Re: tcdrain / TCSBRK / wait_until_sent delay

[Andy Parkins <andyparkins@gmail.com>]

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On Friday 06 May 2005 20:14, rich+ml@lclogic.com wrote:

Thanks for your response.

> It only kicks in for sub-1200 baud.

Oh dear.

> In any case linux is not an RTOS, it does not guarantee maximum latency,
> so no matter what you are going to be intermittent at best.

I appreciate that, I was disappointed because I know that some other people 
are doing this on Windows and I assumed Linux would be able to kick a**.  
Considering the magic that Linux can do elsewhere, it didn't seem 
unreasonable to expect 9600 half duplex.  :-(

> Have you tried hardware flow control, "stty crtscts < /dev/ttyX"?.  With
> CTS strapped high, RTS should follow THRE||TE.

That's an interesting idea - CTS is currently set by the RS485 converter to 
indicate when it has successfully turned the buffer around.  So it goes, RTS 
set high, wait for CTS, send...  Is what you're suggesting that I cut this 
wire and hold CTS high externally?

Andy

-- 
Dr Andrew Parkins, M Eng (hons), AMIEE


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