topic Re: S32K144_PowerManager_Example in S32K

S32K144_PowerManager_Example

hajianik — Wed, 12 Jul 2017 22:37:52 GMT

Hi , I'm running the project S32K144_PowerManager_Example.

Few question on this.

The option 3 in the menu is not working for me. Don't know why? This is true with and without the debugger, in fact when the debugger is running when I choose option 3 it resets, is due to clk frequency? I thought the core ,bus clocks are active in this mode?
There is no "WFI" instruction before entering the varius low power modes, why is that?

Thanks

Re: S32K144_PowerManager_Example

danielmartynek — Thu, 13 Jul 2017 07:43:22 GMT

Hi,

This is caused by a bug in a clock manager component.

To fix it, in the PowerManager example project in DSK/platform/hal/scr/scg/scg_hal.c

change regAddr = &base->VCCR to regAddr = &base->HCCR (line 186)

remove line 187 with base->HCCR = value

This bug will be fixed in the release after RTM SDK (0.8.3).

Regards,

Daniel

Re: S32K144_PowerManager_Example

hajianik — Thu, 13 Jul 2017 14:04:15 GMT

Thanks for the response,

What about my other question regarding the instruction "WFI" , IN THE DATA SHEET IT IS SAID ENTERING A LOW POWER MODE IS TRIGGERED BY "WFI" ,however it is not used in this example anywhere?

What is the story there?

Regards,

Re: S32K144_PowerManager_Example

danielmartynek — Thu, 13 Jul 2017 14:40:13 GMT

Hi,

SMC_HAL_SetPowerMode() in smc_hal.c uses STANDBY() function:

s32_core_cm4.h

Regards,

Daniel

Re: S32K144_PowerManager_Example

hajianik — Thu, 13 Jul 2017 17:11:31 GMT

I spoke too soon.

Thanks,

Re: S32K144_PowerManager_Example

hajianik — Thu, 13 Jul 2017 17:28:13 GMT

Hi Daniel,

Just one more thing,

Do you know how to measure the current on this board(S32KEVB)?

I ASKED THIS QUESTION BEFORE AND GOT NO ANSWERS.

There is a MCU Current Measurement section in the schematic a 0ohm resistor and a jumper across(J15), do I need to populate it with a known value resistor and measure the voltage across and divide to get the current?

Thanks.

Re: S32K144_PowerManager_Example

danielmartynek — Thu, 13 Jul 2017 18:12:30 GMT

Hi,

Simply dump the resistor (R117) and use an ammeter. I measure the current this way.

I don't see a reason for a precise resistor, but you can do that, if you want to.

Regards,

Daniel