ROM Hack GBA serial output

game16

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Hey, I want to make a LED panel. The display will be driven by an atmega and several LED drivers. But I need something else to do all the processing and input for any number of various games. Can the GBA do serial input and output to an atmega?

Is there any source code I can see? I'm only a beginner so I need code to look at
 

FAST6191

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