 | | Re: Interesting BrickOS Timing Results
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This was a terrific analysis. It's not surprizing that current implementation hogs so much CPU time. If all four A/D channels are scanned every 150 us then the A/D interrupt is occuring every 37.5 us since each A/D channel generates its own (...) (21 years ago, 14-Jan-03, to lugnet.robotics.rcx.legos)
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| | Re: Interesting BrickOS Timing Results
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(...) The delay was added a long time ago after a bit of discussion on this newsgroup/list. A search through old newsgroup posts will turn up a brief series of three posts with subject "Rom sensor read routine" from Apr/May 1999. The explanation (...) (21 years ago, 15-Jan-03, to lugnet.robotics.rcx.legos)
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| | Re: Interesting BrickOS Timing Results
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(...) I've found that any interrupt on the RCX has a minimum overhead of 101 to 113 states (or about 7 us). This is the time taken by the CPU to recognize and dispatch the interrupt plus the time the ROM routine takes to dispatch the interrupt to (...) (21 years ago, 15-Jan-03, to lugnet.robotics.rcx.legos)
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| | Re: Interesting BrickOS Timing Results
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From the second scope screen capture here : (URL) you can see that the analog settling time is about 10 microseconds for the rotation sensor. Philo www.philohome.com (...) (21 years ago, 15-Jan-03, to lugnet.robotics.rcx.legos)
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