chore: move mcs51 lib to lib

lib/mcs51/serial.h

@@ -0,0 +1,35 @@
+/*-------------------------------------------------------------------------
+   serial.c - this module implements serial interrupt handler and IO
+              routinwes using two 256 byte cyclic buffers. Bit variables
+              can be used as flags for real-time kernel tasks
+
+   Copyright (C) 1996, Dmitry S. Obukhov <dmitry.obukhov AT gmail.com>
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+void serial_init (void);
+void serial_interrupt_handler (void) __interrupt 4 __using 1;
+void serial_putc (unsigned char);
+unsigned char serial_getc (void);
+void autobaud ();