nRF52833 Soc Supported Firmware works on nRF52840 Soc.

[Swapnil Karkare]

Hello,

We are using nRF52833 Soc and s140 soft device for our project. Application is scanning our proprietary Tags. We have Bootloader as well to support DFU.

Due to current chip shortage scenario we have explored nRF52840 Soc, which is pin compatabile as per our project requirements. 

During testing we have flashed nRF52833 firmware on nRF52840 Soc and it behaves same as nRF52833 Soc. We were able to see the tags.  As per datasheet Flash memory map is same for both of this chip expect bootloader and setting locations. As per my understanding, If we use nRF52833 Soc firmware on nRF52840 Soc, we are gone loose extra 512KB flash. Also currently we don't have any security related requirements. 

My question is, What are the points do we have to consider if we are using nRF52833 Soc firmware on nRF52840 Soc?

[Jørgen Holmefjord]

Hi,

It is not recommended to use a firmware built for another chip variant on your devices, unless the chip variants are listed as binary compatible. The chips may have different errata list which can affect/degrade the performance of the devices.

You should change the startup and system files in your project, change the chip variant in the preprocessor symbols, and rebuild the application with the correct chip variant.

Rebuilding the project with correct settings will also give you access to all the available features of nRF52840 chip (additional flash/RAM, Cryptocell HW accellerator, QSPI peripheral, etc).

Best regards,
Jørgen

[Swapnil Karkare]

Hi,

Thanks for clarification.

Could you please tell me, where i can find information related to binary compatible chip variants?