topic Re: wakeup from VLPS by timer for s32k144 in S32K

wakeup from VLPS by timer for s32k144

jacqueshsu — Wed, 29 Jun 2022 06:08:18 GMT

Hi,

I would like to implement VLPS mode, then wakeup by timer on s32K144. I can set s32k144 to VLPS mode, and wakeup by interrupt-GPIO. But no idea about how to wakeup by timer. Could you share some experiences with me for my purpose?

Re: wakeup from VLPS by timer for s32k144

danielmartynek — Wed, 29 Jun 2022 09:53:04 GMT

Hi @jacqueshsu,

As you can see in the RM, Table 7-8. AWIC stop and VLPS wake-up sources, you can use the LPIT timer.

LPIT is functional in VLPS if the function clock of this module is SIRC and LPIT_MCR[DOZE_EN] = 1.

The SIRC clock must be enabled in VLPS (SCG_SIRCCSR[SIRCSTEN = 1, SIRCLPEN = 1).

BR, Daniel

Re: wakeup from VLPS by timer for s32k144

jacqueshsu — Wed, 29 Jun 2022 10:39:22 GMT

Hi Daniel,

I use the following API to VLPS. Does the API include "SCG_SIRCCSR[SIRCSTEN = 1, SIRCLPEN = 1" and "LPIT_MCR[DOZE_EN] = 1"?

POWER_SYS_SetMode(VLPS, POWER_MANAGER_POLICY_AGREEMENT);

Re: wakeup from VLPS by timer for s32k144

danielmartynek — Wed, 29 Jun 2022 12:12:00 GMT

It does not.

Enable it by the Clock and LPIT drivers.

For example, in the PE GUI of DS2.2 IDE

BR, Daniel

Re: wakeup from VLPS by timer for s32k144

KILLERzheng — Mon, 26 Dec 2022 08:32:27 GMT

Hi Daniel,

I need this function, too. could you please help me?

How to wake up S32k146 from VLPS with LPIT - NXP Community