PWMVAL1=1000;
   PWMA_PWMVAL2=1000;
   PWMA_PWMVAL3=1000;
   PWMA_PWMVAL4=1000;
   PWMA_PWMVAL5=1000;
   PWMA_PWMCM=4000;           //PWM周期20KHZ
    PWMA_PMCTL|=2;  //enable pwm  

I do these on 56F807EVM.

Help will be really appreciated!

[ebiz_ws_prod · Accepted solution]

This an automatic process.

We are marking this post as solved, due to the either low activity or any reply marked as correct.
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NXP Community!

[dingding]

Thank you! I think I solved my problem.

[hhx]

void PWM1_Init(void)
{
 RatioStore = 65509;                  /* Store initial value of the ratio */
 /* PWMA_PMDISMAP1: DISMAP=0 */
 setReg(PWMA_PMDISMAP1,0);            /* Set up PWM Disable Mapping Register 1 */
 /* PWMA_PMDISMAP2: DISMAP=0 */
 setReg(PWMA_PMDISMAP2,0);            /* Set up PWM Disable Mapping Register 2 */
 /* PWMA_PMOUT: PAD_EN=0,??=0,OUTCTL=63,??=0,??=0,OUT=63 */
 setReg(PWMA_PMOUT,16191);            /* Set up Output Control Register */
 setReg(PWMA_PMDEADTM,0);             /* Set up Dead-Time Register */
 /* PWMA_PMCCR: ENHA=0,??=0,MSK=63,??=0,??=0,VLMODE=0,??=0,SWP45=0,SWP23=0,SWP01=0 */
 setReg(PWMA_PMCCR,16128);            /* Set up PWM Chanel Control Register */
 /* PWMA_PMCFG: ??=0,??=1,??=0,EDG=0,??=0,TOPNEG45=0,TOPNEG23=0,TOPNEG01=1,??=0,BOTNEG45=0,BOTNEG23=0,BOTNEG01=1,INDEP45=0,INDEP23=0,INDEP01=0,WP=0 */
 setReg(PWMA_PMCFG,4110);             /* Set up PWM configure register */
 setReg(PWMA_PMCNT,0);                /* Reset counter */
 setRegBits(PWMA_PMCFG,256);          /* Set polarity in the PWM configure register */
 EnUser = TRUE;                       /* Enable device */
 setReg(PWMA_PWMVAL0,2499);           /* Store initial value to the duty-compare register */
 setReg(PWMA_PWMCM,2500);             /* and to the period register */
 SetPV(3);                            /* Set prescaler register according to the selected high speed CPU mode */
}
static void SetRatio(void)
{
 setReg(PWMA_PWMVAL0,((getReg(PWMA_PWMCM)+1) * (dword)RatioStore) >> 16); /* Calculate new value according to the given ratio */
 setRegBit(PWMA_PMCTL,LDOK);          /* Load counter and modulo registers into buffers */
}

try this