topic Sleep mode in MKW01Z in Kinetis Microcontrollers

Sleep mode in MKW01Z

sergiiparadiuk — Mon, 30 Apr 2018 17:53:41 GMT

Hello,

I use use sleep mode, but I can only wake in 65535 ms seconds in maximum only.

I need to wake i time in 30 minutes. Is it possible to do?

My code for sleep mode:

PWRP_Init();
PWRP_ConfigureXCVRMode(pwrp_xcvr_sleep);
// Set timer source for wake up LPTM
PWRP_SetWakeUpSource(0x01);
PWRP_UpdateLPTMRCount(60 * 1000);

Enter_VLPS();

...

Re: Sleep mode in MKW01Z

mjbcswitzerland — Mon, 30 Apr 2018 19:18:16 GMT

Hi Sergii

The LPTMR has a pre-scaler that can decrease its counting speed by /2, /4, /8 .../64k. If you enable that with an appropriate setting you can get much long delays up to 49.7 days from LPO clock.

Regards

Mark

uTasker developer and supporter (+5'000 hours experience on +60 Kinetis derivatives in +80 product developments)
Kinetis: http://www.utasker.com/kinetis.html

Re: Sleep mode in MKW01Z

sergiiparadiuk — Mon, 30 Apr 2018 19:28:45 GMT

thank you for response, but I read this too, but how could I do from API?

2018-04-30 22:19 GMT+03:00 mjbcswitzerland <admin@community.nxp.com>:

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Re: Sleep mode in MKW01Z

mjbcswitzerland — Mon, 30 Apr 2018 21:18:39 GMT

Sergii

I don't know the API that you are using - you will need to read its documentation or check its implemention. If it doesn't support the pre-scaler setting you can simply do the following (after you call the setup).

1. Disable the LPTMR with LPTMR0_CSR &= ~1;
2. Set the pre-scaler value you need (assuming LPO clock)
LPTMR0_PSR = (LPO_CLOCK_SOURCE | (DIVIDE_VALUE << 3));
3. Re-enable again LPTMR0_CSR |= 1;

where DIVIDE_VALUE is 1 for divide by 2, 2 for divide by 4, 3 for divide by 8, 4 for divide by 16 etc.

This will then increase the timeout value that you set by this factor.

Regards

Mark

uTasker developer and supporter (+5'000 hours experience on +60 Kinetis derivatives in +80 product developments)
Kinetis: http://www.utasker.com/kinetis.html

Re: Sleep mode in MKW01Z

sergiiparadiuk — Tue, 01 May 2018 21:32:57 GMT

thanks. It helped!

2018-05-01 0:19 GMT+03:00 mjbcswitzerland <admin@community.nxp.com>:

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