HP Forum Archive 21

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[wp34s] Minor Issue with Stopwatch on real hardware Message #1 Posted by RalfGeiger on 16 Apr 2013, 2:58 p.m. Hi all, it seems to me, that if you press R/S to start and stop the Stopwatch, the real calculator reacts about 100-200msec delayed. The iOS or the QT Version do not show a markable delay. I think that has something to do with key debouncing, but I am still in an early stage of source code "reading" ;-) Regards Ralf

Re: [wp34s] Minor Issue with Stopwatch on real hardware Message #2 Posted by pascal_meheut on 16 Apr 2013, 3:56 p.m., in response to message #1 by RalfGeiger Quote: it seems to me, that if you press R/S to start and stop the Stopwatch, the real calculator reacts about 100-200msec delayed. The iOS or the QT Version do not show a markable delay. I think that has something to do with key debouncing, but I am still in an early stage of source code "reading" ;-) Did you try comparing with a real stopwatch? I just did and it gave the same result as the WP34s to the tenth of second. But the display may not give the impression of an immediate start on the real hardware though.

Re: [wp34s] Minor Issue with Stopwatch on real hardware Message #3 Posted by RalfGeiger on 16 Apr 2013, 4:10 p.m., in response to message #2 by pascal_meheut Pascal, you're right! Sometimes what you feel is not what you get :-) I is just the display, that is delayed, but the measured value is correct. I did the test with starting and stopping the "realbuild" at the same time as the wife's iOS version and secondly comparing it to the stopwatch of the son's Gshock ... Thank you very much for that hint. Cheers Ralf Edited: 16 Apr 2013, 4:11 p.m.

Re: [wp34s] Minor Issue with Stopwatch on real hardware Message #4 Posted by Eric Smith on 16 Apr 2013, 4:12 p.m., in response to message #1 by RalfGeiger I haven't looked at the 34s code. The stopwatch code in the 41 Time Module and 41CX was carefully written to take keyboard scan and debounce time into account.

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