Bug#704242: Driver for PL-2303 HX not working
On Wed, Apr 17, 2013 at 07:43:11PM +0200, Karsten Malcher wrote:
> Am 17.04.2013 15:13, schrieb Johan Hovold:
> > Can you minimise your test setup using a custom program which only opens
> > the device, initialises it, writes the four characters (e.g. "test")
> > and reads them back (over you hardwired loop) before closing the device
> > again?
>
> I have used a little perl program that opens the port and send "Test"
> to the looped back device.
> The length of the log looks good.
Great. Now I can see what's going on. The only problem (?) is that
everything seems to be working. The write succeeds and the four bytes
are read back as they should by the driver.
The first thing that comes to mind that could prevent you from reading
the received data would be if the tty device is configured for canonical
input processing. Have you made sure this is not the case? Can you read
the data back if you add a newline to your test string (e.g. "test\n")?
> > Make sure to verify it using a working device first.
>
> I use this script with a ch341 adapter and it works.
Hmmm. Did you remember to initialise the device (e.g. set the termios
flags)?
Johan
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