| /* | |
| * Simple wrapper for writing to a RS232 port. This file is part of the | |
| * DOSMid project. | |
| * | |
| * Copyright (c) 2015, Mateusz Viste | |
| * All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions are met: | |
| * | |
| * 1. Redistributions of source code must retain the above copyright notice, | |
| * this list of conditions and the following disclaimer. | |
| * | |
| * 2. Redistributions in binary form must reproduce the above copyright | |
| * notice, this list of conditions and the following disclaimer in the | |
| * documentation and/or other materials provided with the distribution. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| * POSSIBILITY OF SUCH DAMAGE. | |
| */ | |
| #ifndef RS232_H_SENTINEL | |
| #define RS232_H_SENTINEL | |
| /* 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 |