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[Lcdproc] lcdproc v0.5.3 - ConnectionType=ftdi [[ Segmentation fault ]]

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  • From: bsdfan at (Markus Dolze)
  • Subject: [Lcdproc] lcdproc v0.5.3 - ConnectionType=ftdi [[ Segmentation fault ]]
  • Date: Sun, 24 Oct 2010 13:57:31 +0200


the 'wiring' I talked about earlier refers to the way of connecting a hd44780
display directly to the output lines of a FT2232/245 (which has a parallel
FIFO output).

Displays like Mplay (or Crystalfontz or MatrixOrbital) usually have the
display connected to a microcontroller instead which takes care of displaying
the data. That MC has to be connected to the computer somehow. One common way
is to use a FT232 to connect the MC to the PC using USB. On the PC side the
display appears as a serial port to which an application (like LCDd) can
send/read data.

If your display appears like a serial port to the OS and the Mplay sub-driver
does not work, there may be an issue with the driver itself or you have a
type of display which the sub-driver does not know how to talk to.

I will have a look at the Mplay driver, but I will be away for a few days.


-------- Original-Nachricht --------
> Datum: Sun, 24 Oct 2010 02:28:37 +0100
> Von: Santanu Das <santanu at>
> An: lcdproc at
> Betreff: Re: [Lcdproc] lcdproc v0.5.3 - ConnectionType=ftdi [[
> Segmentation fault ]]

> Hi Markus,
> > Hello Santanu,
> >
> > please note that the hd44780 FTDI connection type is for use with FT2232
> or FT245 FIFO chips and requires special wiring.
> From the various source of reading, it does look like the display/IR is
> based on FTDI FT232R USB to serial chip. What kind of "special wiring"
> you are talking about? Although I connect the display directly to a
> internal USB header; is it possible that the "wiring" is done internally?
> Cheers,
> Santanu
> > Unless you know that your MPlay device makes use of these, the hd44780
> ftdi connection is probably not what you are looking for.
> >
> > You may try hd44780's 'mplay' connection type instead.
> >
> > See
> for more information.
> >
> > Regards
> > Markus
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> LCDproc at

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