[Lcdproc] does LCDd support usb to parallel converter ?

[Eric Pooch]

Guillaume,

I believe I may have been wrong about this.  I thought that since =20
there was a linux kernel driver, there should be no problem.  =20
However, because the adapter shows up as a /dev/parport, rather than =20
a base address, LCDproc apparently can't use it.  The USS720 chips =20
themselves support all the low-level functions you would need to run =20
an LCD off of them and I regularly do it:
http://home.sandiego.edu/~epooch/cgi-bin/blosxom.cgi/tech/leds/=20
Mac_USB_LCD.html

sorry for the bad advice.
--Eric


On Aug 2, 2007, at 10:01 PM, Eric Pooch wrote:

> Guillaume,
>
> The USS720 chip is different from most of the parallel printer =20
> converters out there, which is why it is probably the only one with =20=

> a linux kernel driver.  Most adapters would just use a high level =20
> USB library.  This chip allows full access to all of the parallel =20
> registers including all of the control lines.  It should look like =20
> a built-in parallel port to your applications.
>
> --Eric
>
>
> On Aug 2, 2007, at 7:23 AM, Guillaume Membr=E9 wrote:
>
>> Thanks for your answer.
>>
>> I was worried because it seems (but I can't verify it) that the
>> application must not use any low level instructions of the parrallel
>> port in order to be able to use this kind of device.
>>
>> Guillaume
>>
>> On 8/2/07, Eric Pooch <epooch@cox.net> wrote:
>>> Because it has a kernel driver, it should act exactly like a =20
>>> built-in
>>> parallel port.  Since lcdproc works with built-in parallel ports, it
>>> will work with those adapters.  I have had good luck with these on
>>> the Mac and regularly use them to power and send data to LCDs.
>>>
>>> --Eric
>>>
>>> On Aug 2, 2007, at 5:57 AM, Guillaume Membr=E9 wrote:
>>>
>>>> Hello,
>>>>
>>>> I have HD44780-compatible LCD connected to the parallel port and =20=

>>>> wired
>>>> in 8-bit winamp.
>>>> I would like to connect it via usb. I have found that some
>>>> usb-to-parallel are supported by the kernel : those with a =20
>>>> USS720 ou
>>>> USS725 chip are recognized. [1] explains this in details.
>>>>
>>>> So here is my question : is LCDd able to drive a HD44780 trough
>>>> this converter ?
>>>>
>>>> [1] : http://www.g-cipher.net/~reboots/projects/lcd/
>>>>
>>>> Thanks a lot
>>>> Guillaume
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>>>
>>>
>