PWM frequency and duty how to set?

pandi — Fri, 23 Feb 2024 05:37:46 GMT

In MKV31F512VLL12 FTM how to set constant PWM frequency and duty if any formula give to me help

for us.

Thank you

PANDI

Re: PWM frequency and duty how to set?

_Leo_ — Fri, 23 Feb 2024 19:49:34 GMT

Hi,

Thank you so much for your interest in our products and for using our community.

In the SDK of the FRDM-KV31F there are the following PWM examples with the FTM that you could take as reference.

Hope it helps you.

Have a nice day!

Re: PWM frequency and duty how to set?

pandi — Mon, 04 Mar 2024 13:11:49 GMT

@_Leo_

FTM PWM channels how to set constant frequency and duty .

ex;16 KHZ and 50 duty how to set

This code register level program. output 10 KHZ frequency constant but when above 10 KHZ did not constant of frequency and duty how to set?

void TIM0_PWM_Init(uint32_t pwm_freq) {

uint32_t clk_freq = SystemCoreClock;

uint32_t pwm_period = clk_freq / pwm_freq;

SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK;

PORTC->PCR[1] = PORT_PCR_MUX(0x4); // FTM0_CH0 on PTC1

PORTC->PCR[2] = PORT_PCR_MUX(0x4); // FTM0_CH1 on PTC2

PORTC->PCR[3] = PORT_PCR_MUX(0x4); // FTM0_CH2 on PTC3

SIM->SCGC6 |= SIM_SCGC6_FTM0_MASK;

FTM0->MODE |= FTM_MODE_WPDIS_MASK;

FTM0->MOD = pwm_period - 1;

FTM0->CONTROLS[0].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;

FTM0->CONTROLS[1].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;

FTM0->CONTROLS[2].CnSC = FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK;

FTM0->CONTROLS[0].CnV = (pwm_period * 60) / 50;

FTM0->CONTROLS[1].CnV = (pwm_period * 50) / 100;

FTM0->CONTROLS[2].CnV = (pwm_period * 50) / 100;

FTM0->SC = FTM_SC_PS(0); // No prescaler

FTM0->SC |= FTM_SC_CLKS(1); // System clock

FTM0->SC|=FTM_SC_TOF_MASK;

NVIC_EnableIRQ(FTM0_IRQn);

}

void UpdateFTM0_Channel(uint8_t channel, uint32_t pwm_freq, uint8_t dutyCyclePercent) {

if (dutyCyclePercent > 100) {

dutyCyclePercent = 100;

}

uint32_t clk_freq = SystemCoreClock;

uint32_t pwm_period = clk_freq / pwm_freq;

FTM0->MOD = pwm_period - 1;

uint32_t cnvValue = (pwm_period * dutyCyclePercent) / 100;

if (channel < 3) {

FTM0->CONTROLS[channel].CnV = cnvValue;

}

FTM0->PWMLOAD |= FTM_PWMLOAD_LDOK_MASK;

}

UpdateFTM0_Channel(1,2016,50);

HOW TO SET GENERATED CODE?

Thank you

PANDI

topic PWM frequency and duty how to set? in Kinetis Microcontrollers

PWM frequency and duty how to set?

Re: PWM frequency and duty how to set?

Re: PWM frequency and duty how to set?