Re: [patch 3/4] new serial flow control

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Hi,

I'm re-opening a somewhat old thread about serial flow control methods:

Russell King, le Wed 05 Jan 2005 23:53:01 +0000, a écrit :
> we have other people
> who want to use their on-board hardware RS485 flow control options on
> UARTs for their application, which means we need an RS485 flow control
> method.  (They can't select it without accessing the hardware directly.)
> 
> So, we now seem to have:
> 
> 	Standard flow control
> 	CTVB flow control
> 	RS485 RTS flow control

Let's add a new one: Inka braille devices, which uses RTS/CTS as
acknowledge strobes for each character.

> I still believe that flow control should be enabled by CRTSCTS, but
> the flow control personality set by other means.
> 
> Therefore, I think this requires further discussion, especially with
> Alan (who seems to be the tty layer god now) to work out some sort of
> reasonable interface.

How could this look like in userspace? Something like

#define CRTSCTS_RS232 0
#define CRTSCTS_RS485 1
#define CRTSCTS_TVB 2
#define CRTSCTS_INKA 3
	int method = CRTSCTS_RS485;
	ioctl(fd,TIOCMSFLOWCTRL,&method);

(and the converse TIOCMGFLOWCTRL)?

Regards,
Samuel
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