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Trammell Hudson committed d19de1a Draft

Correct sense of UDRE1 -- serial console works!

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 				usb_serial_putchar(key);
 #else
 				// Normal, send it serial
-				while (bit_is_set(UCSR1A, UDRE1))
+				while (bit_is_clear(UCSR1A, UDRE1))
 					;
 				UDR1 = key;
 #endif