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Chapter 19: Wireless Wide-Area Networking
Initializing WWAN
Psion Mobile Devices Developers Guide
200
Windows Mobile 2003 Second Edition
Windows Mobile Classic 6.x
It is intended that it will work with future expansion board radios.
Modems that are not controlled by the GSM power driver
The power status on the following types of modems are not controlled by the GSM driver. Refer to
Chapter 9: “Card Slots” for details:
•Modems on PC cards
Modems on CF cards
Modems on devices using the following operating systems are not controlled by the GSM power driver:
Windows Mobile Professional 6.x
Windows Embedded Hand-Held 6.5
19.5 Initializing WWAN
Before any of the WWAN functions can be used, you must initialize the WWAN interface.
19.5.1 Checking the Initialization Status of the WWAN Driver
Use GetReadyState to check the initialization status of the driver. This returns one of the following:
C++: A WWAN_READY_STATE structure containing the WWAN driver status flags.
.NET: A member of the WWAN_READY_STATE_FLAGS enumeration.
19.5.2 WWAN Driver Status Flags
The WWAN status flags indicate the status of the WWAN driver. This WWAN driver status depends on the
status of the modem.
Many WWAN API functions depend on the modem being in the ready state. If the modem is not ready, they
report an error.
There are two methods for finding the modem status. The first is to use API elements that query the
modem status. The second is to register a callback for modem initialization.
This second method—using a callback— is recommended. Repeated queries of modem status can result in
excessive processor activity and a consequent drain on the battery power of the computer. If there is no
other activity on the hand-held computer, the processor can go into an idle state until activated by
the callback.
In both cases status bits are returned that indicate which functions are available.
The WWAN driver can be in one or more of the following states:
WWAN NDIS -WAN
Mi nip ort drive r
Seria l dri ver
WWAN modem
Mobile Devices SDK
Power API
Powe r C ontrol Pane l
user interface
GSM po wer dri ver
WWAN NDIS -WAN
Mi nip ort drive r
Seria l dri ver
WWAN modem
Appl ica ti on u sing
Power API
Powe r C ontrol Pane l
user interface
GSM po wer dri ver
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