Wait function?

Lawrence Said said:

Does a wait function exist

No.
SImply because the MSP does not have a unique timebase. It doesn't know about milliseconds. Only the one who programs the clock module knows what requencies are in use.

There is a compiler intrinsic ( __delay_cycles()) that adds a delay of a given nubmer of CPU cycles, but how much a CPU cycle is again depends on the configuration.

So it's up to you to write a delay function that fits your clock configuration.

Hint: Timers are good in counting clock cycles.