Hello
I'm trying to use usb parallel port cable with wiggler clone, but with
no luck. Cable shows itself in lsusb as:
Bus 007 Device 039: ID 067b:2305 Prolific Technology, Inc. PL2305 Parallel Port
and creates device node as /dev/usb/lp0
Looking at openocd code I found out that it use ppdev which is not
supported by usb cable.
Is there any way to use this cable with openocd?
Thanks,
Andrey
This kind of USB - to - PARALLEL PORT device was designed for Printer
Protocol usage.
If you want to use it as a bitbang Wiggler, it could work, but it will
be VERY VERY slow. Each parallel port access over USB will be 1 to 5ms
if your chipset is full-Speed USB2.0 . (I never saw this kind of device
with high-speed USB)
In 2004, we, at Amontec, tried to use this kind of device for our
Amontec Chameleon POD with Wiggler configuration, Raven configuration or
JTAG Accelerator core configuration. It was working but unusable
regarding final communication speed between the USB and the Amontec
Chameleon POD.
For USB, you really should select an other generic interface as the
- Amontec JTAGkey (full-speed USB 2.0 6MHz USB JTAG TCK based FTDI
FT2232) or
- Amontec JTAGkey-2 (high-speed USB 2.0 30MHz USB JTAG TCK + RTCK
support based FTDI FT2232H)
or any other specific USB Dongle supported by OpenOCD.
Regards,
Laurent
http://www.amontec.com
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