Hi, James,
That seems to be the same as what I'm doing (except I'm using ttyAM1), but
whatever I do, the read call appears to be blocking. (The write is working
okay.) I specifically open specifying non-blocking. I'm also using the
termConfigRaw routine supplied by Michael Schmidt which sets the following
parameters:
newtio.c_cc[VTIME] = 0; /* inter-character timer unused */
newtio.c_cc[VMIN] = 0; /* nonblocking read */
I've used two separate programs, one which just opens the file for read, and
one which outputs to ttyAM1, then goes into a tight-loop reading (which I'd
adjust later once I found out how the input ACK/NACK from the controller board
were coming back). But both block on the first read.
If you have any suggestions, I'd be tickled pink. Thanks for the time you've
spent with me.
Steve Hollingsworth
---- James Bridson <> wrote:
> Steve,
>
> Unfortunately the actual code belongs to a customer development so I
> cannot share it directly but if you ask me a specific question I will do
> my best to answer it (mail me offline unless you think the whole list
> will be interested). Essentially, on the TS-7250, I open the device
> (/dev/ttyS1 on this board), read the current attributes using tcgetattr,
> set the baud rate using cfsetispeed/cfsetospeed, set the attributes to
> local/raw mode (i.e. no input or output processing) (tcsetattr) then use
> the TS ioctl to select RS485HD mode and off you go. It is slightly
> different on the TS-7800 since the ioctl does not seem to be present so
> I write directly to the tsuart control registers using mmap.
>
> Regards,
>
> James
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|