> but my problem is there is some time delay for
> execution of instruction , which limits the sampling
> i can only sample at a rate of 300 samples per
> that means it is taking 3 ms for execution of less
> than 10 instructions........
THe problem you are facing is that all usleep, udelay, ... functions in
userspace are using the linux scheduler, and therefore delay at least on
e timer tick (which should be about 10 msec).
> Is there any solution to this problem..... how can i
> increase my sampling rate ????
It's quite complicated to get fine-granulated delays with linux in
userland. You have to do busy-waiting.
Take a look at lcd4linux (http://lcd4linux.sourceforge.net), especially
the file udelay.c (use the CVS version, the tarballs are quite
outdated). Here I implemented a userspace timer with nanosecond
resolution, which uses either timeofday() or TSC (time stamp counter) on
If you have any questions, feel free to ask.
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