Tiny Core Linux

Tiny Core Base => Raspberry Pi => Topic started by: thomka on February 21, 2014, 04:39:25 PM

Title: HD44780 display does not work (GPIO question)
Post by: thomka on February 21, 2014, 04:39:25 PM

Hi TC Community,

Im planning to build an small and tiny streaming client on a tinycore basis. I therefore used tc and tried to attach a HD44780 based display.

I have installed python, pathon-dev and python-GPIO via tce and then I plugged in the HD44780 display ( Frizing: http://www.schnatterente.net/img/articles/raspberrypi-display/raspberry-pi-display-aufbau.png) afterwards I have used the testscript from schnatterente.net (wget http://www.schnatterente.net/code/raspberrypi/displaytest.py), but there was nothing on the display.

Do you have any idea, what I have done wrong? Is it enough to install the above mentioned packages?

thanks and best regards,
Thomas

Title: Re: HD44780 display does not work (GPIO question)
Post by: Rich on February 21, 2014, 05:34:18 PM

Hi thomka
That's not much to go on. Did you get any error messages when you ran the script? What is the script supposed to display?
I don't do Python but it looks to me like that script is supposed to display 16 blank characters.

Title: Re: HD44780 display does not work (GPIO question)
Post by: thomka on February 22, 2014, 03:51:18 AM

Hi Rich,

Normally the script should show the "lcd_string" messages.
I ran the script some weeks ago under raspian and it works.


No there are no error messages.

It runs for about 10 seconds and then it ends.

Br

Thomas


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Title: Re: HD44780 display does not work (GPIO question)
Post by: bmarkus on February 22, 2014, 05:16:26 AM

Updated python-RPi.GPIO.tcz to version 0.5.4

Are you running the script as root?

Title: Re: HD44780 display does not work (GPIO question)
Post by: thomka on February 23, 2014, 12:55:43 PM

Hi Markus, I started it with sudo




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Title: Re: HD44780 display does not work (GPIO question)
Post by: bmarkus on February 23, 2014, 02:07:01 PM

Which piCore version are you using?

Title: Re: HD44780 display does not work (GPIO question)
Post by: thomka on February 24, 2014, 11:07:26 AM

Hi Markus,

uname -a shows following:

"Linux piCorePlayer 3.12.9-piCore #1 PREEMPT Sun Feb 9 09:42:09 CET 2014 armv6l GNU/Linux"

BR,
Thomas

Title: Re: HD44780 display does not work (GPIO question)
Post by: thomka on February 24, 2014, 11:41:07 AM

no changes with "python-RPi.GPIO.tcz version 0.5.4"