count the number of gpio changes

[puff]

Probably, I am having a problem with finding the proper query phrase. 

I have a sensor (Hall-type sensor) that generates pulses, and I need to count the total number of pulses and update this number in some GATT property. 

I'm looking for a tutorial on using external interrupts (probably?) 

Since the sensor is not always on - probably, there might be some tricks to reduce power consumption? (I need to keep the number of pulses all the time, even if my device is powered off) 

[bjorn-spockeli]

Hi puff, 

I would recommend using the GPIO port event and tie that to the TASKS_COUNT of a TIMER peripheral in counter mode using the PPI peripheral. See the Timer Example, Timer HAL and driver, GPIOTE abstraction and driver, and PPI HAL and driver.

Best regards

Bjørn