Re: [ECOS] SLIP and the eCos net package

[Nick Garnett <nickg at ecoscentric dot com>]

Øyvind Harboe <oyvind.harboe@zylin.com> writes:

> > The testing failure was simply that the wrong serial port was being
> > used. PPP needs hardware flow control to work efficiently, and a port
> > without the necessary connections was being used.
> 
> Ouch!
> 
> The hardware I'm working with does not have HW flow control.
> 
> Is this a trainwrecker?

Nope. You can still use software flow control: XON/XOFF. It's just not
quite as efficient since it relies on in-band signalling on the serial
data stream and is therefore subject to things like interrupt latency
and FIFO depths that RTS/CTS is not.

The testing problem was simply that we were testing a system
configured to use RTS/CTS on hardware that didn't support it. So it
all just ground to a halt waiting for a CTS that never came. If we had
configured for XON/XOFF, it would have all worked perfectly.

-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com      The eCos and RedBoot experts


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