Hi all,
It is also my experience that the GPIO pins of the Raspberry Pi are
very simple to access.
It is quite popular [1][2] to connect HD44780 compatible LCDs via
these GPIOs and access them via LCDproc [3]. The drawback (in my
opinion) of LCDproc is that the configuration is not very
user-friendly compared with LCD4Linux.
In the last hours I did some investigation about options to emulate
the parallel port via the GPIO pins of the Raspberry Pi. But up to now
I found no existing and promising solution.
Another option is to implement a LCD4Linux GPIO driver for the
Raspberry, but I think my skills in C are not good enough.
A the moment I think I will code a tiny script like this one [4] to
get the output I want.
Best Regards
Christian
[1] http://www.boeeerb.co.uk/pi-lcd/
[2] https://learn.adafruit.com/drive-a-16x2-lcd-directly-with-a-raspberry-pi/
[3] http://lcdproc.sourceforge.net/docs/current-user.html#hd44780-raspberrypi
[4] https://learn.adafruit.com/drive-a-16x2-lcd-directly-with-a-raspberry-pi/python-code
Post by Johan SwenkerHi,
I would like to disagree. Even though lcd4linux is older then the raspberry,
the GPIO-pins of the raspberry are
as versatile as the parallel port of yesteryear.
Using a search engine you will find several people who have connected an LCD
https://learn.adafruit.com/downloads/pdf/drive-a-16x2-lcd-directly-with-a-raspberry-pi.pdf
They even have software, though incompatibel with lcd4linux.
The same search engine will also be able to find you several LCDs with an
I2C interface (implemented by
http://www.bitwizard.nl/wiki/index.php/SPI_LCD
Regards Johan
Post by Michael ReineltHello Christian,
as lcd4linux is a lot older than raspberry, I don't think that it will
work, at least not out-of-the-box.
back in the "good old days" the only GPIO-like thing on a PC used to be
the parallel port, and thats what a low-level
driver exists for (drv_generic_parport), which uses either extremely old
school io instructions, or ppdev.
As I have absolutely no idea how GPIOs are controlled on a raspberyy, I
cannot advice you how to implement it.
maybe using some kind of i2c-to-parallel chip could work, too.
regards, Michael
Post by Prof. Dr. Christian BaunHi all,
is it possible to use LCD4Linux with a LCD (HD44780 compatible
controller), which is attached to the GPIO pins of a Raspberry Pi?
Has anybody here an example for a lcd4linux.conf file, which makes use
of the Raspberry Pi GPIO pins?
Best Regards
Christian
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