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/*
* Reading from and writing to an RS-232 port
*
* This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
* Published under the terms of the MIT License, as stated below.
*
* Copyright (C) 2015-2022 Mateusz Viste
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef MDR_RS232_H
#define MDR_RS232_H
/* get the I/O port for COMx (1..4) */
unsigned short rs232_getport(int x);
/* check if the COM port is ready for write. loops for some time waiting.
* returns 0 if port seems ready eventually, non-zero otherwise. can be used
* to verify the rs232 presence */
int rs232_check(unsigned short port);
/* write a byte to the COM port at 'port'. this function will block if the
* UART is not ready to transmit yet. */
void rs232_write(unsigned short port, int data);
/* read a byte from COM port at 'port'. returns the read byte, or -1 if
* nothing was available to read. */
int rs232_read(unsigned short port);
#endif