usb驱动程序源代码

-usb驱动程序源代码:define USB_RT_DEVICE_TO_HOST                   0x80
#define USB_RT_TYPE_MASK                        0x60
#define USB_RT_TYPE_STANDARD                    0x00
#define USB_RT_TYPE_CLASS                       0x20
#define USB_RT_TYPE_VENDOR                      0x40
#define USB_RT_RECIPIENT_MASK                   0x1F
#define USB_RT_RECIPIENT_DEVICE                 0x00
#define USB_RT_RECIPIENT_INTERFACE              0x01
#define USB_RT_RECIPIENT_ENDPOINT               0x02

//
// Definitions of the bit fields in the wIndex field of setup packets where the
// wIndex field is used to specify a endpoint (i.e. Clear_Feature, Get_Status,
// and Set_Feature).
//
#define USB_ENDPOINT_DIRECTION_MASK             0x0080
#define USB_ENDPOINT_ADDRESS_MASK               0x000F

//
// Definitions of the features that can be specified in the wValue field of a
// Clear_Feature or Set_Feature setup packet.
//
#define USB_FEATURE_ENDPOINT_STALL              0x0000
#define USB_FEATURE_REMOTE_WAKEUP               0x0001
#define USB_FEATURE_POWER_D0                    0x0002
#define USB_FEATURE_POWER_D1                    0x0003
#define USB_FEATURE_POWER_D2                    0x0004
#define USB_FEATURE_POWER_D3                    0x0005

//
// Definitions of the wValue field for a Get_Descriptor setup packet.
//
#define USB_DESCRIPTOR_TYPE_MASK                0xFF00
#define USB_DESCRIPTOR_DEVICE                   0x0100
#define USB_DESCRIPTOR_CONFIGURATION            0x0200
#define USB_DESCRIPTOR_STRING                   0x0300
#define USB_DESCRIPTOR_INTERFACE                0x0400
#define USB_DESCRIPTOR_ENDPOINT                 0x0500
#define USB_DESCRIPTOR_INDEX_MASK               0x00FF

//