NRF9160 Low Power Edge interrupt

[Maaike]

Dear All,

We are currently developing a low power application for the nRF9160, with ncs zephyr version 1.2.0.
For our application we want to trigger an interrupt on both the rising and falling edge. We use the GPIO_INT, GPIO_INT_EDGE, GPIO_INT_DOUBLE_EDGE flags for this. However, the edge interrupt increases the power consumption with ~45 microA. For the full application we aim to achieve a power consumption of ~15 microA.

Is there a way to implement an interrupt on edge in low power in v1.2.0? If not, is this possible in a later version?

Kind regards,
Maaike

[Håkon Alseth]

Hi,

 

GPIO_INT*_EDGE will enable the use of a GPIOTE IN channel (code reference here: https://github.com/nrfconnect/sdk-zephyr/blob/master/drivers/gpio/gpio_nrfx.c#L110), compared to using GPIO SENSE and the GPIOTE PORT event.

GPIO SENSE can do level triggering, while edge-triggering can only be done by GPIOTE IN channel, which does add ~30 uA in sleep (this number depends on which nRF-device is used).

 

Kind regards,

Håkon

[Maaike]

Thank you for the information.

Kind regards,
Maaike