LAUNCHXL-F28027: How is the InstaSpin GUI composer communicate with the firmware on LAUNCHXL-F28027 to run the system?

You're referring to the InstaSPIN Universal GUI? It uses the debug probe connection to access the variables in the application. So in the case of the LAUNCHXL-F28027 it's through the onboard XDS100.

Whitney

Hi Whitney,

Thank you, 

-Micahel