Thanks ynezz
of sure, whitout my code is difficult understand.... but the realy question is
out about my code.
Suppose to want to get up gprs connection using built in commands pon and poff.
They open the /dev/ttyAM0 as you configure in /etc/..., normally with the
hardware flow control enabled. This does not work because DTR and RTS have the
polarity inverted.
Roberto
--- In Petr ©tetiar <> wrote:
>
> r_bergo <> [2011-02-21 10:54:41]:
>
> > For other questions, now I need to upgrade kernel to 2.6 and I got this
> > unaspected problem:
> >
> > - on /dev/ttyAM0 closed RTS and DTR are at logic level 1 (active)
> > - on /dev/ttyAM0 open RTS and DTR are at logic level 0 (not active)
> >
> > It seems works in inverted mode. Calling fopen() they go down and calling
> > fclose() they works!!!
>
> Without the actual code it's hard to help you, but take a look at HUPCL[1] and
> the source code of the serial driver[2] what it's doing.
>
> Simply said, if the baudrate is set than DTR/RTS is asserted on open(), if
> HUPCL is set, than RTS/DTR is deasserted on close().
>
> 1. http://lxr.linux.no/linux+v2.6.37.1/drivers/tty/tty_port.c#L368
> 2. http://lxr.linux.no/linux+v2.6.37.1/drivers/tty/tty_port.c#L248
>
> -- ynezz
>
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