What is GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS?

[Jong yoon lee]

Hello,

I am wondering what this "Low Power Event" is.

I am looking through the document but I can't find the place that explains this.

Can somebody point me to the place I should look into?

[haakonsh]

Hey John,

A low power event is a Port event instead of a Pin event. 

Cheers,

Håkon.

[Jong yoon lee]

Thank you for your pointers!

I read the document and have few questions.

In the document, it is said that Low Power Events are ' not that accurate and cannot be used to track high-speed pin changes".

What does it mean to be not accurate. Will some of the events not be generated? Is this to due with when you have multiple pins to connected?

How is the high-speed pin changes defined. If I have a interrupt pin that is generated every ~50ms, will it be feasible to use the "low power event? What about 1ms? Multiple peripherals wiht independent interrupts? 

WIll there be a delay to the event that is generated with the low power events?

Thanks in advance,

Best John

[haakonsh]

The port event will trigger from any pin change, the driver will then read the state of every pin declared as a low power GPIOTE pin and then execute the pins event handler. I believe 1ms is doable, but it depends on what the CPU is doing at the time. The GPIOTE event handler is executing from main context and priority level. Any SoftDevice or other higher priority activity will delay the execution of the pin event handler.