On Sat, Jan 10, 2009 at 1:11 PM, Pierre Willenbrock <pierre at pirsoft.dnsalias.org> wrote: > m. allan noah schrieb: >> On Fri, Jan 9, 2009 at 5:02 PM, Pierre Willenbrock >> <pierre at pirsoft.dnsalias.org> wrote: > [...] >> >>> Another question: Is it okay to only look at the hardware state if the >>> frontend asks for the state of the option? That way shorter presses can >>> be lost, if the frontend does not poll often enough. >> >> In my case, the scanners are smart enough to buffer the button presses >> for 3 seconds, and I effectively read the status of all the buttons >> from the scanner every time you ask for the value of the first option. >> So, as long as the front-end reads within that 3 second window, no >> presses are lost. >> >> If your machines dont buffer, then you might need a thread just to >> read the status really quickly? Do you know how frequently the windows >> driver reads the buttons? > > The genesys chips don't help at detecting hardware buttons. The only > sensor logic in the chip is for the home-sensor. The rest is GPIO.
Is it possible for a user to press and release the button and have the driver 'lose' it if you dont read the GPIO pins during the 'pressed' inteval? > The windows driver polls at 2Hz, this is not much better than the > polling frequency of sanebuttonsd(1Hz). I'll go for the non-threaded > variant for now, while making the logic work if the polling function is > called more often than the sane options are looked at. 1Hz from sanebuttonsd has generated some complaints about being too slow. I think we should bump it up to 2hz, so that might help. > >>> Before i start to ask more similar questions: Is this documented >>> somewhere? I looked at the html-version of the standard, but could only >>> find the capabilities thing for buttons. >> >> Nothing is documented. Everything we are discussing now came about >> from prior threads on this list, and thru several iterations of button >> support and button daemon work i did for users of the fujitsu backend. >> IOW, this might not work for your scanners, so we should modify it if >> required. > > Thanks for your answers, NP- allan -- "The truth is an offense, but not a sin"
