Openmoko Bug #2229: GSM was working fine for months, suddenly will not register using any GSM stack
Openmoko Public Trac
bugs at docs.openmoko.org
Thu May 7 16:20:32 CEST 2009
#2229: GSM was working fine for months, suddenly will not register using any GSM
stack
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Reporter: danek2 | Owner: joerg
Type: defect | Status: accepted
Priority: normal | Milestone:
Component: hardware | Version: GTA02v5
Severity: normal | Keywords: calypso, gsm, registration
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: always
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Comment(by slm3095om):
Replying to [comment:8 joerg]:
> Replying to [comment:6 slm3095om]:
> > In the absence of a scope, I ran the following shell script while I
reran my test
>
> Alas the voltages data from battery coulomb counter are very slow. You'd
need a real scope to do this test.
How long does the voltage drop have to last to affect the modem? I could
throw together a "poor man's oscilloscope" using an Arduino board. I can
sample one of the 10bit ADCs about 500 times per second; that should allow
me to detect the voltage drop if it last for 4 or 5 milliseconds. Not a
10MHz scope by a long shot, but is it close enough?
> Could you all please state which hw version (board revision, and
datecode) you got.
from /proc/cpuinfo:
Hardware : GTA02
Revision : 0350
the date code is 20080620
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Ticket URL: <https://docs.openmoko.org/trac/ticket/2229#comment:10>
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