Re: [ts-7000] read from a com port besides com 1 in c & why does /dev/pts/0 change to pts/1 ?

[john <>]

Jim Jackson wrote:

 

Try reading up on what /dev/pts is. It's all about PSEUDO TERMINAL
stuff.

What PHYSICAL port are you using? Try using that.

xuart0.
u have to use xuartctrl to make it available.
 I just got a code fix from technologic, thank you Deric Hildreth that fixes a problem with this uart, for the version of software that I have.  He is using the same scheme of echo to the port and cat back to initially test it.  So am optimistic.

google is your friend, e.g.

http://linux.die.net/man/4/pts

and reading and writing to serial ports try

http://www.faqs.org/docs/Linux-HOWTO/Serial-Programming-HOWTO.html

Yes, the reason I posted my question is in fact I already went their, tried code that was ok on my desktop using ttyS0, but did not work on the TS7500 /dev/pts/0

. 

On Tue, 17 Nov 2009, john s wrote:

> Having trouble reading from uart com ports in c (or bash for that matter)? I need to keep com1 as a terminal. I know I have seen posts about this and in particular the why /pts/0 changes to /pts/1 even tho i am not aware i added a new port. But I cant find one now.
>
> I have been able to setup a comport using xuartctl.
>
> I am able to echo > 'sometuff\r' > /dev/pts/0 and see the 'somestuff' appear on hyper terminal. And do the same thing in c.
>
> But I have not been able to do a cat and see anythng typed into hyperterminal. Worse still, I ran an example c program from the web and when it closed the fd for /dev/pts/0' it seems that the xuartctl for port 0 now referred to /dev/pts/1.
>
> Is there an example c program that is ok? Should i be using tcsetattr or just depend on the port being configure ok per the xuartctl command?
>
>

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