[En-Nut-Discussion] NutGetMillis is a _very expensive_ function on Ethernut3

[Ole Reinhardt]

Hello,

I found that even several functions of NutOS itselt request the current
CPU clock always from the clock generator over I2C. For example every
ARP requests does so.

At least it should be possible to store the last system clock value
written to the cy22393 so that we don't need to request it every time
again. It should not change by itself, right?

Regards,

Ole Reinhardt

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