topic Re: Kl15Z128 Flash writing in VLPR Mode in Kinetis Microcontrollers

Kl15Z128 Flash writing in VLPR Mode

shrejjjhh — Fri, 24 Aug 2018 05:28:43 GMT

Hi,

I am using MCUExpressoIDE SDK sample code(pflash) for flash writing. The code is given for BOARD_BootClockRUN() but I want to use it for BOARD_BootClockVLPR() mode please help.

Regards,

shrek

Re: Kl15Z128 Flash writing in VLPR Mode

kerryzhou — Fri, 24 Aug 2018 08:22:40 GMT

Hi Shre,

Thank you for your interest in NXP kinetis product, I would like to provide service for you.

The KL15 can't support the flash program in the VLPR mode, please check the KL15 reference manual:

Sorry for the inconvenience we bring you.

Wish it helps you!

Have a great day,
Kerry

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Kl15Z128 Flash writing in VLPR Mode

shrejjjhh — Fri, 24 Aug 2018 09:46:29 GMT

Hi Kerry,

Thanks for your reply.

Is there any way to switch the mode at runtime for flash writing, as shown in the example below?

for example:

void main

{

BOARD_BootClockVLPR() ; //Initialize VLPR mode

BOARD_BootClockRUN() ; //switch to RUN Mode

Flash_Program(); //program flash

BOARD_BootClockVLPR() ; //switch to VLPR mode

}

Regards,

Shrej

Re: Kl15Z128 Flash writing in VLPR Mode

kerryzhou — Mon, 27 Aug 2018 03:26:27 GMT

Hi Shrejjhh,

Yes, if you want to do the flash program, you can change the power mode to RUN, then do the flash program, after that, you can go back the VLPR again.

Actually, just the power mode switch.

About the power mode switch, you can refer to our SDK code, power_mode_switch, you can find it in folder :

FRDM-KE15Z\boards\frdmke15z\demo_apps\power_mode_switch

SDK can be downloaded from this link:

Welcome | MCUXpresso SDK Builder

void APP_PowerModeSwitch(smc_power_state_t curPowerState, app_power_mode_t targetPowerMode)
{
    switch (targetPowerMode)
    {
        case kAPP_PowerModeVlpr:
            APP_SetClockVlpr();
            SMC_SetPowerModeVlpr(SMC);
            while (kSMC_PowerStateVlpr != SMC_GetPowerModeState(SMC))
            {
            }
            break;

case kAPP_PowerModeRun:

            /* Power mode change. */
            SMC_SetPowerModeRun(SMC);
            while (kSMC_PowerStateRun != SMC_GetPowerModeState(SMC))
            {
            }

            /* If enter RUN from VLPR, change clock after the power mode change. */
            if (kSMC_PowerStateVlpr == curPowerState)
            {
                APP_SetClockRunFromVlpr();
            }
            break;

        case kAPP_PowerModeWait:
            SMC_PreEnterWaitModes();
            SMC_SetPowerModeWait(SMC);
            SMC_PostExitWaitModes();
            break;

        case kAPP_PowerModeStop:
            SMC_PreEnterStopModes();
            SMC_SetPowerModeStop(SMC, kSMC_PartialStop); /* Normal STOP mode. */
            SMC_PostExitStopModes();
            break;

        case kAPP_PowerModeVlpw:
            SMC_PreEnterWaitModes();
            SMC_SetPowerModeVlpw(SMC);
            SMC_PostExitWaitModes();
            break;

        case kAPP_PowerModeVlps:
            SMC_PreEnterStopModes();
            SMC_SetPowerModeVlps(SMC);
            SMC_PostExitStopModes();
            break;

        default:
            PRINTF("Wrong value");
            break;
    }
}

Wish it helps you!

Have a great day,
Kerry

Re: Kl15Z128 Flash writing in VLPR Mode

shrejjjhh — Mon, 27 Aug 2018 06:51:40 GMT

Hi Kerry,

Thanks for your reply.

Is it require to set clock every time switching the power mode? Because AN4503(8.1.1 Entering and exit conditions for each low power mode,page 36) does not mentioned this.

As per AN4503, we need to modify PMPROT[AVLP]=1, PMCTRL[RUNM]=10 to switch from RUN mode to VLPR mode which is handled by SMC_SetPowerModeVlpr(SMC);

And modify PMCTRL[LPWUI] =1 which is handled by SMC_SetPowerModeRun(SMC);

But the SDK example code uses APP_SetClockVlpr(); and APP_SetClockVlpr(); Is it really required?

Regards,

Shrej

Re: Kl15Z128 Flash writing in VLPR Mode

kerryzhou — Tue, 28 Aug 2018 03:31:05 GMT

Hi Shre jjjhh,

Please check the KL15 reference manual, chapter 7: power management, you can find the VLPR have the clock limit, that's why we tell you do the clock switch:

So, please refer to the KL15 sdk code, that is really what you need.

Wish it helps you!

Have a great day,
Kerry