Chapter 9: Breakout Board
Troubleshooting
Psion Teklogix Omnii HDK User Manual
141
9.10
Troubleshooting
This section provides tips and suggested solutions for common problems encountered when
working with the breakout board.
Table 9.15 Power Troubleshooting
Symptom
Check
Solution
All power issues.
Is breakout board connected
to Omnii
?
Check and reseat connection at
both ends.
All power issues.
Is Omnii powered on?
Power on Omnii hand-held computer.
No VSYS power.
Is LED DS12 lit?
Install jumper across pins of J38.
No HDK_3V3 power.
Is LED DS11 lit?
Install jumper across pins of J37.
No HDK_5V0 power.
Is LED DS2 lit?
Install jumper across pins of J3.
No power from header J34
(HDK_3V3).
Are LEDs DS11 and DS12 lit?
Install jumpers across pins of J38
and J37.
No power from header J35
(EXP_3V3).
Is breakout board connected
to Omnii
?
Check and reseat connection at
both ends.
No power from header J36
(HDK_5V0).
Are LEDs DS2 and DS12 lit?
Install jumpers across pins of J38 and J3.
No power from HDK_3V3
side of scratch pad grid.
Are LEDs DS11 and DS12 lit?
Install jumpers across pins of J38
and J37.
No power from HDK_5V0
side of scratch pad grid.
Are LEDs DS2 and DS12 lit?
Install jumpers across pins of J38 and J3.
Table 9.16 GPIO Troubleshooting
Symptom
Check
Solution
Device not working.
Are GPIO data jumpers set
correctly?
Install jumpers J16-J19, J24-J27 and J41
to position 2-3, and jumpers J43-J46 to
position 1-2.
Device not working.
Is device being recognized as
GPIO by Omnii?
Program 1-wire EEPROM and configure
registry entries on Omnii to properly
identify device as GPIO. (See Chapter 8:
“EEPROM Specifications” and
Section 4.4.1: “Registry Settings for
Expansion Devices”.)
Device not working.
Are data lines on Omnii expan-
sion port set for GPIO device?
Use API commands to verify and set
data lines for GPIO function. (See
Section 4.7.4: “Omnii HDK API
Functions”.)
LEDs DS3-DS6
not illuminating.
Is HDK_5V0 power enabled
(are LEDs DS2 and DS12 lit)?
Install jumpers across pins of J38 and J3.
LED DS3
only
not illuminating.
Is jumper installed correctly on
jumper header J41?
Install jumper across pins 2-3 of J41.
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