english/Manual in german

I bought a 20×4 Display with the HD44780-port.

The intension was to show information of a running OPENELEC (with Kodi/XBMC) on a display with HD44780-port.

2013-09-13 18.05.10

2013-09-13 18.05.40

 

The following table shows the wiring between Raspberry Pi and the Display.

HD44780 Pin Nr. Symbol Function RaspberryPi Pin RaspberryPi Symbol
1 VSS Power supply GND 6 GND
2 VDD Power supply +5V 2 +5V
3 V0 Contrast-voltage 6 GND
4 RS H=Data Register (RW); L=Instruction Register 26 GPIO 7
5 R/W Data managment line:H=Read; L=Write 6 GND
6 E Signal Enable 24 GPIO 8
7 DB0 Data line 0
8 DB1 Data line 1
9 DB2 Data line 2
10 DB3 Data line 3
11 DB4 Data line 4 22 GPIO 25
12 DB5 Data line 5 18 GPIO 24
13 DB6 Data line 6 16 GPIO 23
14 DB7 Data line 7 12 GPIO 18
15 LED+ Background-illumination + 2 +5V
16 LED- Background-illumination GND 6 GND

Between Pin3(HD44780) and PIN6(RPI) is a 10kOhm-Poti connected in order to adjust the contrast (required for must LCD, but not for VFD).

between Pin15(HD44780) und PIN2(RPI) is a 1kOhm-Poti connected to adjust the background-illumination.

At the beginning I made a small perboard for testing. Later I designed a pcb and milled it to build a more funded design.

 

Activating the Display

The following steps are required to activate the Display under Openelec with Kodi(XBMC):

  • I performed the download of the following three files
    • HD44780.so (HD44780 driver for Raspberry Pi)
    • HD44780.so (HD44780 driver for Raspberry Pi 2)
    • LCD.xml (LCD configuration file)
    • LCDd.conf (file to define witch content to display)
  • Transfer (copy) these three files to the SD-cart of you Raspberry to : “\\OPENELEC\downloads” (Please scroll down this page to find “Somes additional hints”)
  • Copy the LCDd.conf in the console using cp /storage/downloads/LCDd.conf /storage/.config/LCDd.conf.
    • If you didn´t use my file , search in the LCDd.conf the row DriverPath=/usr/lib/lcdproc/ and change it into DriverPath=/storage/downloads/.
    • then change the row Driver=*** to Driver=HD44780.
    • After that search the chapter ## Hitachi HD44780 driver ## und cange the follow Parameter
    • ConnectionType=rpi (for Raspberry Pi)
      ConnectionType=raspberrypi
      (for RaspberryPi 2)
    •  Size=20×4 (the size of your Display: number of characters x number of lines)
    •  GPIO-Ports can be assigned with:
      • D7=18
      • D6=23
      • D5=24
      • D4=25
      • RS=7
      • EN=8
      • The Number after the “=” is the GPIO-number and not the pin-number of the connector P1 on the Raspberry.
        (in example: D7=18 is GPIO18 and Pin12 at connector P1 on the Raspberry.)
  • In the Openelec-Setting of Kodi(XBMC) enable the LCD driver support and select the LCD-Driver “HD44780”.
  • In the ADD-ONs under services, download and activate “XBMC-LCDproc” (Later on you can configure in this ADD-ON settings like scroll speed and update interval.)
  • Reboot the Raspberry.

Now the Display should be working.

  • If the Display is not working, open a terminal or console and type the command LCDd -c /storage/.config/LCDd.conf -dhd44780-s true. It should respond with GPIO mapping information. This step is necessary especially if you corrupted your “LCDd.conf” by typo errors in-between or if it was not found during startup.
  • Reboot the Raspberry

In the file /storage/.kodi/userdata/LCD.xml you can edit what the display is showing. (In some older releases of OPENELEC with XBMC the path is: /storage/userdata/LCD.xml).

During startup it will take a few seconds until the display will begin to show its first characters.

During reboot of your Raspberry the Display is showing a readout of the loaded driver for a few seconds.

Have fun!

My files to download:

HD44780.so for Raspberry Pi

HD44780.so for Raspberry Pi 2

LCD.xml

LCDd.conf

 

Some additional hints:

Under Windows you can connect to the SD card of your Raspberry via “mapping a network drive” (smb) if your computer and your Raspberry are connected to the same network.

For Linux users the connection type SSH should be preferred.

Login is: “root”, PW: “openelec”.

The program “Putty” can be used to open a console from your PC on you Raspberry.

On some LCDs you need to adjust the contrast signal a lot (poti) in order to get any readout. Otherwise you risk to start trouble shooting at the wrong end.

 

VF-Display can be used as well as longs as it supports the HD44780 protocol. The Activation is the same. The wiring is almost the same (i.e no contrast signal).

A very big “Thank You” to Sven Georgi for his help to test and correct my manual.

Facebook Comments