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How does the USB debugging emulator perform CIO?

Other Parts Discussed in Thread: TMS320F28335

Right now I''m using CIO for initial testing for a project. I'm currently trying to calculate memory usage (on TMS320F28335,) however, I am not sure how much memory is used on the chip when executing CIO function calls. I'm using fprintf/fscanf currently, but I don't know whether the USB emulator performs the ASCII to, in my case, float conversion or if the ASCII. What form is the data coming onto the board as, and do these functions use up a significant amount of memory? (I'm assuming that most of the memory used is coming from the stack or the CIO buffer, so I don't think it would cause any big problem, but I've been wrong before and want to double check.)