Re: Problem with three keys pressed
see http://wiki.maemo.org/N900_Hardware_Subsystems#Keyboard where I elaborated about the problem, though only regarding qualifier keys (Fn, Shift, Ctrl) /j ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
Re: Problem with three keys pressed
The only workaround is to suppress the 3'rd key (which will appear as two new keys) if the pressed keys form a rectangle in the keyboard matrix. I tried but it's really not easy (maybe impossible). If the three keys are pressed simultaneously the order of the key press event is random. Also in the case of a+x+up arrow I get a sequence of: Key: 111 Pressed time 1175712370 Key: 33 Pressed time 1175712398 Key: 38 Pressed time 1175712398 Key: 53 Pressed time 1175712398 But if I press a+x+p (which is the ghost key I get using the previous sequence) I get: Key: 38 Pressed time 1175773269 Key: 53 Pressed time 1175773269 Key: 33 Pressed time 1175773284 Key: 111 Pressed time 1175773284 The key with code 33 (the p) is always fired before the 111 (up arrow) so there's no way I can say if the user really pressed the p or the up arrow. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
Re: Problem with three keys pressed
On Sat, 5 May 2012, Paolo Iommarini wrote: I have a problem when three keys are pressed (I have the english keyboard). There are some keys combination that generates an additional key press. This seems a system bug. It can be reproduced in any textbox (like the contact search). If you press a+x+up arrow you'll see a p. I noticed it while using the Game Gripper with the psx emulator: pressing down+left+circle will end in a down+left+triangle+circle combination. I debugged the key-press-event and it is really getting a press event for the key p (code 33). There are also other strange keys combination like a+x+return = , a+x+. = o. Can someone please test it and say if it's really a system bug? This is a hardware issue. And there are more combinations revealing this issue. See for example here: http://talk.maemo.org/archive/index.php/t-40806.html I believe it is possible to recognize the fake key press/release events by analyzing the timing of those events, thus discarding these events and working around the hardware problem. But to my knowledge, noone has done it yet, and I do not expect anyone to actually do it. -- Matan Ziv-Av. ma...@svgalib.org ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
Re: Problem with three keys pressed
I thought it might be an hardware issue... Too bad, I'll try to find a workaround. Many thanks On Sat, 5 May 2012, Paolo Iommarini wrote: I have a problem when three keys are pressed (I have the english keyboard). There are some keys combination that generates an additional key press. This seems a system bug. It can be reproduced in any textbox (like the contact search). If you press a+x+up arrow you'll see a p. I noticed it while using the Game Gripper with the psx emulator: pressing down+left+circle will end in a down+left+triangle+circle combination. I debugged the key-press-event and it is really getting a press event for the key p (code 33). There are also other strange keys combination like a+x+return = , a+x+. = o. Can someone please test it and say if it's really a system bug? This is a hardware issue. And there are more combinations revealing this issue. See for example here: http://talk.maemo.org/archive/index.php/t-40806.html I believe it is possible to recognize the fake key press/release events by analyzing the timing of those events, thus discarding these events and working around the hardware problem. But to my knowledge, noone has done it yet, and I do not expect anyone to actually do it. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
RE: Problem with three keys pressed
On Saturday, May 05, 2012, Paolo wrote: I thought it might be an hardware issue... That is a phenomon called ghost-key. This is something inherent in matrix-keyboards. http://www.dribin.org/dave/keyboard/one_html/ Too bad, I'll try to find a workaround. The only workaround is to suppress the 3'rd key (which will appear as two new keys) if the pressed keys form a rectangle in the keyboard matrix. From: maemo-developers-boun...@maemo.org [maemo-developers-boun...@maemo.org] on behalf of ext Paolo Iommarini [sakya...@yahoo.it] Sent: Saturday, May 05, 2012 9:08 PM To: maemo-developers Subject: Re: Problem with three keys pressed I thought it might be an hardware issue... Too bad, I'll try to find a workaround. Many thanks On Sat, 5 May 2012, Paolo Iommarini wrote: I have a problem when three keys are pressed (I have the english keyboard). There are some keys combination that generates an additional key press. This seems a system bug. It can be reproduced in any textbox (like the contact search). If you press a+x+up arrow you'll see a p. I noticed it while using the Game Gripper with the psx emulator: pressing down+left+circle will end in a down+left+triangle+circle combination. I debugged the key-press-event and it is really getting a press event for the key p (code 33). There are also other strange keys combination like a+x+return = , a+x+. = o. Can someone please test it and say if it's really a system bug? This is a hardware issue. And there are more combinations revealing this issue. See for example here: http://talk.maemo.org/archive/index.php/t-40806.html I believe it is possible to recognize the fake key press/release events by analyzing the timing of those events, thus discarding these events and working around the hardware problem. But to my knowledge, noone has done it yet, and I do not expect anyone to actually do it. ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers ___ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
