Hd44780

DebianUser · 08-10-2010, 11:29 AM

I'm trying to get a HD44780 compatible display working on Debian

lsusb
Bus 001 Device 026: ID 0403:c630 Future Technology Devices International, Ltd lcd2usb interface

dmesg
[43112873.190000] usb 1-2.2: new low speed USB device using ehci_hcd and address 26
[43112873.420000] usb 1-2.2: configuration #1 chosen from 1 choice
[43112873.430000] usb 1-2.2: New USB device found, idVendor=0403, idProduct=c630
[43112873.440000] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[43112873.450000] usb 1-2.2: Product: LCD2USB
[43112873.450000] usb 1-2.2: Manufacturer: Lcdmod Kit

messages
[43112873.190000] usb 1-2.2: new low speed USB device using ehci_hcd and address 26
[43112873.420000] usb 1-2.2: configuration #1 chosen from 1 choice
[43112873.430000] usb 1-2.2: New USB device found, idVendor=0403, idProduct=c630
[43112873.440000] usb 1-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[43112873.450000] usb 1-2.2: Product: LCD2USB
[43112873.450000] usb 1-2.2: Manufacturer: Lcdmod Kit

i've installed lcd4linux via apt-get however i'm now stuck as nothings created in /dev

michaelk · 08-10-2010, 12:03 PM

Post your /etc/lcd4linux.conf
Are you configured to use the lcd2usb driver?

The driver is built into lcd4linux. I've never used lcd4linux but it does not look like a /dev is actually created. http://ssl.bulix.org/projects/lcd4linux/wiki/LCD2USB

DebianUser · 08-10-2010, 01:13 PM

Hi

It's all very confusing actually ha here's my conf file

Code:

Display HD44780-20x2 {
    Driver  'LCD2USB'
    Model   'generic'
    UseBusy  1
    Port    '/dev/parport0'
    Size    '20x2'
    Wire {
        RW      'AUTOFD'
        RS      'INIT'
        ENABLE  'STROBE'
        ENABLE2 'GND'
        GPO     'GND'
    }
}


Widget CPU {
    class  'Text'
    expression  uname('machine')
    prefix 'CPU '
    width  9
    align  'L'
    update tick
}

Layout Default {
    Row1 {
        Col1 'CPU'
    }
}

Variables {
   tick 500
}

Display 'HD44780-20x2'
Layout  'Default'

lcd4linux
Error 15: 'problems getting a response from "localhost" on port 6600 : Connection refused'
Error: Cannot connect to MPD! Is MPD started?

I tried setting display to LCD2USB as well but same result, i'm gussing the port Port '/dev/parport0' is wrong but not sure how to find out what port my display is on?

michaelk · 08-10-2010, 01:42 PM

The link I posted has a display example for your device.

What linux distribution are you running and is the version of lcd4linux? mpd is a music player that can be controlled over ethernet.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=499055

DebianUser · 08-10-2010, 03:03 PM

I'm using LCD4Linux 0.10.1-RC2-796

lcd4linux -Fvvq

Version 0.10.1-RC2-796 starting
[KVV] Using station 89
[KVV] Using default port 80
[KVV] Using default refresh interval of 60 seconds
[KVV] Default abbreviation setting: off
Error 15: 'problems getting a response from "localhost" on port 6600 : Connection refused'
Error: Cannot connect to MPD! Is MPD started?
lcd4linux.c: initializing driver LCD2USB
LCD2USB: $Rev: 773 $
LCD2USB: scanning USB for LCD2USB interface ...
LCD2USB: scanning for bus id: 001
LCD2USB: scanning for device id: 055
LCD2USB: found LCD2USB interface on bus 001 device 055
LCD2USB: echo test successful
LCD2USB: firmware version 1.08
LCD2USB: installed controllers: CTRL0
LCD2USB: reserving 1 of 8 user-defined characters for icons
initializing layout 'Default'
lcd4linux.c: starting main loop

lcd4linux.conf

Code:

Display LCD2USB {
    Driver     'LCD2USB'
    Bus        '001'
    Device     '055'
    Size       '40x4'
    Contrast   250
    Brightness 200
    Icons      1
}

Display 'LCD2USB'
Layout  'Default'

Widget CPU {
    class  'Text'
    expression  uname('machine')
    prefix 'CPU '
    width  9
    align  'L'
    update tick
}

Backlight is on but screen is blank, also every time the lcd is plugged the 'device' number changes is there a way to change it to /dev/lcd for example?

michaelk · 08-10-2010, 03:47 PM

According to the documnetation the Bus and Device is only required for multiple lcd2usb interfaces.
From reading the documentation you should add a variables section if using tick or specify an update interval in milliseconds.

Code:

Variables {
   tick 500
}