I am just getting started with the TS7500 (but will be using the T7550 for
production).
--- In "jongsoo_k" <> wrote:
>
> I am reading the example of xuartctl in software guide for TS 7550.
>
> It uses two RS232 port, console and xurt0.
>
> From console, the following command is issued so than console program is
> connected to xurt 0.
> # xuartctl --port 0 --server
> # xuartctl --port 0 --server --speed 115200
> ttyname=/dev/pts/0
>
I don't think this is right. The console and xuart0 are not the same. The
first command and second commands are the same apart from the specification of
the speed. Because --port and --server are both used, a pseudotty is
allocated. If you do this early in the boot or application startup, it will
consistently get /dev/pts/0.
> I have a few questions.
> 1) I understand since the command " xuartctl --port 0 --server" is issued
> from the console, xuart 0 is connected with console. If a program ( not
> console) issues this command, then xuart 0 port will be connected with the
> program ( whatever it is). Am i correct?
Again, not right. It will connect /dev/pts/0 to xuart0.
>
> 2)In software guide, i read below
> [The xuartctl utility will always choose the first free device node. So,
> there may be instances where specifying "--port 0" will result in /dev/pts/1.
> This makes it difficult when programming for /dev/pts/0 specifically. One
> suggestion to overcome this is to create symlinks:
> ln -s /dev/pts/1 /dev/pts/0 ]
>
> This makes me concerned because i need to statically assign about 5-6 xuart
> device nodes statically to physical device ports not like choosing the first
> free node. I am not sure if the "ln" command can do the job. I appreciate
> any advice.
If you want to use several XUART, it might be easier to run xuartctl --server
at boot time. This will then create TCP ports at 7350 up to 7357. You could
simply open() and read() write() these ports instead of using pseudo ttys.
There is some subtlety in setting the buad rate, as the ioctl to set them
doesn't work on sockets. You can either run system("xuartctl
--speed=SOMETHING") or there is another way.
If you use popen, you can create a pipe you can read and write.
popen("xuartctl --port=0", "r+") for example.
Sorry I can't give exact details at the moment. I have found Technologic
Support helpful on matters regarding the xaurts, probably because the supplied
documentation is a little hard to understand.
Martin
>
> Thanks
>
> Jongsoo
>
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