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