[PLUG] USB-to-Serial Converter?

Rich Shepard rshepard at appl-ecosys.com
Fri Jun 29 21:40:50 UTC 2007


On Fri, 29 Jun 2007, Eric Wilhelm wrote:

> Further, I'm not sure that such a device would solve the problem of "palm
> shows up as two serial ports that move around".  At best, it would be a
> single serial port supporting one usb-serial endpoint.  It seems that
> anything more complicated would manifest as a more active device with a
> custom driver, which, for best results would need to hook into the usb
> driver layer, right?

Eric et al.,

   I've learned a lot about USB the past couple of days. First, it's no big
deal that two ports show up; the PDA uses the odd-number port although
jpilot will apparently also use the even-number port in the near future. The
jumping around, I've discovered, relates to timing: when sync buttons are
clicked on the PDA and on the monitor. This morning's testing kept the
connection consistently on USB1. Didn't always connect then, but I've got
part of the timing down.

   Second, instead of Greg K-H's 'visor' kernel module that needs to be tuned
to each device used and loaded into the kernel, there is now libusb that is
more generic, tuned to modern devices, and 200%-600% faster. I have it
installed, it's used with pilot-link-0.12.0 and up, and I'll be testing it
later this afternoon. It should solve the connection problems, but I'll
still need to learn the timing rythym for it.

   Will report back on libusb when I have something to write.

Rich

-- 
Richard B. Shepard, Ph.D.               |    The Environmental Permitting
Applied Ecosystem Services, Inc.        |          Accelerator(TM)
<http://www.appl-ecosys.com>     Voice: 503-667-4517      Fax: 503-667-8863



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