On Wednesday 06 October 2010 17:33:33 Paul Schwarz wrote: > Hi Group, > > I pose the following dilemma and look forward to enthusiastic > discussions.
could you post plain old PDFs of the schematic. those flash-pdfs are a thorough pita. > > As mentioned in a previous e-mail to you'll, we have developed an > embedded PC with a touch screen. This device runs on a RMI, Alchemy > processor (AU1250) and its touch screen is connected to this CPU > via an ADS7843 chip and through the SPI bus. So far so good and > pretty standard. The system originally ran on WinCE5.0 (Booooo!) > and we are currently porting it to Linux. > > Now the problem that we are facing is that after the first 3-4 > touch events, no more touch events are recorded after that and the > sensitivity of the clicks is very weak. The input of the A-D converter is a high impedance source. In a noisy environment, the parasitic Cs charge up. This is usually the cause of gradual loss of sensitivity. > Lastly, when the screen is > touched while a video is playing the video and audio pause for the > duration of the touch. this could definetly be the driver waiting for "release" event. -- Rgds JTD -- http://mm.glug-bom.org/mailman/listinfo/linuxers
