topic S32K118 Power management issues in S32 SDK

S32K118 Power management issues

zhaowei961 — Tue, 18 Feb 2020 01:48:11 GMT

When the power consumption mode is switched, the receiving of the serial port is affected. The serial port uses the interrupt mode. Even the switch from RUN to RUN also affects the receiving of the serial port. What's the matter?Can anybody help me?thank you very much.

Re: S32K118 Power management issues

danielmartynek — Tue, 18 Feb 2020 12:19:01 GMT

Hi zhaowei961@163.com,

The power manager switches the system clock (in run modes) as you can see below, therefore, it does affect the performance of every peripheral, and it disables the system clock in stop modes. .

But, if the MCU is in RUN mode already, the driver does not switch the mode:

Could you elaborate on how exactly it affects the LPUART in your application?

Regards,

Daniel

Re: S32K118 Power management issues

zhaowei961 — Tue, 18 Feb 2020 13:20:55 GMT

Re: S32K118 Power management issues

zhaowei961 — Tue, 18 Feb 2020 13:35:31 GMT

like abve code,I use uart0 interrupt in this way,after I send change power mode command several times,uart0 goes wrong.

Re: S32K118 Power management issues

zhaowei961 — Tue, 18 Feb 2020 13:57:35 GMT

Re: S32K118 Power management issues

danielmartynek — Wed, 19 Feb 2020 11:52:57 GMT

Hi zhaowei961@163.com,

I see that you are disabling the interrupt before it switches to RUN.

If you want to disable interrupts before the MCU switches power modes, you can mask them.

s32_core_cm4.h

DISABLE_INTERRUPTS()

ENABLE_INTERRUPTS()

BR, Daniel