Nanopore,
That error officially means:
“Attempted to read
samples that are no longer available. The requested sample was previously
available, but has since been overwritten.
Increasing the buffer
size, reading the data more frequently, or specifying a fixed number of samples
to read instead of reading all available samples might correct the problem.”
So what could be happening in your system is that you are
collect samples faster (as you increase your sample rate) then you are pulling them
out of the buffer. The “Rate” input determines your sample rate, and the “Samples
to Read” determines how many samples you wait for to be in the buffer before you
pull them out. One thing you may try is to reduce the “Samples to Read” value,
that way you pull from the buffer more often and hopefully avoid this error.
Another thing you should try is to remove the writing to
file from the while loop for now. What could be happening is the writing to
file takes too long, and that is causing the buffer to overwrite itself. So for
now just run the example program as is, with no file logging, and make sure it
can run at the speeds you need. Then if that works, you will have determined
that it’s the file IO that is bogging things down. Then you can look into more
efficient ways of writing to a file (i.e. not using the express VI inside the
while loop).
Give those things a shot, and let us know how it goes. Once
we know where the problem is, we can offer advice as to where to go from there.
Hope this has helped.
-GDE
