Re: [lcd4linux] serial HD44780

[Ognjen B. <og...@ma...>]

But will serial connections be supported in future?

What exactly is I2C, I know it is a serial bus, but where is it? Is
there a I2C connector on my motherboard? or does it work using the
serial/parallel ports. Where can I find more information regarding how
to connect LCD displays
to the I2C bus.

Thanks

paul kamphuis wrote:

> 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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>
>