MSPM0G3507: Need Example to dynamically change Pin Function on MSPM0 series CPU at runtime.

Looking for an example of how to change pin use temporarily at runtime. EG: when a pin was originally configured as a Output Pin but need to flip back and forth between input and output at runtime for a RC circuit.  I can do this with most other CPU and other SDK but could not find documentation on how to do it with the MSPM0 without RTOS.

In this application I need first to convert the and OUTPUT and drive it LOW to discharge a variable capacitor.  Then I want to convert it back to input feeding the OP AMP - (inverting input) to record how long it takes charge the capacitor.   I can do it with a external pchannel mosfet but this is easy for both the ATMEL Tiny CPU running bascom and the ESP32 running Arduino. 

I need this to work on both a MSPM0L1306 and MSPM0G3507.

I would also love a example of changing the PIN MUX config at runtime so I could switch to different input pins to feed the OpAmp1 - inverting input.  

These examples would be best if shown how to accomplish this without the RTOS.