Hello,
I am currently straightening out lib-mips/time.c to make its
granularity defined by CFG_HZ (=1000) instead of the processor’s
frequency at which MIPS counters normally run.
Can somebody explain me what the difference between
get_timer and get_ticks is? Get_timer returns the current value of the timer in
1/CFG_HZ units, as I would expect. I would expect get_ticks to return the raw counter
value, but that value would useless because there’s no way to tell what
speed it’s running at: get_tbclk is returning CFG_HZ and not the actual
counter incremental frequency. In common/main.c get_ticks is used in conjuction
with get_tbclk as if it were get_timer. This indicates either get_tbclk should
be returning the actual counter incremental frequency, or get_ticks to return
the same value as get_timer(0).
I have looked at the PPC implementation, but that wasn’t
of much help because there a hardware time base is used so that solution always
correct.
Thanks in advance!
With kind regards,
Robert.