RE: Switching GPIO pin between input and output mode

witc — Sat, 19 Nov 2022 13:13:49 GMT

Thank you very much!

Unbelievable how helpful this forum is :-)

RE: Switching GPIO pin between input and output mode

Naeem Maroof — Wed, 09 Nov 2022 15:12:00 GMT

Hi,

Thank you for your patience.

So basically your query is regarding configuring GPIO pin as input and output.

As per your provided information, I created a sample project and added the overlay.

I was able to configure a pin (in my case P0.26) as an input pin, set an interrupt on it, disable the interrupt and configure it as an output port.

I am attaching my setup (main.c and overlay) here.

I can read the status of GPIO pins using nrfjprog command-line tool.

GPIO0 base address is 0x50000000

And the offset of DIR (direction either input or output) register of GPIO is 0x514.

You can see here in the attached image that I am reading once from the DIR register when the pin is configured as INPUT, and the next time when the pin is configured as OUTPUT.

After checking the values read, you can see that our pin (P0.26) direction bit values are changing from 0 to 1, which means first it was configured as input, and now (at the later stage of code) as output.

Snapshot attached for clarification:

Source file: devzone.nordicsemi.com/.../66434.main.c

Overlay: devzone.nordicsemi.com/.../3755.nrf52840dk_5F00_nrf52840.overlay

Hope it helps,

Regards,

Naeem

RE: Switching GPIO pin between input and output mode

Naeem Maroof — Tue, 08 Nov 2022 15:53:00 GMT

Hi,

Thank you for contacting DevZone at NordicSemi.

This ticket has been assigned to me, and I will look into this case and update you accordingly.

Regards,

Naeem