RE: [ECOS] Serial overruns

["David Airlie" <David dot Airlie at parthus dot com>]

>
> I made the ROMRAM patches that I contributed back for that reason
> (Jonathan?? :-)

*hide*.. just noticed that stuff is in there :-)...

apologies..

Dave.

>
> Dave.
>
> >
> > In your case, I would suggest perhaps trying the interim buffer approach.
> > What platform are you using?
> >
> > Regards,
> >
> > Robert Cragie
> > Design Engineer
> > Jennic Ltd.
> > Furnival Street
> > Sheffield
> > S1 4QT
> > United Kingdom
> > Tel: +44 (0) 114 281 4512
> > Fax: +44 (0) 114 281 2951
> > mailto:rcc@jennic.com
> > http://www.jennic.com
> >
> >
> > > -----Original Message-----
> > > From: ecos-discuss-owner@sources.redhat.com
> > > [mailto:ecos-discuss-owner@sources.redhat.com]On Behalf Of Matt Holgate
> > > Sent: 17 September 2001 18:33
> > > To: ecos-discuss@sources.redhat.com
> > > Subject: [ECOS] Serial overruns
> > >
> > >
> > > Hi,
> > >
> > > I have a very simple application with two threads - one that reads from a
> > > serial port into a circular buffer (the producer), and the other that
> > > writes the data back out to the same serial port from the buffer (the
> > > consumer). The effect should be that any data sent over the serial line is
> > > echoed back. Mutexes and condition variables are used to synchronise the
> > > two threads and protect the shared buffer.
> > >
> > > The program runs fine if send a small amount of data down the serial line.
> > > However, if I send more than 16 characters (the size of the FIFO in the
> > > UART), then I get buffer overruns and only receive the first 16
> > > characters.
> > >
> > > I've enabled hardware flow control, although I'm pretty sure the problem
> > > is that the serial DSR is not responding in time to keep up with the data
> > > rate (only 38400 baud), rather than the eCos buffer overflowing (it is set
> > > to the default size of 128 bytes).
> > >
> > > I've no idea what the problem is, so any suggestions would be much
> > > appreciated!
> > >
> > > thanks,
> > > Matt
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
>
>

-- 
      David Airlie, Software Engineer, Parthus Technologies plc.,
       Mary Rosse Centre, National Tech Park, Limerick, Ireland.
   t: +353-61-508116 / f: +353-61-508101 / David.Airlie@parthus.com