Re: [lwip-users] cs8900 lost packets bug

[Leon Woestenberg]

Hello Paul,

> I'll track down the application / technical note for you,
> If you can trigger a break point after a transmit fails
> then this bug is affecting your system.
> 
> It would like to suggest that a processor/system agnostic
> cs8900 driver code should be implemented.
>
Yes. this idea has been offered by others also, in the past.

What if we split the cs8900if and cs8900 functions into
cs8900if.c/h and cs8900.c/h first?

Maybe cs8900if can be generalized as a ethernet media layer for
lwIP, whereas cs8900 can be made (more) processor independent.


Regards,

Leon
 
> Paul Clarke
> 
> Leon Woestenberg wrote:
> 
> >Hello Paul,
> >
> >thank you very much for this report.
> >
> >  
> >
> >>buffer. This results in  poor performance as there is less memory for
> >>incoming packets and thus lost packets.
> >>
> >>(Does this sound familar to anyone?)
> >>
> >>    
> >>
> >Our performance is poor, but that can be accounted to the microprocessor
> >being used, non-preemptive round-robin applications and several other
> >issues.
> >
> >  
> >
> >>The fix is described in the Crystal application notes 
> >>
> >>    
> >>
> >Do you know which AN?
> > 
> >  
> >
> >>    <<< SET THE TRANSMIT BUFFER SIZE TO ZERO TO DEALLOCATE  MEMORY
> >>  TXLENGTH = 0;
> >>    <<<  USE THE FORCE TRANSMIT COMMAND TO FREE THE MEMORY
> >>  TXCMD = 0x01C9U;
> >>
> >>    
> >>
> >Do other drivers (NetBSD, Linux) implement this as well?
> >
> >Regards,
> >
> >Leon.
> >
> >  
> >
> 
> 
> 
> 
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