Openmoko Bug #2019: Headphone Jack Event

Openmoko Public Trac bugs at
Sun Sep 21 20:40:33 CEST 2008

#2019: Headphone Jack Event
    Reporter:  Zoup     |        Owner:  openmoko-devel
        Type:  defect   |       Status:  new           
    Priority:  normal   |    Milestone:                
   Component:  unknown  |      Version:  Om2008.8      
    Severity:  normal   |   Resolution:                
    Keywords:           |    Blockedby:                
Reproducible:  always   |     Blocking:                

Comment(by andy):

 If I look at a working one, measuring the corner pin on Werner's pic
 (where he has the red probe) compared to 0V from the can shield, I see 0V
 at the corner pin when the jack is absent, and ~3V at the corner pin when
 the jack is in.  Maybe you can triple check.

 It's hard to imagine that it is actually the other way around on any
 single GTA02.

 Some hard imagining is still needed anyway because the 3V / 0V transition
 either way should create the jack interrupt for you.  So either the signal
 does not make it to the CPU GPIO ball, or the GPIO is blown up by ESD, or
 there is some queer software bug.  Since we stuck a 10K in series to the
 GPIO I wouldn't've expected blown up GPIO.

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