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Re: [lcd4linux] LCD4Linux Help!
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From: Matthew H. <ma...@ma...> - 2015-02-17 05:25:44
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Hi Michael,
Thanks for the quick reply, I don't have an oscilloscope unfortunately. I
am sure it is connected correctly, and I have traced the cable all the way
through via multimeter continuity testing.
Interestingly, I tried some other sample configs I found and I can get what
looks like a flash cursor every now and then. Also, when changing the
contrast, if I turn it to full, I get the top row blacked out, but only
HALF the second row!?
Totally confused now!
Is there any other way to do a signal test?
Cheers,
Matt
Regards,
Matthew Hodder
Mob: 0422 610 560
On 17 February 2015 at 02:10, Michael Reinelt <mi...@re...> wrote:
> 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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>>
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>>
>>
> --
> Michael Reinelt <mi...@re...>
> http://home.pages.at/reinelt
> GPG-Key 0xDF13BA50
> ICQ #288386781
>
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