Steve,
I've sent you a copy of a porting file from our MODBUS library. It is a
bit too much to post here in its fullness. This is our own IP (LeoTel
Software Systems). Feel free to adapt if it works for you and use it in
any way you want.
Regards,
James
-----Original Message-----
From:
Sent: Tuesday 12 February 2008 15:46
To:
Cc: James Bridson
Subject: RE: [ts-7000] Losing characters on TS-7800 tsuart port in
RS485HD mode
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
>
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