Problem with COM
drusmir at gmx.ch
Mon Feb 11 16:57:22 CST 2002
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
"setserial /dev/ttyS0 baud_base 115200 spd_cust divisor 20"
second for 9600: baud_base 115200, spd_cust divisor 0, call 9600
"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
> ... 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
Registered Linux user: #130654 http://counter.li.org
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