topic Re: [S32K3_MCAL_API] Mcu_SetMode() take up a lot of time in S32K

[S32K3_MCAL_API] Mcu_SetMode() take up a lot of time

wuxianlong — Wed, 15 Feb 2023 10:46:20 GMT

Hi,all

  We need to set up CAN Bus quickly, but Mcu_SetMode() is taking up a lot of time( 85 ~ 120 ms).
  Can I optimize the configuration of Mcu_SetMode? Or some other solution?

BRs,

xianlong

Re: [S32K3_MCAL_API] Mcu_SetMode() take up a lot of time

DanNguyenDuy — Thu, 16 Feb 2023 02:55:34 GMT

Hi @wuxianlong,

Before call Mcu_SetMode, you should call Mcu_InitClock() to change clocks to the correct values with the mode that needs to change as described details in the Reference manual.

At the moment, I have only this proposal.

Best regards,

Dan

Re: [S32K3_MCAL_API] Mcu_SetMode() take up a lot of time

thorben_kamp — Thu, 19 Mar 2026 13:33:27 GMT

We are facing a similar issue. The function Mcu_SetMode requires up to 40 ms to complete, and we call Mcu_InitClock beforehand.

Mcu_Init(&Mcu_Config); Mcu_InitClock(McuClockSettingConfig_0); while(MCU_PLL_LOCKED != Mcu_GetPllStatus()) { /* Busy wait until the System PLL is locked */ } Mcu_DistributePllClock(); Mcu_SetMode(McuModeSettingConf_0); /* Initialize Platform Driver */ Platform_Init(NULL_PTR);

Re: [S32K3_MCAL_API] Mcu_SetMode() take up a lot of time

wuxianlong — Fri, 20 Mar 2026 01:15:22 GMT

Hi，

The following two do not need to be checked. There are also some other questions, which can be referred to this.

Best Regaeds,
xianlong

Re: [S32K3_MCAL_API] Mcu_SetMode() take up a lot of time

thorben_kamp — Tue, 07 Apr 2026 10:02:10 GMT

Thanks for your response.

I noticed that the duration is reduced to about 20 ms when I change this setting. If I also uncheck CM7_1 and CM7_2 under MCU control, the duration drops further to less than 1 ms.

What impact does this configuration have on the rest of the software? Are there any side effects or dependencies I should be aware of when removing these cores from MCU control?