Hi to the community,
I am trying to configure a PWM output between 300 and 600 Hz (FTM0, channel 0), in order to get this goal i must introduce the higher possible number on MOD(16 bits) register to reduce frequency, but its maximum available value is 65535(2^16 - 1), reaching a frequency around 1 KHz.
Is it possible on S32K144 to get those frequencies?
I am using this code:
void Edge_Align_PWM_Init() {
/* Enable clock for PORTD */
PCC->PCCn[PCC_PORTD_INDEX] = PCC_PCCn_CGC_MASK;
/* Select and enable clock for FTM0 */
PCC->PCCn[PCC_FLEXTMR0_INDEX] = PCC_PCCn_PCS(6) | PCC_PCCn_CGC_MASK;
/* Set PORTD pins for FTM0 */
PORTD->PCR[15] = PORT_PCR_MUX(2); // FTM0, Channel0
PORTD->PCR[16] = PORT_PCR_MUX(2); // FTM0, Channel1
PORTD->PCR[0] = PORT_PCR_MUX(2); // FTM0, Channel2
PORTD->PCR[1] = PORT_PCR_MUX(2); // FTM0, Channel3
/* Enable registers updating from write buffers */
FTM0->MODE = FTM_MODE_FTMEN_MASK;
/* Enable sync, combine mode and dead-time for pair channel n=1 and n=2 */
FTM0->COMBINE = 0x0u | FTM_COMBINE_COMP1_MASK | FTM_COMBINE_DTEN1_MASK;
/* Set Modulo in initialization stage (10kHz PWM frequency @112MHz system clock) */
FTM0->MOD = FTM_MOD_MOD(64000-1);//11200->10KHz
/* Set CNTIN in initialization stage */
FTM0->CNTIN = FTM_CNTIN_INIT(0);
/* Enable high-true pulses of PWM signals */
FTM0->CONTROLS[0].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;
FTM0->CONTROLS[1].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;
/* Set channel value in initialization stage */
FTM0->CONTROLS[0].CnV=FTM_CnV_VAL(32000); // 50% duty cycle
FTM0->CONTROLS[1].CnV=FTM_CnV_VAL(32000); // 50% duty cycle
/* Reset FTM counter */
FTM0->CNT = 0;
/* Insert deadtime (1us) */
FTM0->DEADTIME = FTM_DEADTIME_DTPS(3) | FTM_DEADTIME_DTVAL(7);// 3 y 7
/* Clock selection and enabling PWM generation */
FTM0->SC = FTM_SC_CLKS(1) | FTM_SC_PWMEN0_MASK | FTM_SC_PWMEN1_MASK | FTM_SC_PWMEN2_MASK | FTM_SC_PWMEN3_MASK;
}
Best regards,
Jorge
