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Hi, Russell King, le Sun 09 Oct 2005 09:37:24 +0100, a écrit : > On Sun, Oct 09, 2005 at 02:21:30AM +0200, Samuel Thibault wrote: > > Russell King, le Sun 09 Oct 2005 01:01:53 +0100, a ?crit : > > > > How could this look like in userspace? > > > > > > I think they should be termios settings - existing programs know how > > > to handle termios to get what they want. > > > > Hence a new field in the termios structure? > > > > There was a discussion about this back in 2000: > > > > http://marc.theaimsgroup.com/?t=96514848800003&r=1&w=2 > > What I was thinking of was to use some of the spare termios cflag bits > to select the flow control. You'd only want one flow control type at > one time though. Eg: define two fields, each to select the signal. > > 0 - RTS > 1 - DTR > > 0 - CTS > 1 - DTR > 2 - DSR It looks fine, but it might not be sufficient for expressing that: - some flow control use RTS to indicate that DTE is ready to send data, - some other use it to indicate that DTE wants to send data. (and CTS is used for acknowledgment of this), - some other use it as a strobe for acknowledging characters, some other use it as a strobe for acknowledging frames (announced by CTS). > However, bear in mind that the majority of the more inteligent 8250- > compatible UARTs with large FIFOs only do hardware flow control on > RTS/CTS Hardward flow control is usually performed in software. Can't their hardware implementation of hardware flow control be disabled when control method is not usual RTS/CTS? Regards, Samuel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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