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ee46686fb6
Many modern RS-485 serial devices such as the ones from FTDI already operate in RS-485 mode by default and will work with tio out of the box. However, there are some RS-232/485 devices which need to be switched from e.g. RS-232 to RS-485 mode to operate accordingly on the physical level. This commit implements the switching mechanism and interface required to enable RS-485 mode. It only works on Linux and with serial devices which use device drivers that support the Linux RS-485 control interface. The RS-485 feature is detailed via the following options: --rs-485 Enable RS-485 mode --rs-485-config <config> Set RS-485 configuration Set the RS-485 configuration using the following key or key value pair format in the configuration field: RTS_ON_SEND=value Set logical level (0 or 1) for RTS pin when sending RTS_AFTER_SEND=value Set logical level (0 or 1) for RTS pin after sending RTS_DELAY_BEFORE_SEND=value Set RTS delay (ms) before sending RTS_DELAY_AFTER_SEND=value Set RTS delay (ms) after sending RX_DURING_TX Receive data even while sending data If defining more than one key or key value pair, they must be comma separated. Example use: $ tio /dev/ttyUSB0 --rs-485 --rs-r485-config=RTS_DELAY_AFTER_SEND=50,RX_DURING_TX
27 lines
962 B
C
27 lines
962 B
C
/*
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* tio - a simple serial device I/O tool
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*
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* Copyright (c) 2022 Martin Lund
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#pragma once
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void rs485_parse_config(const char *arg);
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int rs485_mode_enable(int fd);
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void rs485_mode_restore(int fd);
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void rs485_print_config(void);
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