parallel I/O ports & opend darin pins on MPC8xx

[Wolfgang Denk]

In message <3F0C7782.3060704 at earthlink.net> you wrote:
>
> But I still don't see how you could avoid having other drivers clobber
> your output but.  I think he has to take one of the two options I

By modifying _all_ drivers that will modify the port in question in a
way that is based on previously read data.

> suggested.  Adding his own variable can't help in any way I can
> imagine.  Could you give an example?

Find out which port pin(s) is/are  configured  as  OD  output.  Check
which  other port pins on this port are in use, and which drivers are
using these port pins. Make all these drivers  use  a  common  buffer
variable. Voila...


Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
If a packet hits a pocket on a socket on a port,
And the bus is interrupted as a very last resort,
And the address of the memory makes your floppy disk abort,
Then the socket packet pocket has an error to report! - Ken Burchill?

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