Hello, My end goal is to use the USART interrupt service routine to retrieve data and save it into the SRAM for processing in the main loop. However, using Serial.begin(9600) gives me this error. HardwareSerial0.cpp.o (symbol from plugin): In function `Serial': (.text+0x0): multiple definition of…

Multiple Definitions Error when Using ISR(USART0_RX_vect)

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