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Issuing Hardware-Dependent Commands through HCI (Windows Embedded CE 6.0)

1/6/2010

The HCI can be used to issue a hardware-dependent command by using the PacketMarker structure.

This structure is used do a select command if it is differentiated by some of its parameters. For example, if there are five outstanding HCI_CreateConnection commands to different Bluetooth devices, then for each command, PacketMarker contains a BTH_MARKER_ADDRESS and the address of the target device.

PacketMarker is used in conjunction with the HCI_CustomCode_In interface to match its asynchronous event with the command itself. Use HCI_CustomCode_In with caution, because issuing commands through a command-specific interface can have a side effect not created by a HCI_CustomCode_In command.

The following code example shows PacketMarker definition and the function pointer declaration for HCI_CustomCode_In.

#define BTH_MARKER_NONE            0
#define BTH_MARKER_CONNECTION      1
#define BTH_MARKER_ADDRESS         2

typedef struct _packet_marker {
   unsigned int      fMarker;
   union {
      BD_ADDR         ba;
      unsigned short   connection_handle;
   };
} PacketMarker;

typedef int (*HCI_CustomCode_In) (
  HANDLE           hDeviceContext,
  void            *pCallContext,
  unsigned short   usOpCode,
  unsigned short   cPacketSize,
  unsigned char   *pPacket,
  PacketMarker    *pMarker,
  unsigned char    cEvent
);

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