Problem with COM

[Duško Rusmir]

Dana ponedeljak 11. februar 2002. 19:46 napisali ste:
> On Mon, 11 Feb 2002, [utf-8] Duško Rusmir wrote:
> > No at all 38400 : 20 = 1920
> > Right is 115200 : 20 = 5760
> > 5760 don't work although it is a possible dividor 20!
>
> I think you misunderstand me.  The baud_base of a 16550a _is_
> 115200. There is no way for setserial to change it.  It is not
> progammable. You are allowed to change it in case you have some
> other hardware, but if you do, you only make the comm driver
> calculate the wrong divisor for whatever speed the app asks for,
> and generally confuse everyone.
>
> In this example, I set the baud base to 38400, open the comm
> port at 38400, and the actaul DTE speed reported by the modem is
> 115200. Then I use a speed of 19200, and the DTE speed is 57600.
>  Unfortunately, neither of my modems will work at 5760, so I
> can't show you exactly that
>
> with a baud_base 115200 spd_cust divisor 20
> 38400 is really 5760.  19200 is 19200.  57600 is 57600.  but
> 38400 is 5760.

> > 9600 works also fine.
> > 115200 : 12 = 9600 but it works whit 115200 and divisor 0!!!
>
> The serial driver only uses divisor when the comm port is opened
> at 38400 and the spd_cust flag is set.  otherwise it calculates
> a divisor
>from speed and baud_base.

All Right, I have unterstand.

> > Yes, I can't get 5726 from 38400, 57600 or 115200 at all, but
> > it works in Windoze very well. I think it is a Way to get
> > 5726, but Gates don't give the source.
>
> Windows might give the appearance of working at 5726, but I bet
> it is really using 5760 or 7200 or something.

Yes, app want 5726 I write 38400, app got 5760 and work!

> > I have tryied some possibility.
> > Take a Look on Attachment Wine-COM.tgz, please.
> >
> > Thanks much, I am waiting for resolution.

I think I have the Solution.

Make two scripts:

first for 5760: baud_base 115200, spd_cust divisor 20, call 38400 
from app

"setserial /dev/ttyS0 baud_base 115200 spd_cust divisor 20"

second for 9600:  baud_base 115200, spd_cust divisor 0, call 9600 
from app

"setserial /dev/ttyS0 baud_base 115200 spd_cust divisor 0"

Put one in /etc/init.d/boot.local and if I which others Baudrate 
call others script.

> AFAICT, you didn't try it the way I suggested.
>
> baud_base 115200 spd_cust divisor 20
> _and_
> ... baudrate 38400
> in one of the logs.

Yes I have forgotten this, but now I have tried and have got 
success with 5760.

Take a Look on Attachment Wine-COM1.tgz, please.

Thanks many for Yours Help, this is very nice from You.

-- 
MfG / With best Regards
Rusmir Duško
Registered Linux user: #130654 http://counter.li.org

-------------- next part --------------
A non-text attachment was scrubbed...
Name: Wine-COM1.tgz
Type: application/x-gzip
Size: 3669 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-users/attachments/20020211/1c43c490/Wine-COM1.bin