First dock the Mini-Simplicity connectors onto your WSTKs are shown here:
Also connect your ribbon cable as shown. Then connect your Thunderboards on their corresponding 10 pin header. If your mini simplicity connectors do not have keyed headers, make sure to match your pin 1s of both 10 pin headers.
Since we are using Thurnderboards connected externally to our WSTKs, we must make sure our WSTKs are set to debug mode OUT. This can be done via commander. For each WSTK run the following command
commander adapter dbgmode OUT -s XXXXXXX
where XXXXXXX is the serial number of your WSTK.
This can also be performed within Studio from the Launcher perspective. Under the Debug Adapters pane near the top left, you should see the two boards/adapters show up as “J-Link Silicon Labs (4400xxxxx). Highlight each adapter and change the Debug Mode to “OUT”. If you are prompted to update the board firmware, please proceed with the update. Note that when the Debug Mode is OUT, Simplicity Studio does not know about the Thunderboard Sense 2 board anymore and this is expected. (WSTK main board is still recognized.)
Because neither of our applications will run without a bootloader, we want to create a bootloader for each. Fortunately, a default Gecko application bootloader will work for each board in this example.
To generate this bootloader:
Once your App Builder project opens, click the generate button to generate your project without any changes. Once the Generation successful window appears, you are done. Then use the Hammer icon on the toolbar to invoke your compiler and build your project. This will give you the binaries to flash onto your board. You will need to locate the file named -combined.s37, it should be located in your projects binary folder.
You should flash this application to each of your Thunderboards, making sure to erase each board as you do this. Because you are flashing an external part, it will ask you to use the device option (-d) to identify the part connected to your board, using EFR32 will be enough to proceed.
commander flash TB-app-BL-combined.s37 --masserase -s XXXXXXX -d EFR32
Once you have completed this, you will be ready to begin creating your projects.