RE: [ECOS] Serial getc problem

["George Sosnowski" <george@stratalight.com>]

I have come across a similar situation using the 860T. My platform has
one serial port (SMC1 used as diag and console port) and currently I
inherit the serial channel from redboot. Is it still possible to have a
'proper' /dev/tty0 that uses the inherited serial channel (diag/console)
from redboot? Or does the ecos ram image have to install its own
/dev/ser0 for console and diag channels since these are the same device?

Thanks,
George

-----Original Message-----
From: Robert Cragie [mailto:rcc@jennic.com] 
Sent: Thursday, July 04, 2002 10:26 AM
To: Daniel Lidsten; ecos-discuss@sources.redhat.com
Subject: RE: [ECOS] Serial getc problem

You need to use a 'proper' serial driver (/dev/tty0 or /dev/tty1), not
/dev/ttydiag. These allow blocking reads which will allow other threads
to
run; as you  have seen, /dev/ttydiag does a busy wait on a character
which
will stop other threads from running. You can configure eCos so that
stdio
uses /dev/tty0 or /dev/tty1.

Regards,

Robert Cragie, Design Engineer

Direct: +44 (0) 114 281 4512
________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
www.jennic.com  Tel: +44 (0) 114 281 2655


> -----Original Message-----
> From: ecos-discuss-owner@sources.redhat.com
> [mailto:ecos-discuss-owner@sources.redhat.com]On Behalf Of Daniel
> Lidsten
> Sent: 04 July 2002 17:19
> To: ecos-discuss@sources.redhat.com
> Subject: [ECOS] Serial getc problem
>
>
> Hi,
>
> I am running a MPC850 with a few different threads in the application.
> The network stack is also enabled and up and running. However, when a
> thread calls the HAL_DIAG_READ_CHAR to wait for input from the user
then
> my net stack stops working. I cant reach it with a ping from my local
> host.
>
> My first thought was that the application was running with a higher
> priority (lower value) then the net stack but that was not the case.
The
> application runs at prio 8 and net at 6 and 7 (background).
>
> I have seen in the serial driver that when reading a char from the
port
> then the following is done:
>
> while ( !getc_non_block(..) )
>
> Can the problem be that this code is running in some form of "kernel
> state" i.e. in a very high prio state since the driver lies within
eCos?
>
> Regards, Daniel
>
> --
> Before posting, please read the FAQ:
http://sources.redhat.com/fom/ecos
> and search the list archive: http://sources.redhat.com/ml/ecos-discuss
>
>


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