Running Zephyr on HolyIOT nRF52840 does not work (Solved)

RE: Running Zephyr on HolyIOT nRF52840 does not work (Solved)

Udayakiran Kallavi — Fri, 19 Feb 2021 17:01:04 GMT

This probably sounds silly, but I have a guess about how the board suddenly started working. I installed zmk and initialized it. It pulled another copy of zephyr and set the environment to that. Once again everything stopped working and the board did not respond.

Then I erased everything using nRF Connect, flashed SoftDevice 140 (7.2.0) to it, reset it. Then I again flashed the sample hex file I had built previously and it started working like magic. Just erasing all did not help, I had to flash SoftDevice. Even now I am not clear why that worked, but it did. Blinky has started blinking again! 🕺🏽

RE: Running Zephyr on HolyIOT nRF52840 does not work (Solved)

Udayakiran Kallavi — Thu, 18 Feb 2021 19:40:23 GMT

Looks like it was a combination of my rat's nest of a build environment, the need to reset the device after every flash and me editing the wrong configuration files that got me into this mess. GPIO works fine now. Some code is behaving oddly, but I guess that is for another day and another topic.

For now, all LEDs are blinking. 🙂

My apologies and thanks to whoever spent time reading through the post.

For anyone in a similar muddle, the nrf52840dongle_nrf52840_defconfig board file works fine for the HolyIOT 18010 module. 10059 board works fine in the Segger Embedded Studio samples. Cheers!

RE: Running Zephyr on HolyIOT nRF52840 does not work (Edited)

Udayakiran Kallavi — Thu, 18 Feb 2021 18:06:18 GMT

Further testing shows that it is not necessary to add these lines to the nrf52840dongle_nrf52840_defconfig file for this module:

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_250PPM=y

I guess there is an external oscillator provided on the board. Or it manages fine without it.

(And sorry about so many edits and replies. I am hoping this would provide as a reference to someone who might need it.)

RE: Running Zephyr on HolyIOT nRF52840 does not work (Edited)

Udayakiran Kallavi — Thu, 18 Feb 2021 17:50:10 GMT

I have no idea what got it working, but Bluetooth and USB now works. The device requires me to reset it (turn off the power, wait for a couple of seconds, turn it back on). So, in case anyone needs a confirmation whether the HolyIOT 18010 works with Zephyr, it does, with the board files I attached.

I still haven't figured out how to get GPIO working, but it is still some progress.