Model-Based Design Toolbox (MBDT)のトピックRe: OPWMB_PWM_FREQ_ISSUE

OPWMB_PWM_FREQ_ISSUE

ESAKKI_MBD — Wed, 06 Mar 2024 05:33:50 GMT

HELLO EVERYONE,

I'm testing the PWM using EMIOS and I facing some doubts:

Informations:

CLK is 160MHz.

and for pwm frequency calculation i used

PWM peripheral clock = CORE_CLK/ Core_clk_divider/ Global_prescaler/ Clock_prescaler

but my required output is getting wrong. after i research in nxp community i got two different formulas,

1. PWM frequency = CORE_CLK / global prescaler / internal prescaler / (period [ticks] x 2)
Period[ticks] = CORE_CLK / PERIOD_FREQ / 2

2. PWM frequency = CORE_CLK / global prescaler / internal prescaler / (B1+1)

which one is correct formula for calculation of frequency and duty cycle.

@VaneB @Robin_Shen @Irina_Costachescu

Thanks in advance.

Re: OPWMB_PWM_FREQ_ISSUE

Irina_Costachescu — Wed, 06 Mar 2024 07:33:13 GMT

Hi @ESAKKI_MBD,

Could you please check the following article posted on our community (link)?

It provides all the necessary information on how to configure and use the PWM component in MBDT applications (Section 4. PWM Configuration). It also includes the explained formulas for computing the Frequency and Period of generated PWM signals, inside Section 4.4 MCL. However, I would recommend going through the entire article for more details on PWM Peripheral, Pins, Clocks and Interrupts configuration.

Please let us know if this helps or if any additional information/guidance is needed from our side.

Thanks,

Irina

Re: OPWMB_PWM_FREQ_ISSUE

Robin_Shen — Wed, 06 Mar 2024 08:12:31 GMT

Please refer to the discussion in https://community.nxp.com/t5/S32K/PWM-issue/m-p/1763225