How many interrupt pins we can enable in NRF52840?

RE: How many interrupt pins we can enable in NRF52840?

sne_333 — Tue, 03 Jan 2023 07:54:18 GMT

Thank you so much. Setting GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS to 7 resolved my issue. Now it is working even if I set GPIOTE_CONFIG_IN_SENSE_HITOLO(false).

RE: How many interrupt pins we can enable in NRF52840?

Einar Thorsrud — Tue, 03 Jan 2023 07:26:30 GMT

Hi,

[quote user="snehal_2789"]

According to your suggestion I changed the config in sdk_config.h as below:-

#ifndef NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS
#define NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 7
#endif

[/quote]

As you are using the nrf_drv API you need to set the GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS and not the NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS, and then this should work.

[quote user="snehal_2789"]

Then I changed the configuration of pins from GPIOTE_CONFIG_IN_SENSE_HITOLO(false) to GPIOTE_CONFIG_IN_SENSE_HITOLO(true). Now I am not getting any errors.

Is this change ok?

[/quote]

Yes, in most cases. When set to true, you are using GPIOTE instead of port event. The down side is a slightly higher power consumption (which may or may not be an issue for you). There are 8 GPIOTE channels on the nRF52840, so using 7 is no problem.

RE: How many interrupt pins we can enable in NRF52840?

sne_333 — Tue, 03 Jan 2023 05:51:23 GMT

Hi Einar Thorsrud ,

According to your suggestion I changed the config in sdk_config.h as below:-

#ifndef NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS
#define NRFX_GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 7
#endif

Previously the value set was 1. But still was not able to enable the interrupts.

Then I changed the configuration of pins from GPIOTE_CONFIG_IN_SENSE_HITOLO(false) to GPIOTE_CONFIG_IN_SENSE_HITOLO(true). Now I am not getting any errors.

Is this change ok?

RE: How many interrupt pins we can enable in NRF52840?

Einar Thorsrud — Mon, 02 Jan 2023 15:03:52 GMT

Hi,

You configure the pins with GPIOTE_CONFIG_IN_SENSE_HITOLO(false);, and as you set false here that means you are not using GPIOTE. That could be OK, but in that case you need to adjust the number of low power events (whici is 4 by default in most applications). To do so, adjust GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS in sdk_config.h to a higher value (at least 7).