lcd4linux-users

[lcd4linux] HD44780 lcd n/w

[Simon C. <sim...@ho...>]

hi all
small problem i have a REDHAT 9  2.4.20-8
i got the source got it going but my lcd will not work got xterm to work (no 
entries in stderr?)
and got the X11 too work great...

#lcd4linux -Fvv
version 0.9.11 starting
lcd4linux.c: initialising driver HD44780
HD:44780: controlling 0 GPOs
wiring: using display with 1 controllers
wiring: using 8 bit mode
wiring: [DISPLAY:RS]<==>[PARPORT:AUTOFD]
wiring: [display :rw ]<==>[parport:gnd]
wiring: [display:enable]<==>[parport:strobe]
wiring: [display:enable2]<==>[parport:select]
wiring: [display:gpo]<==>[parport:init]
udelay.c: cpu supports time stamp counter
udelay.c: cpu runs at 800.055000 mhz
udelay.c: using tsc delay loop,801 ticks per microsecond
parport.c using raw port 0x378
processor.c: Display: 4 rows, 20 columns, 5x8 pixels, 0 icons, 0 gpos
processor.c: ====================
processor.c: Timings:
processor.c: 500 msec text updates
processor.c: 100 msec bar  updates
processor.c: 100 msec icon updates
processor.c: 100 msec GPO updates
processor.c: -------------------------------
processor.c: 100 msec data collection
processor.c: 100 msec data processing
processor.c: =================
processor.c: Row1: ** %o %v **
processor.c: Row2: %p CPU %r MB RAM
processor.c: Row3: BUSY %cb%% $r 10cs+cb
processor.c: Row4: LOAD%1l%L$r10L1
lcd4linux.c:  starting main loop
system.c: open(/proc/loadavg)=3
system.c: open (/proc/stat)=4
system.c: uname(sysname)=Linux
system.c: uname(release)=2.4.20-8
system.c: uname(machine)=i686
system.c: sizeof(/proc/kcore)=135454720 bytes

i tried a 2x16 which had been working with a small pic micrcontroller and a 
new 4x20 also a hd44780

heres lcd4linux.conf

Display HD44780
Port 0x378
Size 20x4
Bits 8
Wire.RW "GND"               #RW (pin 5 lcd hardwired to ground)
Wire.RS "AUTOFD"           #RS  (pin 4 lcd to pin 14 DB-25 "Autofd")
Wire.ENABLE "STROBE"     #E (pin 6 lcd to pin 1 DB-25 "strobe")
Wire.GPO "INIT
Row1 "** %o %v **"
Row2 "%p CPU %r MB RAM "
Row3 "BUSY %cb%% $r 10cs+cb"
Row4 "LOAD%1L%L$r10L1    "


the data lines (DB0........DB7 on the display,DB1 ....DB8 on the parrallel 
port)are connected directly
RS pin 4 lcd to pin 14 "autofd"
RW hardwired to gnd
E pin 6 lcd to pin 1 DB-25

hope this can shed some light
thanks
Simon Clare

Re: [lcd4linux] HD44780 lcd n/w

[Michael R. <re...@eu...>]

Hi Simon,

> small problem i have a REDHAT 9  2.4.20-8
> i got the source got it going but my lcd will not work got xterm to work 
> (no entries in stderr?)
> and got the X11 too work great...

> #lcd4linux -Fvv
[...]
> wiring: [DISPLAY:RS]<==>[PARPORT:AUTOFD]
> wiring: [display :rw ]<==>[parport:gnd]
> wiring: [display:enable]<==>[parport:strobe]
> wiring: [display:enable2]<==>[parport:select]
> wiring: [display:gpo]<==>[parport:init]
looks good...

> heres lcd4linux.conf
[...]
> Wire.RW "GND"               #RW (pin 5 lcd hardwired to ground)
> Wire.RS "AUTOFD"           #RS  (pin 4 lcd to pin 14 DB-25 "Autofd")
> Wire.ENABLE "STROBE"     #E (pin 6 lcd to pin 1 DB-25 "strobe")
> Wire.GPO "INIT
looks good, too, but just to be sure, you should add/modify these two lines:
Wire.ENABLE2 "GND"
Wire.GPO "GND"

> the data lines (DB0........DB7 on the display,DB1 ....DB8 on the 
> parrallel port)are connected directly
> RS pin 4 lcd to pin 14 "autofd"
> RW hardwired to gnd
> E pin 6 lcd to pin 1 DB-25
looks correct, too.

so your wiring seems to be ok. You did double-check, did you?

Does the display work with some other software? (lcdproc, or windows..)

What happens on the display a) if you connect power to it, and b) when 
you start lcd4linux?

Hmmm.... maybe you're facing the problem that the display requires 5V on 
the data lines, but your parport provides only 3.3V?

bye, Michael

-- 
Michael Reinelt <re...@eu...>
http://members.eunet.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781

Re: [lcd4linux] HD44780 lcd n/w

[Simon C. <sim...@ho...>]

hi Michael thanks for your reply ..i tried the edited .conf as you said to 
no avail...when i power up the board no apparent change in lcd ...i will try 
rebuilding again i tried lcdsmartie still no go ...will keep you 
posted..thanks
any idea why i dont see anything in stderrr window when i run Xterm?..

>From: Michael Reinelt <re...@eu...>
>To: Simon Clare <sim...@ho...>
>CC: lcd...@li...
>Subject: Re: [lcd4linux] HD44780 lcd n/w
>Date: Wed, 22 Dec 2004 14:21:50 +0100
>
>Hi Simon,
>
>>small problem i have a REDHAT 9  2.4.20-8
>>i got the source got it going but my lcd will not work got xterm to work 
>>(no entries in stderr?)
>>and got the X11 too work great...
>
>>#lcd4linux -Fvv
>[...]
>>wiring: [DISPLAY:RS]<==>[PARPORT:AUTOFD]
>>wiring: [display :rw ]<==>[parport:gnd]
>>wiring: [display:enable]<==>[parport:strobe]
>>wiring: [display:enable2]<==>[parport:select]
>>wiring: [display:gpo]<==>[parport:init]
>looks good...
>
>>heres lcd4linux.conf
>[...]
>>Wire.RW "GND"               #RW (pin 5 lcd hardwired to ground)
>>Wire.RS "AUTOFD"           #RS  (pin 4 lcd to pin 14 DB-25 "Autofd")
>>Wire.ENABLE "STROBE"     #E (pin 6 lcd to pin 1 DB-25 "strobe")
>>Wire.GPO "INIT
>looks good, too, but just to be sure, you should add/modify these two 
>lines:
>Wire.ENABLE2 "GND"
>Wire.GPO "GND"
>
>>the data lines (DB0........DB7 on the display,DB1 ....DB8 on the parrallel 
>>port)are connected directly
>>RS pin 4 lcd to pin 14 "autofd"
>>RW hardwired to gnd
>>E pin 6 lcd to pin 1 DB-25
>looks correct, too.
>
>so your wiring seems to be ok. You did double-check, did you?
>
>Does the display work with some other software? (lcdproc, or windows..)
>
>What happens on the display a) if you connect power to it, and b) when you 
>start lcd4linux?
>
>Hmmm.... maybe you're facing the problem that the display requires 5V on 
>the data lines, but your parport provides only 3.3V?
>
>bye, Michael
>
>--
>Michael Reinelt <re...@eu...>
>http://members.eunet.at/reinelt
>GPG-Key 0xDF13BA50
>ICQ #288386781
>
>
>
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Re: [lcd4linux] HD44780 lcd n/w

[Michael R. <re...@eu...>]

Hi SImon,

> any idea why i dont see anything in stderrr window when i run Xterm?..

How do you start it? If you just run 'lcd4linux', all output goes to 
syslog anyway. If you use the '-F' option, there should be stdout and 
stderr output!


bye, Michael

-- 
Michael Reinelt <re...@eu...>
http://members.eunet.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781