topic Re: S32K388 eMIOS init ended in BUSFAULT in S32K

S32K388 eMIOS init ended in BUSFAULT

OndrejK — Mon, 18 Aug 2025 11:07:56 GMT

Hi team,

Me and my colleagues working on new design of our main products and we choose S32K344 and S32K388 MCU.
Now we are playing with ICU (IPWM) and OCU (OPWM) EMIOS functionality and testing this on S32K344 (PVEV board) and S32K388 EVB board) MCU. I pickup example projects from RTD 6.0.0 D2506 version S32DS 3.6.3 and these working fine with clock domain set us running from FIRC (48 MHz).
But when I change clock domain to external OSC (16MHz) ,PLL chain and EMIOS is clocking from CORE_CLK (120 or 160 MHz) first try to write EMIOS MCR register ended with BUSFAULT escalate to HARDFAULT.
Seems for me that some initialization missing but I haven't idea what. Funny is that example for using EMIOS PWM output mode works for me well for both clock domain settings (FIRC and external OSC) Have somebody any tips, idea what I need to do in project?

Here is my projects for review:

Re: S32K388 eMIOS init ended in BUSFAULT

_Leo_ — Mon, 18 Aug 2025 19:13:17 GMT

Thank you for your interest in our products and for contributing to our community.

Please refer to the following community post:

S32M27x/S32K3 – eMIOS Usage ->
https://community.nxp.com/t5/S32M-Knowledge-Base/S32M27x-S32K3-eMIOS-Usage/ta-p/2129760

Examples are clocked in the following way:

I hope this information is helpful.

Re: S32K388 eMIOS init ended in BUSFAULT

OndrejK — Tue, 19 Aug 2025 08:11:54 GMT

Hi Leo,

I trying this project again and setup clock follow your screenshot but still is there HARDFAULT.
One question: you r screenshot is from what environment-versions? MCU, S32DS.RTD? Because main looks different:

and you can see that EMIOS IP is driving from CORE_CLK.
I try to add Emios_Mcl_Ip_Init function (I not sure if that really missing) to my main.c:

and here is exact place where code first time try access EMIOS-MCR register and step over this cause HARDFAULT immediately:

Please can you try my projects on your side?
I again attaching original example which works on FIRC clocks(original_example.zip) and adjusted project(adjusted.zip) witch is switched to ExtOSC 16MHz on my S32K388EVB-Q289 board

Re: S32K388 eMIOS init ended in BUSFAULT

OndrejK — Tue, 19 Aug 2025 09:08:12 GMT

Hi Leo

I found out issue here:
is needed just change Clock_Ip_Init(&Clock_Ip_aClockConfig[0]) function instead Clock_Ip_InitClock(&Clock_Ip_aClockConfig[0]) used on example which is "sub function of previous one.

Now is working for and you can mark this as SOLVED
Thank you for your interest