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From: Prof. D. C. B. <wol...@gm...> - 2014-08-31 11:18:54
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Hi 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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From: Michael R. <mi...@re...> - 2014-08-31 11:58:53
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Hello 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 Am 2014-08-31 13:18, schrieb Prof. Dr. Christian Baun: > Hi 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 > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Lcd4linux-users mailing list > Lcd...@li... > https://lists.sourceforge.net/lists/listinfo/lcd4linux-users > > -- Michael Reinelt <mi...@re...> http://home.pages.at/reinelt GPG-Key 0xDF13BA50 ICQ #288386781 |
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From: Johan S. <joh...@xs...> - 2014-08-31 18:49:35
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Hi, 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 to the RPi. For example: 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 adding a microcontroller board to the LCD). Among them: http://www.bitwizard.nl/wiki/index.php/SPI_LCD Regards Johan > Hello 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 > > Am 2014-08-31 13:18, schrieb Prof. Dr. Christian Baun: >> Hi 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 >> >> ------------------------------------------------------------------------------ >> Slashdot TV. >> Video for Nerds. Stuff that matters. >> http://tv.slashdot.org/ >> _______________________________________________ >> Lcd4linux-users mailing list >> Lcd...@li... >> https://lists.sourceforge.net/lists/listinfo/lcd4linux-users >> >> > |
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From: Prof. D. C. B. <wol...@gm...> - 2014-08-31 20:12:08
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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 2014-08-31 20:49 GMT+02:00 Johan Swenker <joh...@xs...>: > Hi, > > 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 > to the RPi. For example: > 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 > adding a microcontroller board to the LCD). Among them: > http://www.bitwizard.nl/wiki/index.php/SPI_LCD > > Regards Johan > >> Hello 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 >> >> Am 2014-08-31 13:18, schrieb Prof. Dr. Christian Baun: >>> >>> Hi 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 >>> >>> >>> ------------------------------------------------------------------------------ >>> Slashdot TV. >>> Video for Nerds. Stuff that matters. >>> http://tv.slashdot.org/ >>> _______________________________________________ >>> Lcd4linux-users mailing list >>> Lcd...@li... >>> https://lists.sourceforge.net/lists/listinfo/lcd4linux-users >>> >>> >> > |
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From: Michael R. <mi...@re...> - 2014-09-03 12:08:39
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Am 2014-08-31 20:49, schrieb Johan Swenker: > Hi, > > 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. I fully agree. But lcd4linux (and the HD44780 driver) does not support driving a display with GPIO pins, because yesteryear we did not have them. > The same search engine will also be able to find you several LCDs with an I2C interface (implemented by > adding a microcontroller board to the LCD). Among them: http://www.bitwizard.nl/wiki/index.php/SPI_LCD using kind of a converter (e.g. LCD2USB) would also be a proper solution. I think the HD44780 driver supports i2c, too (but I'v enever used it) regards, Michael -- Michael Reinelt <mi...@re...> http://home.pages.at/reinelt GPG-Key 0xDF13BA50 ICQ #288386781 |
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