topic Re: MKL15Z128VFM4 LLWU wakeup pin in Kinetis Microcontrollers

MKL15Z128VFM4 LLWU wakeup pin

geniusgogo — Fri, 13 Jan 2017 12:47:56 GMT

my board used LPTMR and PTC3 wakeup the LLWU mode on VLPS,

LPTMR able wakeup,

PTC3 can't wakeup,

What causes it?

init code:

llwu_external_pin_filter_mode_t filterMode;

pin_config.pinDirection = kGPIO_DigitalInput;
pin_config.outputLogic = 0;

// MCU wakeup pin
GPIO_PinInit(GPIOC, 3, &pin_config);

/* Setup LPTMR. */
LPTMR_GetDefaultConfig(&lptmrConfig);
lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_1; /* Use LPO as clock source. */
lptmrConfig.bypassPrescaler = true;
lptmrConfig.enableFreeRunning = true;
LPTMR_Init(LPTMR0, &lptmrConfig);
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
LLWU_EnableInternalModuleInterruptWakup(LLWU, 0, true);
// setup external PTC3 pin
LLWU_SetExternalWakeupPinMode(LLWU, 7, kLLWU_ExternalPinAnyEdge);
NVIC_EnableIRQ(LLWU_IRQn);
NVIC_EnableIRQ(LPTMR0_IRQn);

......

sleep ongo:

LPTMR_SetTimerPeriod(LPTMR0, 60000);
LPTMR_StartTimer(LPTMR0);
LLWU_SetExternalWakeupPinMode(LLWU, 7, kLLWU_ExternalPinAnyEdge);
SMC_SetPowerModeVlps(SMC);

Re: MKL15Z128VFM4 LLWU wakeup pin

mjbcswitzerland — Fri, 13 Jan 2017 16:03:36 GMT

The LLUW can't be used to wake the processor from VLPS (very low power STOP) because this mode is not a Low Leakage Mode (from LLS), meaning that the LLWU is not active when you set the VLPS mode.
To wake from VLPS you need an asynchronous interrupt. You can wake if you set LLS, for example.

http://www.utasker.com/kinetis/LLWU.html

Regards

Mark

http://www.utasker.com/kinetis/FRDM-KL25Z.html

Re: MKL15Z128VFM4 LLWU wakeup pin

geniusgogo — Sat, 14 Jan 2017 10:03:37 GMT

thanks,really is so.

very very thanks.

Re: MKL15Z128VFM4 LLWU wakeup pin

jorge_a_vazquez — Mon, 16 Jan 2017 19:02:28 GMT

Hi genius gogo

If you want to set LLS mode you could check the following doc:https://community.nxp.com/docs/DOC-332687

Here is an example of how to set and use this mode in a FRDM-KL26Z.

Hope this could help

Regards

Jorge Alcala