Hi
I have (I believe) a USB composite device with one interface
which is HID, see info from usb prober at the end of email.
I found on this list that
> making a device with a single interface a composite device
>is a very good idea, because it allows the
>AppleUSBComposite driver to configure it and handle things
>like hub resets gracefully.
and that all usb devices should be designed like this.
But when I run an HID program in Matlab/psychtoolbox, it
does not see my device, and when I run apple HID explorer,
it does not see it either, in both cases, it only sees the
mouse pad and keyboard.
I want to talk to this USB device.
I researched two possibilities without success:
1. HID explorer is a complete project which I can actually
compile. What function do I need to rewrite/correct it so
that the HID explorer sees my HID device.
2. Darwin has some kind of USBcomposite driver in a package
called IOUSBfamily ... Where can I find a complete example
which I can compile which shows me how to use these
functions which I can copy from darwin
And just out of curiosity, if according to the following
>It also makes it comply with the spec.
>The defined class codes
><http://www.usb.org/developers/defined_class> specify most
>class codes for interfaces only. There are very few class
>codes which are defined for the device to use.
>I'm pretty sure that the HID spec specifically stats that a
>HID device should have device class == 0, and the HID is
>specified by the interfaces.
>On a practical note, using a single interface in a
>composite device means that there is no difference in the
>handling of single and multiple interface devices, which
>means its less likely to go wrong. Single interface
>composite devices probably make up 95% of the extant USB
>devices.
a composite device with a single HID interface is the proper
way to configure an HID device, why is HID explorer failing
to see my USB device?
NB: the application which uses the device runs
USBSimpleExample to connect to my device, according to the
console log.
USBSimpleExample: Starting
Found device 0x000091ab
dealWithDevice: found 1 configurations
found interface: 0x000092db
dealWithInterface: found 2 pipes
dealWithPipes: grabbing BULK IN pipe index 1, number 1
dealWithPipes: grabbing BULK OUT pipe index 2, number 2
Somehow it uses this generic driver to connect to the USB. I
should be able to do the same, but I don't know how. I have
a PC open source code accessing this device, and the ST7
microelectronics documentation.
---------------------------------------------------------------
USB Prober output.
Device Descriptor
Descriptor Version Number: 0x0110
Device Class: 0 (Composite)
Device Subclass: 0
Device Protocol: 0
Device MaxPacketSize: 8
Device VendorID/ProductID: 0x0483/0x0035
(STMicroelectronics)
Device Version Number: 0x0111
Number of Configurations: 1
Manufacturer String: 3 "STMicroelectronics"
Product String: 1 "ST7 RS232 USB BIOFBK"
Serial Number String: 0 (none)
Configuration Descriptor
Total Length of Descriptor: 41
Number of Interfaces: 1
Configuration Value: 1
Attributes: 0x80 (bus-powered)
MaxPower: 20 ma
Interface #0 - HID
Alternate Setting 0
Number of Endpoints 2
Interface Class: 3 (HID)
Interface Subclass; 0
Interface Protocol 0
HID Descriptor
Descriptor Version Number: 0x0110
Country Code: 33
Descriptor Count: 1
Descriptor 1
Type: 0x22 (Report Descriptor)
Length (and contents): 29
Raw Descriptor (hex) 0000: 06 80
FF 09 00 A1 01 75 08 95 08 15 00 26 FF 00
Raw Descriptor (hex) 0010: 09 01
B1 82 09 01 81 82 09 02 91 82 C0
Parsed Report Descriptor:
Usage Page (65408)
Usage 0 (0x0)
Collection (Application)
Report Size.............
(8)
Report Count............
(8)
Logical Minimum.........
(0)
Logical Maximum.........
(255)
Usage 1 (0x1)
Feature.................
(Data, Variable, Absolute, No Wrap, Linear, Preferred State,
No Null Position, Volatile, Bitfield)
Usage 1 (0x1)
Input...................
(Data, Variable, Absolute, No Wrap, Linear, Preferred State,
No Null Position, Bitfield)
Usage 2 (0x2)
Output..................
(Data, Variable, Absolute, No Wrap, Linear, Preferred State,
No Null Position, Volatile, Bitfield)
End Collection
Endpoint 0x81 - Interrupt Input
Attributes: 0x81 (IN)
Attributes: 0x03 (Interrupt)
Max Packet Size: 8
Polling Interval: 10 ms
Endpoint 0x02 - Interrupt Output
Attributes: 0x02 (OUT)
Attributes: 0x03 (Interrupt)
Max Packet Size: 8
Polling Interval: 10 ms
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