PWM issue

[Ayaz]

I am using S32K344 to generate PWM via eMIOS and flexio using OPWMB?

i have some dough regrade to the formular for calculating  the PWM frequency ?

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

I am using this formular for Emios can i use it also for flexio?

[ESAKKI_MBD]

I have a issue with OPWFMB mode for variable frequency & variable duty cycle. can you help me with this mode with an example?

I am encountering with the OPWFMB mode for variable frequency and duty cycle. can you help me with examples in understanding and troubleshooting such complexities.

Your expertise in this matter would greatly contribute to resolving the issue efficiently.

Thank you in advance for your attention to this matter. I look forward to your guidance and insights.

[Robin_Shen]

Hi

I don't think this formula for eMIOS can be used for Flexio_PWM. Have a look at Flexio_Pwm_Ip_Example_S32K344:

Flexio_Pwm_Ip_Example_S32K344_RTD300 FlexIO AIPS_PLAT_CLK.pngFlexio_Pwm_Ip_Example_S32K344_RTD300 Clock prescaler Period.png

Best Regards,
Robin
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[Ayaz]

what is the formula for flexio_pwm ?

[Robin_Shen · Accepted solution]

FlexIO PWM frequency = AIPS_PLAT_CLK/ Clock prescaler / Period[ticks]=48MHz/1/200=240 kHz

[Ayaz]

 first 1)

is the formular i am using for eMIOS correct ?

 PWM frequency = CORE_CLK / global prescaler / internal prescaler / (period ticks+1) or shoud it be 

PWM frequency = CORE_CLK / global prescaler / internal prescaler / (period ticks).

second 2) when i have for example period for 2400 ticks and i set duty cycle into 2400,100% duty cycle is not giving any output,but if i decrease the duty cycle only be  one ticks then the period then it will gives an output of 98,7%.

my setup is 

CORE_CLK=48MHz

global prescaler=1

internal prescaler=1

mcl 

Skærmbillede 2023-114.pngSkærmbillede 2023-11-27 093140.png

[Robin_Shen]

eMIOS PWM frequency has been discussed in S32K344 hardware PWM frequency, which is:

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

[ESAKKI_MBD]

in this formula I can't be able to understand what is B1?

[Ayaz]

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

under the example you send me this formular is for OPWFMB mode

does this formular applies on OPWMB mode also? 

[Robin_Shen]

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.

Clock prescaler Will only have an effect in OPWFMB and OPMCB modes.png

[Robin_Shen]

Yes, I think it's the same.

[Ayaz]

is it normal that if i apply 2399 ticks for period and i set the duty cycle 2399 to get 100% duty cycle ,is not giving my any output ,from the test i did ,the duty cycle most always be one ticks less the period to get 100% duty cycle ,it is for emios