[En-Nut-Discussion] Correction to previous post and more info

[Ralph Mason]

Another cause may be lack of stack space. It may work
> hundreds of times and suddenly fail, because an interrupt
> routine uses 20 Bytes of stack, when nothing is available.
> This problem is discussed in
> http://www.ethernut.de/pdf/enmem100.pdf

I think an interrupt stack would be a very good idea in general. Means that
stack usage is more deterministic.  It also means every thread doesn't need
enough space for it's self and the largest interrupt handler.

Ralph