To disable the TRACE32 PowerView user interface, find the line starting with SCREEN= in your TRACE32 configuration file (default: config.t32) and change it to SCREEN=OFF. If there is no line starting with SCREEN= add a and empty line at the end of the file and then add the line SCREEN=OFF.
Then you can either start TRACE32 PowerView with a startup script which will contains the actions you want to perform or control the TRACE32 application from an external program (e.g. Python script or C application).
The TRACE32 application can be closed using the QUIT command, which can take the OS return value as argument.

Refer for more information to the TRACE32 Installation Guide and API for Remote Control and JTAG Access in C.