Re: [lcd4linux] serial HD44780

[paul k. <pau...@xs...>]

Hi Ognjen,

Serial port connection is not currently support. The only alternative 
connection method for the HD44780 display is an i2c interface. I know 
there is kernel support for i2c over parallel port, but I am not sure if 
it is available over serial port. I think it should be possible since 
you need to control only 3 wires. Nevertheless you need additional 
hardware to make it work,  a single pcf8574 is required.

kind regards,

Paul

Ognjen Bezanov wrote:

>Hi all,
>
>I want to use a HD44780 2x24 LCD display with a linux box, but without
>using up the parallel port (still use it for the
>printer). I was wondering what other methods are there of connecting the
>displays to the computer.
>
>I know of the USB method, but was wondering of there are any other
>methods. I googled about and came across
>a project knows as LCD serialiser (project page:
>http://www.mindspring.com/~tcoonan/lcd.html).
>
>This seemed to fit my needs except that:
>
>a) I do not have the required components - So does anyone know where I
>can buy pre-assembled versions of these boards? I can build it, its just
>that I would need to purchase quite a bit of kit (e.g. PIC programmer)
>in order to do it.
>
>b) There is no mention on the lcd4linux wiki about supporting this
>project in particular (although there are references to serial-based
>lcd's such as the lcd terminal emulator). Is there support for this
>project in lcd4linux and if not, is it planned at all? looking at the
>project it seems that the commands sent are the same (raw) command you
>send to a hd44780 on a parallel port, except that its sent down a serial
>link.
>
>So is their any support for this? and if not, can anyone recommend an
>alternative method of connecting lcd's to the computer.
>
>Cheers.
>
>
>
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