Firmware board configuration for nRF52833 QFN40 (QDAA) design

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

helsing — Fri, 29 Jan 2021 10:53:51 GMT

If you change the UICR, this code will be run before main(). The first time the code runs, the voltage configuration will change to 3V3 and the configuration is stored. From then on, every time you boot the IC, the voltage will already be configured and the condition of the if-statement is not met anymore. This method is already used by many of the system files in the MDK, such as when enabling pin reset by writing to the PSELRESET registers in the UICR: https://github.com/nrfconnect/sdk-hal_nordic/blob/master/nrfx/mdk/system_nrf52833.c#L136

I have created an internal inquiry so that hopefully this could be a CONFIG_ in the future.

Sorry for the long delays in this thread, I am still quite new at Nordic and I am learning as we go. I hope you get faster response from us the next time you have any questions.

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

optimisedpd — Fri, 22 Jan 2021 12:51:30 GMT

I'm fine with the changing a digit '0' to a '3' part, thanks!

The part I was looking for guidance on was that this approach was even the best method. There are also threads such as this that suggest it's best not to change the UICR at runtime https://devzone.nordicsemi.com/f/nordic-q-a/28562/nrf52840-regulator-configuration

Anyway I will take it as confirmation that the method I originally linked is the best approach, and most of the other questions are redundant now as it's been so long. This thread has been an exercise in futility so I'll leave it there.

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

helsing — Fri, 22 Jan 2021 12:11:59 GMT

Hi Kevin, sorry again for the delay.

LDO mode is the default behavior, so you do not need to change anything in order to use LDO. DCDC is only supported by REG1. LDO is the only option for REG0.

Regarding 3V3: Try running similar code. Except, where it says "3V0", try changing to "3V3".

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

optimisedpd — Thu, 14 Jan 2021 18:39:59 GMT

I need to move forward with this - the main thing is setting up the REG0 for 3V3 use and both REG0 & REG1 in LDO only mode. Please could you let me know what the best way of doing this is, is it similar to the linked example? Or is there a CONFIG_ value or better way of doing this? Thanks

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

helsing — Thu, 07 Jan 2021 08:54:41 GMT

Hi Kevin, thank you for your patience.

I will share a few thoughts soon.

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

optimisedpd — Tue, 05 Jan 2021 19:14:28 GMT

Hi, Any ideas?

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

helsing — Mon, 21 Dec 2020 15:51:27 GMT

Thank you for the update and new questions. I will look into this as well.

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

optimisedpd — Fri, 18 Dec 2020 15:26:58 GMT

Thanks Hakon, yes I have seen that, and slowly getting more familiar. I have got it working to a basic level now and worked out some of the things in my original question.

Your help on how to manage the different package (both the CONFIG_SOC_NRF52833_QIAA and the nordic/nrf52833_qiaa.dtsi file) would be much appreciated as I can't see anything online about this or any existing files for this package variant.

The other part which would be good to get your input on, is if the 'arduino_' parts can be removed. This may be more obvious to someone in the know, but I can't find much written on this specifically. I don't think I use anything arduino related, but wasn't sure if these are used under the hood, or are common in sample code which I might copy.

The final part is related to setting up REG0 for 3V3 use. So far I have added the two commands below to the 'customboard_nrf52833_defconfig' files to configure for our PCB.

# No LF XTAL on PT118A board, so use internal 32.768kHz RC oscillator
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

# No DCDC inductor on PT118A board, so disable (use LDOs)
CONFIG_BOARD_ENABLE_DCDC=n

Do these look like the correct way to do these changes, and how best to set REG0 to 3V3? I found the board_nrf52833dongle_nrf52833_init() function in this board file https://github.com/nrfconnect/sdk-nrf/blob/master/boards/arm/nrf52833dongle_nrf52833/board.c , but thought there must be a simpler way! Is there a CONFIG_ setting for this?

Thanks for all your help.

Kevin

RE: Firmware board configuration for nRF52833 QFN40 (QDAA) design

helsing — Fri, 18 Dec 2020 15:00:50 GMT

Hi Kevin

We have a getting started tutorial that you might have seen already which is touching on this.

I will look into the details you provided and get back to you after the weekend.

Best regards,

Håkon