S32 Design StudioのトピックRe: PWM interrupt not hitting

PWM interrupt not hitting

Hareesh — Wed, 28 Feb 2024 12:53:24 GMT

Hi NXP team,

We are using S32K344 EVK board and s32 design studio 3.5 .

We need to generate a PWM signal and generate the interrupts on both leading and falling edges of the pulse.

Is there any sample code in the SDK to do this one?

Although we are able to generate the PWM signal, but we are unable to generate the interrupt.

Please assist me in fixing this problem.

Best regards,

Hareesh

Re: PWM interrupt not hitting

Hareesh — Mon, 04 Mar 2024 09:50:28 GMT

Hi,

Could someone please assist me in resolving this problem?

Best regards,

Hareesh

Re: PWM interrupt not hitting

Robin_Shen — Tue, 05 Mar 2024 03:08:41 GMT

Hi Hareesh,

I'm sorry for the delay, I have been overloaded the last couple of days.

Please add the following function to the test project you sent me:
Emios_Pwm_Ip_SetFlagRequest(INSTANCE_0, CHANNEL_2, EMIOS_PWM_IP_INTERRUPT_REQUEST);

Best Regards,
Robin
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Re: PWM interrupt not hitting

Hareesh — Wed, 06 Mar 2024 12:01:54 GMT

Hi @Robin_Shen ,

Thanks for the update.

After adding that function, the PWM ISR is working properly.

However, how can we distinguish between leading-edge and trailing-edge events in the ISR?

Is there any event checking for both edges of the pulse?

Best regards,

Hareesh

Re: PWM interrupt not hitting

Robin_Shen — Thu, 07 Mar 2024 03:03:30 GMT

Try to read the voltage level of the PWM output pin in the ISR.

Re: PWM interrupt not hitting

Akhil1 — Fri, 08 Mar 2024 10:55:19 GMT

Hi @Hareesh ,

I am also working on PWM interrupt, can you please send me the sample code

Thanks Akhil

Re: PWM interrupt not hitting

Akhil1 — Fri, 08 Mar 2024 10:57:49 GMT

Hi @Robin_Shen ,

I am also working on PWM interrupt in s32K3, can you please provide the sample code for it

Thanks Akhil

Re: PWM interrupt not hitting

Hareesh — Mon, 11 Mar 2024 07:12:54 GMT

Hi @Robin_Shen ,

For the OPWFMB mode (variable frequency and variable duty cycle), we require a PWM frequency of 0.5 Hz.

The system clock and ADC clock will both decrease if the EMIOS module frequency is lowered to achieve lower frequency PWM because both have the same source clock (CORE_CLK) (Please refer the attached screenshot).

Is it feasible to switch the EMIOS module's clock source from CORE_CLK? If so, how should it be done?

If we set the CORE_CLK = 20 MHz,

EMIOS_CLK = 20M / 16(Clock Prescaler) = 1.25 MHz

Period [in ticks] = EMIOS_CLK / PWM in Hz

PWM in Hz = EMIOS_CLK / Period [in ticks]

PWM in Hz = 1.25 MHz / 65535 (The maximum value we can set in S32 DS IDE)

PWM in Hz = 19.07 HZ

Thus, we will only obtain a minimum PWM frequency of 19.07 Hz when we use the maximum clock prescaler and period value combinations.

In order to get a PWM frequency of 0.5 Hz in OPWFMB mode, what setups are required?

Best regards,

Hareesh

Re: PWM interrupt not hitting

Hareesh — Tue, 12 Mar 2024 04:11:12 GMT

Hi @Akhil1 ,

Please find the attached file for example code.

Best regards,

Hareesh

Re: PWM interrupt not hitting

Robin_Shen — Wed, 13 Mar 2024 03:26:36 GMT

Please ask a new question if you have any questions that are not related to the original topic of an existing case. It helps to keep it clear. Thank you for your understanding.

Re: PWM interrupt not hitting

Akhil1 — Wed, 13 Mar 2024 05:38:40 GMT

Hi @Hareesh ,

Thank you for your support..It is working fine.

Regards

Akhil

Re: PWM interrupt not hitting

Dev15 — Fri, 05 Apr 2024 05:33:04 GMT

@Hareesh ,

The project is not available to download. Please upload the pwm working ISR project.

Thank you