nRF9160 DK I/O expander

RE: nRF9160 DK I/O expander

helsing — Fri, 26 Feb 2021 13:09:39 GMT

There was a new nRF Connect SDK tag, v1.5.0, released yesterday, with support for the I/O expander, PCAL6408A.

Please check out the updated documentation on Working with nRF9160 DK.

There has also been added functionality for selecting board revisions. The board revision feature must be enabled in order to make use of the I/O expander. Check out the description under Board Revisions.

RE: nRF9160 DK I/O expander

helsing — Fri, 26 Feb 2021 12:42:23 GMT

Hi Kevin,

I am not sure what exactly you are asking for. Perhaps you could create a new case and give a little background information, explaining what you would like to achieve?

Best regards,

Håkon

RE: nRF9160 DK I/O expander

KevinA — Thu, 25 Feb 2021 19:20:58 GMT

@helsing any update on getting the nRF52840 to work? Earlier today I was trying to get connected to the nRF52840 with an app figuring that was how Nordic had setup the control of the external memory and I/O but I couldn't find the nRF52840 and there is nothing about access the I/O or memory other then it exist.

RE: nRF9160 DK I/O expander

helsing — Fri, 15 Jan 2021 12:37:14 GMT

Hi Francis, I now have an update from our DK team: As of now we do not have any driver or support available for the I/O expander in nRF Connect SDK. Support for the device is planned, however, I do not have any specific date for when this will be implemented.

Please refer to the already mentioned driver for nRF5 SDK as a reference for how to operate the I/O expander. Please also let us know if you have any other questions regarding how to set up the board as you are going forward.

RE: nRF9160 DK I/O expander

helsing — Thu, 07 Jan 2021 15:09:17 GMT

I am not yet at the bottom of this. Here is what I am looking into at the moment: This section about the Board controller should provide some clues. It looks like the way to configure the I/O expander is to change the CONFIGs of the nRF52840 firmware. Also take a look at the nRF9160 DK board control sections showing possible routing.

RE: nRF9160 DK I/O expander

helsing — Wed, 06 Jan 2021 13:35:40 GMT

Thank you for the explanation. I am looking for a solution.

RE: nRF9160 DK I/O expander

Francis S — Tue, 05 Jan 2021 11:49:52 GMT

I am working on a client demo using the nRF9160 DK. The demo includes an arduino relay board with required pins same as the led's, slider and buttons on the DK. To enable the arduino board I had to configure the arduino config on the pins. (CONFIG_BOARD_NRF9160DK_LED1..4_ARDUINO=y...)

This leaves me with no led's or input to complete the demo.

RE: nRF9160 DK I/O expander

helsing — Tue, 05 Jan 2021 10:51:36 GMT

Thanks.

How do you intend to use the I/O expander? Is your goal to operate and interact with the LEDs, slide switches and buttons? Or are you looking for detailed control of the I/O expander itself?

If the goal is to operate the LEDs, slide switches and buttons then basic Zephyr samples such as Blinky and Button are available. The button and LED definitions of nRF9160 DK can be found in boards/arm/nrf9160dk_nrf9160/nrf9160dk_nrf9160_common.dts.

RE: nRF9160 DK I/O expander

Francis S — Tue, 05 Jan 2021 06:03:16 GMT

Hello Håkon

I plan to use the I/O expander from nRF9160.

RE: nRF9160 DK I/O expander

helsing — Mon, 04 Jan 2021 21:55:25 GMT

Hello Francis,

I will check if anything else is available. Will you be interfacing the I/O expander from nRF9160 or from nRF52840? So far I have only found the PCAL6408A driver for nRF5 SDK, v17.0.2.

Best regards,

Håkon