Chapter 10: HDK Demo Application
Main Tabs
Psion Teklogix Omnii HDK User Manual
153
UART and GPIO devices share the same data pins on the expansion port, so the current function
of the pins must be defined by the application. If the GPIO tab was previously selected, the
following warning message appears when selecting the UART tab:
This informs the user that the function of the pins will be changed from GPIO to UART operation,
to conform with the tab being selected. Tap on
OK
to continue on to the UART tab, or
Close
(
X
)
to remain on the current tab and leave the pins configured for GPIO operation.
After tapping
OK
, the following warning message appears:
Since UART and GPIO devices share the same data communication pins, the breakout board must
also be configured so that the pins are routed to the proper circuits on the board. This configuration
is done by jumpers on the breakout board, and is described in Chapter 9: “Breakout Board”.
Ensure that the jumper settings are correct, and tap
OK
to proceed.
If the UART device driver is not loaded, or the COM port cannot be opened for any reason, the
following error message appears:
Tap OK to continue. The features on the UART tab will be unavailable until the issue is corrected.
Verify the registry settings for the UART device, and ensure that the subkey name of the device
matches the Manufacturer and Model fields of the 1-wire EEPROM, as described in Section 10.4:
“Creating Registry Keys”.
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