Electronics

I am developing new electronic part for my future Prusa i3.
Is there some information about algoritm of transfer from computer to motherboard of 3D printer, I mean the code that is send thru the USB? I have an idea to make something like this: [reprap.org] .
I've chosen A3977SEDTR-T motor driver (best i can find here) it carries 2,5 A, not bad, i have 1.7 A motor, think it's enough.
I vont to make it as cheap as posible, an make it open source.
Sorry for my bad English :-(

i want to suggest you ,, should be buy the good,, electronics thigns, then you can make more valuabe things

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Is there some information about algoritm of transfer from computer to motherboard of 3D printer, I mean the code that is send thru the USB?

It's G-code in plain text: [reprap.org]

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Generation 7 Electronics	Teacup Firmware	RepRap DIY