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#define SERIAL_PIN_DDR DDRD #define SERIAL_PIN_PORT PORTD #define SERIAL_PIN_INPUT PIND #define SERIAL_PIN_MASK _BV(PD2) #define SERIAL_PIN_INTERRUPT INT2_vect #define SERIAL_SLAVE_BUFFER_LENGTH MATRIX_ROWS/2 #define SERIAL_MASTER_BUFFER_LENGTH 1