Martin Lund ee46686fb6 Add experimental RS-485 support ... 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		2022-09-10 17:52:54 +02:00
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tiorc	Add experimental RS-485 support	2022-09-10 17:52:54 +02:00