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C51: using

Hello,
I have Silabs 8051f120-DK.
I am making an interactive project between the MCU and a UI program written in VB.NET on a PC. The MCU receives a char and executes a procedure accordingly, i.e reading from ADC port.
Right now I am trying to debug a problem that I am having and I can't continue until I resolve this.
The code:
https://uploadfiles.io/cfde7 (Sorry about that, too many characters)

Notice what I am doing in main.

This is what the user see:
postimg.org/.../

Thanks, any enlightenment would be appreciated.

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