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Add experimental RS-485 support

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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
This commit is contained in:
Martin Lund 2022-09-10 15:20:42 +02:00
parent a58d406a3c
commit ee46686fb6
13 changed files with 351 additions and 11 deletions
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36
man/tio.1.in
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@ -229,6 +229,33 @@ response mode to make it easy to parse the response.
Set timeout [ms] of line response (default: 100).
.TP
.BR " \-\-rs\-485"
Enable RS-485 mode.
.TP
.BR " \-\-rs\-485\-config " \fI<config>
Set the RS-485 configuration using the following key or key value pair format in
the configuration field:
.RS
.TP 30n
.IP \fBRTS_ON_SEND=value
Set logical level (0 or 1) for RTS pin when sending
.IP \fBRTS_AFTER_SEND=value
Set logical level (0 or 1) for RTS pin after sending
.IP \fBRTS_DELAY_BEFORE_SEND=value
Set RTS delay (ms) before sending
.IP \fBRTS_DELAY_AFTER_SEND=value
Set RTS delay (ms) after sending
.IP \fBRX_DURING_TX
Receive data even while sending data
.P
If defining more than one key or key value pair, they must be comma separated.
.RE
.TP
.BR \-v ", " \-\-version
@ -358,6 +385,10 @@ Set prefix ctrl key (a..z, default: t)
Enable wait for line response
.IP "\fBresponse-timeout"
Set line response timeout
.IP "\fBrs-485"
Enable RS-485 mode
.IP "\fBrs-485-config"
Set RS-485 configuration
.SH "CONFIGURATION FILE EXAMPLES"
@ -507,6 +538,11 @@ Likewise, to pipe data from file to the serial device:
$ cat data.bin | tio /dev/serial/by\-id/usb\-FTDI_TTL232R-3V3_FTGQVXBL\-if00\-port0
.TP
Enable RS-485 mode:
$ tio --rs-485 --rs-485-config=RTS_ON_SEND=1,RX_DURING_TX /dev/ttyUSB0
.SH "WEBSITE"
.PP
Visit https://tio.github.io