[En-Nut-Discussion] Ethernut Microchip PIC port

[Ake Hedman]

Henrik

The stack can be larger on 18F PICS. I have a 512 byte deep stack in my 
current project. But never mind. I found the uIP 
(http://www.sics.se/~adam/uip/) and that will be perfect for my/our needs.

Regards
/Ake


Henrik Maier wrote:

> Ake Hedman wrote:
>
>> is there a port (or something on the way) of EtherNut to the 
>> Microchip PIC platform.
>
>
> From my point of view the PIC18 architecture is too limited to be used 
> for an advanced OS as Nut/OS is. The PIC18 supports only up to 4 KB of 
> RAM and this RAM can't even be used continuously, it has to be used in 
> banks of a maximum of 256 bytes (16 banks max.), at least when you 
> allocate statically. The other limitation is the program counter 
> stack. PC stack cannot be allocated in RAM but must be in a special 
> stack space of only 32 stack locations. Nut/OS is using dynamic memory 
> to allocate stack space for the threads it's running and is using 
> stack plentifully and deep. With interrupts and context switching I am 
> sure a 32 location deep stack will overrun quickly.
>
> Cheers,
>
> Henrik
>


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Ake Hedman (YAP - Yet Another Programmer)
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