Thanks for technical information !
I'm only trying to use only one uart to receive NMEA data (GPS, at 4800) an=
transmit to a pc, at higher speed (like 115200, GPS data and other stuff)
In fact, I don't need it (no simultaneous use), but I thought it would have
been useful in the future.
No matter, I'll use bluetooth !! :D
On 1/30/06, Alexandre Pereira Nunes <alex@...> wrote:
> Dave Hylands escreveu:
> >Hi J=E9r=F4me,
> >>Does anybody know if it is possible to set different ispeed and ospeed
> >>serial devices ?
> >>cfsetispeed and cfsetospeed seem to be useless on my termios structure.
> >I think that having separate input and output speeds is largely a
> >legacy support thing. As far as I can tell Linux doesn't actually
> >support different input and output baud rates.
> Yes, that's not standard these days. IIRC 16550-compatible uarts (the
> most used on pcs) have a clock divider and polling mechanism which makes
> it impractical to have asymmetrical I/O speeds. PXA core uarts seems to
> be even simpler, but HWUART seems to have different semantics and I
> didn't look at it.
> Microcontrollers I've seem also have the same design.
> I'm not sure what you (J=E9r=F4me) are trying to do (i.e. what are you
> trying to hook at the other side of gumstix) but you left me wondering.
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