topic Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode in S32K

Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Wed, 08 Jan 2025 12:21:42 GMT

Hi team,

I am currently working on a project that involves using the eMIOS in the OPWFMB mode. My goal is to implement a control strategy where both the phase shift and the switching frequency can be dynamically adjusted based on real-time system requirements.

While I have successfully configured the eMIOS module in OPWFMB mode for basic PWM generation, I am finding it challenging to synchronise and control the phase shift along with switching frequency variation. How can I dynamically introduce phase shift adjustments in OPWFMB mode while maintaining PWM synchronisation? Are there any recommended techniques or examples for implementing both these adjustments in a microcontroller with eMIOS capabilities?

Thanks in advance!

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Thu, 09 Jan 2025 09:32:19 GMT

@VaneB @Julián_AragónM or anyone else from NXP, please reply. This is really urgent.

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Fri, 10 Jan 2025 16:53:57 GMT

@VaneB @Julián_AragónM @Senlent or anyone else from NXP, please reply. This is really urgent.

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Mon, 13 Jan 2025 04:41:05 GMT

@VaneB @joanxie @Senlent Please reply.

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

_Leo_ — Mon, 13 Jan 2025 20:38:20 GMT

Hi,

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

Phase shift capability is not supported in OPWFMB. If you require phase shift feature you need to implement OPWMCB, OPWMB or OPWMT modes.

For reference:

Example S32K344 eMIOS DS3.5 RTD500

Hope it helps you.

Have a nice day!

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Tue, 14 Jan 2025 04:54:27 GMT

Hi @_Leo_

Then how do I implement frequency modulation along with phase delay/shifting in the OPWMCB, OPWMB or OPWMT modes, that you mentioned?

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

_Leo_ — Fri, 17 Jan 2025 18:04:35 GMT

Frequency modulation is only possible in OPWFMB. You could refer to the following training presentation to see how eMIOS modes work.

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Sat, 18 Jan 2025 04:49:12 GMT

Hi @_Leo_

Thank you for the reply.

But I require dual control of frequency as well as phase shift modulation of PWM signals. Can you please suggest any other peripheral apart from eMIOS that can achieve this type of control?

Or else, can you suggest me any microcontroller from NXP which is compatible for this type of dual control?

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Thu, 30 Jan 2025 10:22:53 GMT

Hi @_Leo_

Its been more than 2 weeks since I've asked about this. Please reply.

Re: Implementing Phase Shift Change Along with Switching Frequency in eMIOS OPWFMB Mode

abdul_rahman — Mon, 10 Mar 2025 15:14:51 GMT

Solution for frequency + phase shift of PWM pulses:-

1. Set the eMIOS mode in OPWMB mode.

2. Use the eMIOS_Mcl function "Emios_Mcl_Ip_SetCounterBusPeriod" to change the frequency. Using the "Emios_Pwm_Ip_SetPeriod" to control the frequency will not work in OPWMB mode.

3. Use the eMIOS_Pwm function "Emios_Pwm_Ip_SetPhaseShift" to change the phase shift.