I am using the G4 Laptop to do my job, so i am sure
that the usb port is high-speed capable. And i just
found that the there are two configuration descriptor
for the device i am using. One is the default
configuration descriptor and another is called other
speed configuration descriptor. So how can i switch to
another configuration descriptor instead the default
descriptor?
This is the information of the camera i get from USB
prober:
Configuration Descriptor
Total Length of Descriptor: 39
Number of Interfaces: 1
Configuration Value: 1
Attributes: 0xC0 (self-powered)
MaxPower: 0 ma
Interface #0 - Composite
Alternate Setting 0
Number of Endpoints 3
Interface Class: 0 (Composite)
Interface Subclass: 0
Interface Protocol 0
Endpoint 0x01 - Bulk Output
Attributes: 0x01 (OUT)
Attributes: 0x02 (Bulk)
Max Packet Size: 64
Polling Interval: 0 ms
Endpoint 0x81 - Bulk Input
Attributes: 0x81 (IN)
Attributes: 0x02 (Bulk)
Max Packet Size: 64
Polling Interval: 0 ms
Endpoint 0x83 - Bulk Input
Attributes: 0x83 (IN)
Attributes: 0x02 (Bulk)
Max Packet Size: 64
Polling Interval: 0 ms
Device Qualifier Descriptor
Descriptor Version Number: 0x0200
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol 0
Device MaxPacketSize: 64
Number of Configurations: 1
bReserved: 0
Other Speed Configuration Descriptor
Total Length of Descriptor: 39
Number of Interfaces: 1
Configuration Value: 1
Attributes: 0xC0 (self-powered)
MaxPower: 0 ma
Interface #0 - Composite
Alternate Setting 0
Number of Endpoints 3
Interface Class: 0 (Composite)
Interface Subclass: 0
Interface Protocol 0
Endpoint 0x01 - Bulk Output
Attributes: 0x01 (OUT)
Attributes: 0x02 (Bulk)
Max Packet Size: 512
Polling Interval: 0 ms
Endpoint 0x81 - Bulk Input
Attributes: 0x81 (IN)
Attributes: 0x02 (Bulk)
Max Packet Size: 512
Polling Interval: 0 ms
Endpoint 0x83 - Bulk Input
Attributes: 0x83 (IN)
Attributes: 0x02 (Bulk)
Max Packet Size: 512
Polling Interval: 0 ms
Thanks!!
shejian..
--- Fernando Urbina <email@hidden> wrote:
> You just need to connect it to a machine that is
> high-speed capable.
>
> --
> Fernando Urbina
> USB Technology Team
> Apple Computer, Inc.
>
> On Apr 24, 2005, at 8:22 PM, She Jian, Chia wrote:
>
> > Thanks, now i can read more data in one packet.
> And
> > now I want to know that whether it is possible to
> set
> > the device speed as i just discovered that my
> camera
> > is connected as FullSpeed device instead of
> HighSpeed
> > device? This device is suppose to be connected as
> > HighSpeed device. Thanks!!
> >
>
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