PWM generation and trigger on match in S32K144EVM.

[Kapila]

How does this instruction generates trigger

if (1==((FTM0->CONTROLS[0].CnSC & FTM_CnSC_CHF_MASK)>>FTM_CnSC_CHF_SHIFT))

{

/* - If chan flag is set: */

FTM0->CONTROLS[0].CnSC &= ~FTM_CnSC_CHF_MASK;  /* Clear flag: read reg then set CHF=0 */

if(  FTM0->CONTROLS[0].CnV==56250)

{

/* - If count at last value before end: */

FTM0->CONTROLS[0].CnV= 0 ;  /* Update compare value: to 0 */

}

else

{

FTM0->CONTROLS[0].CnV= FTM0->CONTROLS[0].CnV + 6250 ;

/* - else: */

/* Update compare value: add 6250 to current value */

}

I request some one to clarify me,

Thanks in advance

Kanakaraju

[Robin_Shen]

Hi 

Have you read AN5303: Features and Operation Modes of FlexTimer Module on S32K – Application Note and AN5303SW?

The code you attached just clears the flag after checking CHF and updates the value of CnV to adjust the PWM duty cycle.

If you want to understand the mechanism of CnV update, it is recommended to read chapter 4.3. Updating FTM registers of AN5303.

Best Regards,
Robin
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