nRF52811 replacement over nRF52832 plug-and-play ?

[StephaneJ]

Hi,

Our entire board is running around a nRF52832. Recently it has been difficult to find some of these SOC. Is it safe to replace it with the nRF52811 without changing the board layout and the firmware ?

Thanks !

[ketiljo]

The pinout of the two is the same, so you can replace one with the other. But you need to re-compile the FW for the new device. Any radio certifications will have to be done again as well.

[StephaneJ]

Thanks for your quick answer ketiljo

I'm not sure to understand why I should re-compile the FW if the board is the same and the pinout are the same ?

[ketiljo]

The nRF52811 have less RAM, hence the placement of the stack will be different. Even if it's equal on the outside, there are differences in the inside. Memory mapping etc. 

[StephaneJ]

Sorry it has been few years since I compiled the original FW and I am not sure where I should define if it is for nrf52832 or nrf52811.

I am using SES for compiling. Is it on the Project Options --> Common --> Preprocessor --> Preprocessor Definitions ?

Here I see a preprocessor : NRF52832_XXAA

I just need to replace this with NRF52811_XXAA ?

Thanks !