Openmoko Bug #1194: Touchscreen Jitter

Openmoko Public Trac bugs at docs.openmoko.org
Sat Oct 18 13:12:30 CEST 2008


#1194: Touchscreen Jitter
---------------------------------+------------------------------------------
 Reporter:  mickey at openmoko.org  |        Owner:  openmoko-kernel
     Type:  defect               |       Status:  new            
 Priority:  high                 |    Milestone:                 
Component:  System Software      |      Version:  unspecified    
 Severity:  normal               |   Resolution:                 
 Keywords:                       |    Blockedby:                 
 Blocking:                       |  
---------------------------------+------------------------------------------

Comment(by Batchyx):

 I've implemented a simple-but-working dejittering tslib plugin that's a
 bit more aggressive. It's basically a stupid lowpass filter and then a
 filter that ignore small movements.

 But one of the problems that still remain is when the touchpad reported a
 release event followed by a press event while dragging.

 Before (with a stylus) :
 1223807388.426237:    351    344      1
 1223807388.451233:    351    344      1
 1223807388.471196:    351    345      1
 1223807388.496021:    351    345      1
 1223807388.526362:    351    345      1
 1223807388.551225:    351    345      1
 1223807388.576265:    352    345      1
 1223807388.606316:    352    345      1
 1223807388.631304:    352    345      1
 1223807388.656241:    352    344      1
 1223807388.681232:    352    345      1

 After :
 1223807524.541163:    395    346      1
 1223807524.566154:    395    346      1
 1223807524.596249:    395    346      1
 1223807524.621214:    395    346      1
 1223807524.646169:    395    346      1
 1223807524.676269:    395    346      1
 1223807524.701218:    395    346      1
 1223807524.726160:    395    346      1
 1223807524.746146:    395    346      1
 1223807524.776189:    395    346      1
 1223807524.806265:    395    346      1
 1223807524.836228:    395    346      1
 1223807524.861160:    395    346      1
 1223807524.881208:    395    346      1
 1223807524.911142:    395    346      1
 1223807524.946203:    395    346      1
 1223807524.971223:    395    346      1
 1223807524.996176:    395    346      1

 Before (with a finger) :
 1223807468.901233:    246    541      1
 1223807468.936273:    247    541      1
 1223807468.966163:    247    541      1
 1223807468.996255:    247    541      1
 1223807469.026267:    247    541      1
 1223807469.056241:    247    541      1
 1223807469.091309:    246    541      1
 1223807469.121207:    246    541      1
 1223807469.151334:    246    542      1
 1223807469.181235:    245    542      1
 1223807469.211325:    245    542      1
 1223807469.241233:    245    543      1
 1223807469.271311:    244    544      1
 1223807469.301354:    244    543      1
 1223807469.326284:    244    544      1
 1223807469.356265:    244    544      1
 1223807469.386287:    244    544      1
 1223807469.416234:    244    544      1
 1223807469.441288:    244    544      1
 1223807469.466151:    243    544      1
 1223807469.491217:    243    545      1
 1223807469.516293:    242    545      1


 After (with a finger) :
 1223807767.166412:    162    550      1
 1223807767.186402:    162    550      1
 1223807767.206402:    161    551      1
 1223807767.226347:    160    551      1
 1223807767.251349:    160    551      1
 1223807767.276379:    160    551      1
 1223807767.296340:    160    551      1
 1223807767.321160:    160    551      1
 1223807767.341332:    159    551      1
 1223807767.366164:    159    551      1
 1223807767.391349:    159    551      1
 1223807767.416355:    159    551      1
 1223807767.436323:    159    551      1
 1223807767.461164:    159    551      1
 1223807767.486411:    159    551      1
 1223807767.516417:    159    551      1
 1223807767.541325:    159    551      1

 One problem that still remain is when the touchscreen report a release
 then a press when we are dragging ...

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/1194#comment:14>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac


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