Motorola MC68HC908JB8, Справочное руководство

Страница: 144 / 244

Designer Reference Manual USB08 Evaluation Board
144 Universal USB Device Driver (USBIO) MOTOROLA
Universal USB Device Driver (USBIO)
Handle2 and Handle3 are called pipe handles. Note that while Handle1
cannot be used to communicate with a pipe, any operation on the device
can be executed by using Handle2 or Handle3, too.
E.4.2 Establishing a Connection to the Device
The following code sample demonstrates the steps that are necessary
at the USBIO API to establish a handle for a device and a pipe. The code
is not complete, no error handling is included.
// include the interface header file of USBIO.SYS
#include “usbio_i.h”
// device instance number
#define DEVICE_NUMBER 0
// some local variables
HANDLE FileHandle;
USBIO_SET_CONFIGURATION SetConfiguration;
USBIO_BIND_PIPE BindPipe;
HDEVINFO DevInfo;
GUID g_UsbioID = USBIO_IID;
SP_DEVICE_INTERFACE_DATA DevData;
SP_INTERFACE_DEVICE_DETAIL_DATA *DevDetail = NULL;
DWORD ReqLen;
DWORD BytesReturned;
// enumerate the devices
// get a handle to the device list
DevInfo = SetupDiGetClassDevs (&g_UsbioID,
NULL,NULL,DIGCF_DEVICEINTERFACE|DIGCF_PRESENT);
// get the device with index DEVICE_NUMBER
SetupDiEnumDeviceInterfaces (DevInfo, NULL,
&g_usbioID, DEVICE_NUMBER, &DevData );
// get length of detailed information
SetupDiGetDeviceInterfaceDetail (DevInfo, &DevData, NULL,
0, &ReqLen, NULL);
// allocate a buffer
DevDetail = (SP_INTERFACE_DEVICE_DETAIL_DATA*) malloc (ReqLen);
// now get the detailed device information
DevDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
SetupDiGetDeviceInterfaceDetail (DevInfo, &DevData, DevDetail,
ReqLen, &ReqLen, NULL);
// open the device, use OVERLAPPED flag if necessary
// use DevDetail->DevicePath as device name
FileHandle = CreateFile(
DevDetail->DevicePath,
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE|FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0 /* or FILE_FLAG_OVERLAPPED */,
NULL);