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The NDIS implementation in Windows CE 3.0 features IrDA support. Unlike Windows NT, which supports binding to multiple adapter instances, the Windows CE IRDA protocol driver can bind only to a single miniport driver at a time. In the Windows communications architecture, infrared sockets are exposed through extensions to the Winsock interface.
Windows CE features the following two Windows CE-specific object identifiers that provide for the sharing of hardware resources:
- OID_IRDA_REACQUIRE_HW_RESOURCES
- OID_IRDA_RELEASE_HW_RESOURCES
When an infrared socket has been opened and no others are currently open, the set information handler of the miniport is passed a request with the OID OID_IRDA_REACQUIRE_HW_RESOURCES message to the miniport. This message tells the miniport to take ownership of any resources that are needed for IR communication (for example, IrSIR opens a COM port). After all of the open infrared sockets have been closed, the miniport receives the OID_IRDA_RELEASE_HW_RESOURCES message through its query information handler. After it receives this message, the miniport releases all of the previously acquired hardware resources.
Last updated on Tuesday, July 13, 2004