Thank you for the prompt reply!
Output of the lsusb is attached to this mail.
Best regards,
Alexey Kosilin
On Sun, Jun 26, 2011 at 3:43 PM, Xiaofan Chen <[email protected]> wrote:
> On Sun, Jun 26, 2011 at 7:32 PM, Алексей Косилин <[email protected]>
> wrote:
> > Hi!
> >
> > As i have discovered, in some cases (at least in my hw config) the
> function
> > reports zero max packet size. I'm not sure what exactly happens (i'm not
> a
> > expert in libusb and low-level USB programming), but i definitely see,
> that
> > field wMaxPacketSize of the first device endpoint is "0" while second
> > endpoint has normal packet size - 64.
> >
> > So, i suggest to cycle through all endpoints of the given device config /
> > interface / altsetting to find first non-zero max packet size instead of
> > just using wMaxPacketSize of the first endpoint.
> > Patch file with the changes i've attached to this mail.
> > lsusb output:
> > Bus 003 Device 005: ID 0403:6001 Future Technology Devices International,
> > Ltd FT232 USB-Serial (UART) IC
> >
>
> What does "lsusb -vvv" say about the device? You can post the
> output of "lsusb -vvv -d 0403:6001" of your device.
>
> --
> Xiaofan
>
> --
> libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
> To unsubscribe send a mail to [email protected]
>
>
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Bus 003 Device 005: ID 0403:6001 Future Technology Devices International, Ltd
FT232 USB-Serial (UART) IC
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
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 6.00
iManufacturer 1 FTDI
iProduct 2 FT232R USB UART
iSerial 3 NOTASERIAL
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
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 FT232R USB UART
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0000 1x 0 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
Device Status: 0x0000
(Bus Powered)
