topic Wake up from VLPS mode using LPTMR in S32K

Wake up from VLPS mode using LPTMR

ED86 — Thu, 28 Dec 2023 06:53:59 GMT

I am trying to wake up my s32k116 MCU from VLPS mode using LPTMR0.

- LPTMR interrupt is enabled with priority as 0. The interrupts are fully functional in VLPR mode.

- LPTMR src clock is set to SIRC.

- state transition is as follows:- RUN->VLPR->VLPS

But the microcontroller is not able to wake up from VLPS mode.

Re: Wake up from VLPS mode using LPTMR

danielmartynek — Tue, 02 Jan 2024 07:51:24 GMT

Hi @ED86,

Can you check if SCG_SIRCCSR[SIRCEN = SIRCLPEN = SIRCSTEN = 1] before the MCU enters VLPS?

Thank you,

BR, Daniel

Re: Wake up from VLPS mode using LPTMR

ED86 — Tue, 02 Jan 2024 12:40:21 GMT

Following is the bit sequence for SCG_SIRCCSR register.

0011000000000000000000000101

As you can see SCG_SIRCCSR[SIRCEN] = 1, SCG_SIRCCSR[SIRCLPEN] = 1, but SCG_SIRCCSR[SIRCSTEN] = 0

Re: Wake up from VLPS mode using LPTMR

danielmartynek — Wed, 03 Jan 2024 07:56:32 GMT

Can you test it with SIRCSTEN = 1?

Thank you,

BR, Daniel

Re: Wake up from VLPS mode using LPTMR

ED86 — Thu, 04 Jan 2024 12:11:19 GMT

I am successfully wake up my MCU from VLPS mode using this solution. But flexcan is not working after waking up from VLPS mode.

Re: Wake up from VLPS mode using LPTMR

danielmartynek — Thu, 04 Jan 2024 12:20:58 GMT

Before the MCU entered VLPS, the clock sources (other than SIRC) as well as the FlexCAN module were disabled. Once the MCU is out of VLPS, the application must reeinitialize everything again.

Regards,

Daniel