nRF Connect RSSI Viewer - connect to nRF21540

[AMarch01]

Is there a way to convert the firmware for the nRF Connect RSSI viewer to work on the nRF21540DK. I imagine it isn't too difficult, since it is essentially the nrf53840 but with the addition of the front end. 
I am guessing a few lines of code to enable the front end and switch to receiver mode.

Perhaps it just works as is and I should plug it in and check it out.

What about modifications to work the nrf5340-dk?

A M

[Hung Bui]

Hi Anthony, 
I don't think adding a FEM is a problem with the RSSI viewer firmware. However currently the RSSI Viewer can only be used with nRF52 board. You can find the source code for the firmware on the nRF52 here: https://github.com/NordicSemiconductor/pc-nrfconnect-rssi/tree/main/fw/src

The reason for that is that the firmware was developed in nRF5 SDK not nRF Connect SDK. And nRF5 SDK doesn't have the full support for nRF53. 
I think there are 2 options here, one is to use the FEM with a nRF52 DK. Another option is to write your own firmware for nRF21540DK based on what you see in the code. You just need to study the UART protocol between the application on PC and the firmware. 
The source code for the application on PC is also provided in the same Github repo. 

[AMarch01]

It kind of looks like I need to add the nrf21540 board to the list of known boards in the application too. Unfortunately, my ability to program in typescript it Nil. 
oh well, thanks for the information.