[time-nuts] GPS clock to RT-Linux for pulsar machine
Matt Ettus
boyscout at gmail.com
Fri Jul 1 21:06:05 UTC 2005
> Don't do it that way, you will get in trouble with the interrupt
> latency.
I have to echo this advice. While RTLinux and other RTOS'es have
great interrupt latency performance, using those interrupts to trigger
sampling on an ADC is a bad idea. It won't work at all if you are
trying to sample faster than about 1-10 kHz, and the jitter is
horrible even below that. Even a great RTOS will only get you about
10us repeatability. It is always best to use a real oscillator to
trigger sampling. For some reason, interrupt-based sampling seems
very popular in the radio astronomy world.
Matt
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