Line Discipline or Termios lacks ?

[Cedric Aubert]

Do you what I want, I can reimplement in my BSP the
console.c instead of use the console.c of
libbsp_shared but I want to knwon if it's was
possible to do this with another feature. :-)

--- Thomas Doerfler <Thomas.Doerfler at imd-systems.de>
wrote:
> Hello Cedric,
> 
> rtems termios has a feature to control the hardware
> handshake 
> lines (or, actually, only the RTS line) to signal to
> the 
> oposite side, that the receive buffer is almost
> full, or that 
> there is more space available. This features is
> available in 
> some console drivers, it depends on the
> implementation of the 
> "stopRemoteTx" and "startRemoteTx" hooks. 
> 
> If the hardware driver in use supports these calls
> and the 
> device has the CRTSCTS flag set, then termios will
> control the 
> hardware handshake output line RTS for you.
> 
> This has nothing to do with "line discipline". The
> "line 
> discipline" feature allows redirecting the character
> stream to 
> certain additional, external functions, that can do
> wierd 
> things like decoding the incoming character stream
> as PPP 
> packets and so on. 
> 
> If the functionality in termios for hardware
> handshake line 
> control is not sufficent for you, you might add
> "private" 
> functions to the "ioctl" function of your device
> driver, which 
> might in turn do whatever you want with the hardware
> handshake 
> lines of your devices.
> 
> wkr,
> 	Thomas.
> 
> 
> > Hi
> > 
> > I try to implement a full driver for my serial
> port.
> > Today that's work fine with the termios and
> console
> > shared functions but now I try to control by hand
> > my line's signal like CTS or RTS. (ex :
> > Get_CTS,Get_RTS)
> > But I can't find how to correctly implement this
> > feature.
> > 
> > I read some line discipline documentation and I
> found
> > that it's possible in rtems to implement a line
> > discipline like for ppp. If your have 2 different
> > hardware uart on your board you should have 2
> > functions to read the CTS value but you will have
> > only one line discipline (the termios_built_in).
> > 
> > But I understand that a line discipline should be
> > a shared discipline for all port. It doesn't
> depend of
> > the hardware UART.
> > 
> > So to implement driver depend read or write
> CTS/RTS
> > DSR or other, it should be in my hardware driver
> > and call be rtems_termois_ioctl.
> > 
> > rtems_termois_ioctl have a switch to do the
> > command and if it does known, it try to call the
> > line discipline_ioctl function.
> > 
> > So if line discipline isn't hardware depend how
> > can I do ?
> > 
> > Should I make a Termios evolution to call some
> other
> > command ?
> > 
> > Thanks a lot
> > 
> > 
> > =====
> > AUBERT Cedric
> > SDEL Controle Commande
> > rue Nungesser & Coli
> > 44860 St Aignan de Grand Lieu
> > 
> > E-mail : cedric_aubert at yahoo.fr
> > Http : http://www.controle-commande.sdel.fr/
> > 
> > __________________________________
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> --------------------------------------------
> IMD Ingenieurbuero fuer Microcomputertechnik
> Thomas Doerfler           Herbststrasse 8
> D-82178 Puchheim          Germany
> email:    Thomas.Doerfler at imd-systems.de
> PGP public key available at: http://www.imd-
> systems.de/pgp_keys.htm
> 


=====
AUBERT Cedric
SDEL Controle Commande
rue Nungesser & Coli
44860 St Aignan de Grand Lieu

E-mail : cedric_aubert at yahoo.fr
Http : http://www.controle-commande.sdel.fr/

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