usb/158650: uplcom USB To COM Device doesn't transmit data, only receive

[Hans Petter Selasky]

On Tuesday 05 July 2011 02:37:49 Renato Tambellini wrote:
> >Number:         158650
> >Category:       usb
> >Synopsis:       uplcom USB To COM Device doesn't transmit data, only
> >receive Confidential:   no
> >Severity:       non-critical
> >Priority:       low
> >Responsible:    freebsd-usb
> >State:          open
> >Quarter:
> >Keywords:
> >Date-Required:
> >Class:          sw-bug
> >Submitter-Id:   current-users
> >Arrival-Date:   Tue Jul 05 00:40:09 UTC 2011
> >Closed-Date:
> >Last-Modified:
> >Originator:     Renato Tambellini
> >Release:        8.2-STABLE
> >Organization:
> 
> >Environment:
> FreeBSD devilbox.homeunix.net 8.2-STABLE FreeBSD 8.2-STABLE #0: Wed Jun  1
> 05:48:46 BRT 2011    
> root at devilbox.homeunix.net:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> >Description:
> The USB To COM Device Prolific PL-2303 doesn't transmit data, only receive.
> 
> # dmesg | grep Prolific
> ugen1.4: <Prolific Technology Inc.> at usbus1
> uplcom0: <Prolific Technology Inc. USB 2.0 To COM Device, class 0/0,
> rev 1.10/3.00, addr 4> on usbus1
> 
> # usbconfig -d 1.4 dump_device_desc
> ugen1.4: <USB 2.0 To COM Device Prolific Technology Inc.> at usbus1,
> cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
> 
>  bLength = 0x0012
>  bDescriptorType = 0x0001
>  bcdUSB = 0x0110
>  bDeviceClass = 0x0000
>  bDeviceSubClass = 0x0000
>  bDeviceProtocol = 0x0000
>  bMaxPacketSize0 = 0x0040
>  idVendor = 0x067b
>  idProduct = 0x2303
>  bcdDevice = 0x0300
>  iManufacturer = 0x0001  <Prolific Technology Inc.>
>  iProduct = 0x0002  <USB 2.0 To COM Device>
>  iSerialNumber = 0x0000  <no string>
>  bNumConfigurations = 0x0001
> 
> >How-To-Repeat:
> 1) Plug the DB9 to serial console on another box using a null-modem cable.
> 2) Plug the device to USB port.
> 3) Try to access the console:
> 
> cu -l /dev/cuaU0 -s 9600
> 
> 4) The terminal only receive data, not transmit.
> 

Hi,

Can you run usbdump and show what happens when you try to transmit data?

Are you sure the baudrate is correct?

usbdump -i usbus1 -vvvv -s 4096

ugen1.4 -> usbus1
ugen2.4 -> usbus2
...

--HPS