The constructor for HardwareSerial accepts a uint8_t parameter "txen". The instantiation at the bottom of HardwareSerial.cpp passes that parameter like this: HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRRH, &UBRRL, &UCSRA, &UCSRB, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X); I'm trying to modify Har…

TXEN in HardwareSerial.cpp - Where is it defined?

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