2011/3/11 Nathan Kelhos <nathankel...@gmail.com>:
> Try "lsusb -vv" and cut off everything that is not related to your device. I
> would like to give a look on your descriptor hierarchy.
>
> Heres the verbose descriptor information for my device:
>
> [nckelley@hawc02 pci0000:00]$ lsusb -vv -d 0403:6001
> Bus 004 Device 007: ID 0403:6001 Future Technology Devices International,
> Ltd FT232 USB-Serial (UART) IC
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 1.10
> bDeviceClass 0 (Defined at Interface level)
> bDeviceSubClass 0
> bDeviceProtocol 0
> bMaxPacketSize0 8
> idVendor 0x0403 Future Technology Devices International, Ltd
> idProduct 0x6001 FT232 USB-Serial (UART) IC
> bcdDevice 4.00
> iManufacturer 1
> iProduct 2
> iSerial 0
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 32
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0xc0
> Self Powered
> MaxPower 90mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 2
> bInterfaceClass 255 Vendor Specific Class
> bInterfaceSubClass 255 Vendor Specific Subclass
> bInterfaceProtocol 255 Vendor Specific Protocol
> iInterface 2
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x81 EP 1 IN
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0040 1x 64 bytes
> bInterval 0
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x02 EP 2 OUT
> bmAttributes 2
> Transfer Type Bulk
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0040 1x 64 bytes
> bInterval 0
> cannot read device status, Operation not permitted (1)
>
> I see two endpoint addresses in there, 0x81 and 0x02, one of those?. Is
> there a function(s) in pyusb to use this (seemingly only) interface and one
> of those endpoints?
>
> And, this is all device-specific, and not OS-dependent, right? My goal is
> to use pyusb on a mac...(it worries me slightly to have to use a linux
> machine/commands to hunt down all this info).
>
> --
> Nathan
>
Your are trying to write to a non-existent endpoint address 1, where
you probably mean 2...
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