S32k312 EMIOS PWM output

Dev15 — Thu, 01 Aug 2024 15:09:13 GMT

I'm trying to configure some PWM output signals in EMIOS 0 and EMIOS 1 instances to generate up t0 20KHz frequency.

S32 Design Studio for S32 Platform
Version: 3.5

S32k312 evaluation board

Below are my configurations screen shots for reference

Currently, global clock for EMIOS 0 and 1 are 160 MHz.

For testing, I tried to generate 1000 Hz and 50 % duty cycle. The scope result is not as expected. Only duty cycle is correct and frequency is not correctly displayed.

#define PWM_CLOCK_FREQUENCY (120000000U)
#define PWM_PRESCALAR (3U)
#define PWM_DIV_FREQUENCY ((PWM_CLOCK_FREQUENCY/PWM_PRESCALAR))

pwm_Frequency = 1000U;
Pwm_Period[pwm_ChannelId] = (PWM_DIV_FREQUENCY/pwm_Frequency);
Pwm_DutyCycle[pwm_ChannelId] = ((Pwm_Period[pwm_ChannelId] * pwm_DutyCycle)/100);

Below API's are called in the code for frequency & duty cycle.

Emios_Pwm_Ip_SetPeriod(INSTANCE_0, Emios_Pwm_Ip_I0_Ch0.ChannelId, Pwm_au16Period[pwm_ChannelId]);
Emios_Pwm_Ip_SetDutyCycle(INSTANCE_0, Emios_Pwm_Ip_I0_Ch0.ChannelId, Pwm_DutyCycle[pwm_ChannelId]);

Also, what is the purpose of Emios_Mcl_Ip_SetCounterBusPeriod() API. Do we need to call one time on initialization or every time when new frequency and duty cycle are called.

Please let me know if anything configured incorrectly

Thank you,

Re: S32k312 EMIOS PWM output

Dev15 — Mon, 05 Aug 2024 07:33:47 GMT

@Senlent ,

Any update on the above request please?

Thank you,

Re: S32k312 EMIOS PWM output

_Leo_ — Fri, 09 Aug 2024 01:06:42 GMT

Hi,

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

For PWM_CLOCK_FREQUENCY (120000000U):
1s -> 120MHz (120,000,000 ticks)
1kHz = (1/1,000)s
->120,000,000 *(1/1,000) = 120,000 ticks
But the max ticks is 65534.

What you can do is reduce PWM_CLOCK_FREQUENCY to archive lower PWM frequencies.

On the other hand S32K312 Examples are included in S32DS 3.4 with RTD 2.x.x. You can have multiple IDEs.

Hope it helps you.

Have a nice day!

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