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Re: [lcd4linux] LCD4Linux Help!
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From: Michael R. <mi...@re...> - 2015-02-16 16:27:53
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Hello Matthew,
do you have a oscilloscope or something?
I guess either the wiring os wrong, or soemthing is wrong with your parport.
are you sure you have the RW line connected properly?
From the warnings in the log, the display does not return the busy-flag (which is ok if you don't use busyflag
checking), but it may be a hint that something is very basically wrong.
checking some of the signals on the parallel port with a oscilloscope could help a lot, we don't need deep timing or
signal nalysis, just knowing that the signal on some pins is "moving"
regards, Michael
Am 2015-02-16 um 11:04 schrieb Matthew Hodder:
> Hi all,
>
> Hoping someone can point me in the right direction.
>
> I'm running LCD4Linux on a Sophos UTM box (Suse base), I suspect I may have a dud parallel port, but wanted someone
> elses thoughts.
>
> LCD4Linux is compiled with just the HD44870 driver, I'm doing a basic config just to prove I can get a display up on the
> LCD. I have double/triple checked wiring and I'm sure I have it right.
>
> My config file looks like this:
>
> ----------------------------------------------------------------
>
> Display HD44780-winamp {
> Driver 'HD44780'
> Model 'generic'
> UseBusy 1
> Port '/dev/parport0'
> Size '16x2'
> Wire {
> RW 'AUTOFD'
> RS 'INIT'
> ENABLE 'STROBE'
> ENABLE2 'GND'
> GPO 'GND'
> }
> }
>
>
> Widget MEM {
> class 'Text'
> expression meminfo('MemTotal')/1024
> prefix 'MB:'
> width 11
> align 'L'
> precision '0'
> update 1000
> }
>
> Layout Default {
> Row1 {
> Col1 'MEM'
> }
> }
>
> Display 'HD44780-winamp'
> Layout 'Default'
>
> ----------------------------------------------------------------
>
> When I run it using: sudo /sbin/lcd4linux -Fvv
>
> I get the following:
>
> ----------------------------------------------------------------
>
> Version 0.11.0-SVN-965 starting
> lcd4linux.c: initializing driver HD44780
> HD44780: $Rev: 905 $
> HD44780: using model 'generic'
> HD44780: using parallel port
> HD44780: using 1 Controller(s)
> HD44780: using 8 bit mode
> udelay: using gettimeofday() delay loop
> HD44780: using ppdev /dev/parport0
> HD44780: wiring: DISPLAY:RS - PARPORT:INIT (Pin 16)
> HD44780: wiring: DISPLAY:RW - PARPORT:AUTOFD (Pin 14)
> HD44780: wiring: DISPLAY:ENABLE - PARPORT:STROBE (Pin 1)
> HD44780: wiring: DISPLAY:ENABLE2 - PARPORT:GND
> HD44780: wiring: DISPLAY:ENABLE3 - PARPORT:GND
> HD44780: wiring: DISPLAY:ENABLE4 - PARPORT:GND
> HD44780: wiring: DISPLAY:BACKLIGHT - PARPORT:GND
> HD44780: wiring: DISPLAY:GPO - PARPORT:GND
> HD44780: wiring: DISPLAY:GPI - PARPORT:GND
> HD44780: wiring: DISPLAY:POWER - PARPORT:GND
> HD44780: timing: CY = 1000 ns (default)
> HD44780: timing: PW = 450 ns (default)
> HD44780: timing: AS = 140 ns (default)
> HD44780: timing: AH = 20 ns (default)
> HD44780: timing: INIT1 = 4100 us (default)
> HD44780: timing: INIT2 = 100 us (default)
> HD44780: timing: EXEC = 80 us (default)
> HD44780: timing: WRCG = 120 us (default)
> HD44780: timing: CLEAR = 2250 us (default)
> HD44780: timing: HOME = 2250 us (default)
> HD44780: timing: ONOFF = 2250 us (default)
> HD44780: using busy-flag checking
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: timeout waiting for busy flag on controller 1 (0xff)
> HD44780: too many busy flag failures, turning off busy flag checking.
> HD44780: using 0 GPI's and 0 GPO's
> initializing layout 'Default'
> widget 'MEM': Class 'text', Parent '<root>', Layer 1, Row 0, Col 0
> lcd4linux.c: starting main loop
>
> ----------------------------------------------------------------
>
> But nothing ever displays on the LCD. I get the above regardless if the LCD is connected or not, so I simply don't think
> it is seeing the LCD at all. I have tried two different LCDs as well with the same result
>
> Any pointers from here or how I can trouble shoot further?
>
> Thanks in advance!
>
> Regards,
> Matt Hodder
>
>
> ------------------------------------------------------------------------------
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--
Michael Reinelt <mi...@re...>
http://home.pages.at/reinelt
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