K82: LLWU_SetPinFilterMode() API

EugeneHiihtaja — Wed, 09 Jan 2019 09:39:07 GMT

Hello !

Could you clarify a bit what LLWU filter means ?

As input it has structure llwu_external_pin_filter_mode_t

what has parameter

typedef enum _llwu_pin_filter_mode
{
kLLWU_PinFilterDisable = 0U, /*!< Filter disabled. */
kLLWU_PinFilterRisingEdge = 1U, /*!< Filter positive edge detection.*/
kLLWU_PinFilterFallingEdge = 2U, /*!< Filter negative edge detection.*/
kLLWU_PinFilterAnyEdge = 3U /*!< Filter any edge detection. */
} llwu_pin_filter_mode_t;

But edge detection is set by LLWU_SetExternalWakeupPinMode() API.

in RM , chpter 19.5 I can see

The LLWU implements optional 3-cycle glitch filters, based on the LPO clock. A
detected external pin is required to remain asserted until the enabled glitch filter times
out. Additional latency of up to 2 cycles is due to synchronization, which results in a total
of up to 5 cycles of delay before the detect circuit alerts the system to the wakeup or reset
event when the filter function is enabled. wakeup detect filters are available for selected
external pins. Glitch filtering is not provided on the internal modules.

How setup proper filter for LLWU pin ? I use LLS3 low power mode if it any difference with other low power modes.

Regards,

Eugene

Re: K82: LLWU_SetPinFilterMode() API

Robin_Shen — Thu, 24 Jan 2019 07:46:55 GMT

Hi Eugene,

If kLLWU_ExternalPinRisingEdge is selected, then you should configure kLLWU_PinFilterRisingEdge.

Notice VLLS0 mode:

Best Regards,

Robin

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topic Re: K82: LLWU_SetPinFilterMode() API in Kinetis Microcontrollers

K82: LLWU_SetPinFilterMode() API

Re: K82: LLWU_SetPinFilterMode() API