S32KのトピックRe: emios _pwm

emios _pwm

Ayaz — Thu, 14 Mar 2024 11:36:51 GMT

I am using the example code for emios_pwm to get a pwm output at 400KHz.

configuration :

emios clock = 160MHz

pwm mode : OPWMB

the formular :

I conducted a lab test to measure the (PWM) output on an oscilloscope. The problem I'm having is that the delta frequency between the expected PWM output and the PWM output on the oscilloscope increases over 11 kHz, reaching 1000 kHz difference at 400 kHz.

what do i miss here ?

I am using s32k344 evaluation board.

Re: emios _pwm

Robin_Shen — Fri, 15 Mar 2024 03:19:29 GMT

Note: Clock prescaler(Internal Prescaler) Will only have an effect in OPWFMB and OPMCB modes.(Shown in S32 Configuration Tool). If OPWMB mode is selected, only global prescaler(Master Bus Prescaler) is active by using S32CT.

Best Regards,
Robin
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Re: emios _pwm

Salomi — Mon, 15 Apr 2024 07:30:04 GMT

Hi @Robin_Shen ,

I am trying to generate the PWN frequency using EMIOS_pwm for two sets Set '0' ( TOH - 0.4ns,TOL - 0.85ns) and Set '1' (T1H - 0.8ns,T1L - 0.45ns )which is given below,

Note: Using the following pattern ,to control the LED strip (WS2812B).

Core_CLk - 160MHz , EMIOS_0_CH17 , Mode: OPWMB , Counter Bus : A

kindly help me .

Thanks.