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Re: Zephyr x nRF52 Inquiry

lairdjm
 

Hi David,

You can package them up using nrfutil so that they can update over the old Nordic SDK bootloader, you would just need to adjust the kernel load offset to after the softdevice and you wouldn’t be able to erase the softdevice, and would then use nrfutil like you would packaging a Nordic SDK application. The issue you have is that you’re using an nRF52832 with 512 or 256KB of flash and the current S132 softdevice uses 152KB of flash, the bootloader was 48KB or so if I remember rightly so that’s 200KB of 256/512KB flash used, to which you want to add a zephyr application with it’s own Bluetooth stack… Depending on the application and if you have any non-volatile data, you might find there is insufficient space for it to fit.

Thanks,

Jamie

 

From: David Rances <david@...>
Sent: 03 May 2021 14:30
To: Jamie Mccrae <Jamie.Mccrae@...>
Cc: devel@...
Subject: Re: [Zephyr-devel] Zephyr x nRF52 Inquiry

 

Hi Jamie,

 

Thanks for the response.

 

Does that mean that if I have devices out in the field running firmware built on older Nordic code (SoftDevice and nRF52 SDK), the only way to get firmware built on Zephyr onto those devices would be to bring them in and physically erase/flash them? Since any existing methods to update the bootloader/application would be dependent on tools from Nordic that utilize the SoftDevice (OTA DFU) or their serial DFU using SLIP.

 

Best,

David

 

On Fri, Apr 30, 2021 at 4:51 PM Jamie Mccrae <Jamie.Mccrae@...> wrote:

Hi David,

Zephyr does not use the Nordic SDK softdevice, it comes with its own Bluetooth stack which gets compiled into your application hex file. You would get rid of the code on your module and flash just the zephyr hex file, or you could also flash mcuboot if you want a boot loader.

If you are using the nRF connect SDK which uses zephyr then the ‘softdevice’ mentioned there has no relation to the Nordic SDK softdevice, it is Nordic’s proprietary lower link layer Bluetooth stack but similar to if using the one in zephyr, it gets statically linked to your output application and so you do not need the Nordic SDK softdevice

Thanks,

Jamie

 

From: devel@... <devel@...> on behalf of David Rances via lists.zephyrproject.org <david=strongarmtech.com@...>
Sent: Friday, April 30, 2021 8:54 pm
To: devel@...
Subject: [Zephyr-devel] Zephyr x nRF52 Inquiry

 

Hi,

 

I've got a question regarding Zephyr for nRF52 devices. I have an nRF52832 device with an old application firmware and bootloader that is utilizing an older version of SoftDevice (v5) and SDKv14.2 from Nordic. I'm currently building an application with Zephyr right now to target the same hardware. Would I need to update the SoftDevice version on the device first in order for my Zephyr application to run? What SoftDevice version is the current Zephyr running?

 

Thanks,

David

 

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David Rances   |   Embedded Engineer

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________________________

David Rances   |   Embedded Engineer

Email: david@...

Cell: +1 917 476 3696


NOTICE: This email and its contents/attachments may be confidential and are intended solely for the individual to whom it is addressed. If you are not the named addressee or if this email is otherwise received in error, please immediately notify the sender without reading it; do not take any action based on its contents or otherwise copy or disclose it to anyone, and note that any review, reliance or dissemination of this communication is expressly prohibited.  Any opinions or views expressed in this transmission are solely of the author and do not necessarily represent those of StrongArm Technologies Inc. or its affiliates.
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