Hi,
I am in the process of developing a device driver for the purpose of
stepper motor control. The timing of each pulse is determined by
external timing hardware on an I/O board, which will fire an interrupt
after the time requested. Using this method, I am able to generate
streams of pulses at
:Hi,
:
:I am in the process of developing a device driver for the purpose of
:stepper motor control. The timing of each pulse is determined by
:external timing hardware on an I/O board, which will fire an interrupt
:after the time requested. Using this method, I am able to generate
:streams of
I've done some work on measuring things like interrupt response times
and the interval between two interesting events or steps in processing.
A cheap way to do this is to use the TSC register in the CPU, though you
then need to calibrate the frequency that the CPU really runs at.
If you're
:Hi,
:
:I am in the process of developing a device driver for the purpose of
:stepper motor control. The timing of each pulse is determined by
:external timing hardware on an I/O board, which will fire an interrupt
:after the time requested. Using this method, I am able to generate
:streams of
If you only want to timestamp events and not generate the event, you
can use microtime() or nanotime(). On a 400MHz PII non-SMP you should
get 2.5 ns resolution with nanotime(). On a normal kernel with
kern.timecounter.method at the default of 0, the get... versions
give you time at the last tick
I've done some work on measuring things like interrupt response times
and the interval between two interesting events or steps in processing.
A cheap way to do this is to use the TSC register in the CPU, though you
then need to calibrate the frequency that the CPU really runs at.
If you're
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