lcd4linux-users

[lcd4linux] Samsung 0282A shows underscores only

[Ansgar K. <kon...@it...>]

Hi all,

I'm having a problem with a 24x8 character LCD, M50530-based, type
Samsung 0282A.

After power-on, it displays two lines of underscores (lines one and four).

I was unable to display any data using this module.

Some connection details:

LCD -- LPT
Pin 1 (Shield) -> GND
Pin 10 (EX) -> Strobe (1)
Pin 13 (IOC1) -> /Autofeed (14)
Pin 11 (RW) -> Init (16)
Pin 12 (IOC2) -> Select In (17)

Any hints?

Thanks in advance,

Ansgar

Re: [lcd4linux] Samsung 0282A shows underscores only

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

Hi Ansgar,

> I'm having a problem with a 24x8 character LCD, M50530-based, type
> Samsung 0282A.
> 
> After power-on, it displays two lines of underscores (lines one and four).

I do remember having the same problem, but unfortunately I can't 
remember the solution :-( Probably it was a wiring fault...

> Some connection details:
> 
> LCD -- LPT
> Pin 1 (Shield) -> GND
> Pin 10 (EX) -> Strobe (1)
> Pin 13 (IOC1) -> /Autofeed (14)
> Pin 11 (RW) -> Init (16)
> Pin 12 (IOC2) -> Select In (17)

Did you specify this wiring in the config file, too?

If this doesn't help, could you send us the output of 'lcd4linux -Fvv'?


bye, Michael

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

Re: [lcd4linux] Samsung 0282A shows underscores only

[Ansgar K. <kon...@it...>]

Hi Michael,

thanks for your help :-)

Michael Reinelt schrieb:

>> Some connection details:
>>
>> LCD -- LPT
>> Pin 1 (Shield) -> GND
>> Pin 10 (EX) -> Strobe (1)
>> Pin 13 (IOC1) -> /Autofeed (14)
>> Pin 11 (RW) -> Init (16)
>> Pin 12 (IOC2) -> Select In (17)
> 
> Did you specify this wiring in the config file, too?

Yes, this is the Wire section copied from the config file:

Wire {
    RW      'INIT'
    EX      'STROBE'
    IOC1    'AUTOFD'
    IOC2    'SLCTIN'
    GPO     'GND'
}

I already checked the wiring more than three times. :-( This drives me
mad, somehow...

> If this doesn't help, could you send us the output of 'lcd4linux -Fvv'?

Here it is:

Version 0.10.0 starting
lcd4linux.c: initializing driver M50530
M50530: using model 'generic'
M50530: using 192 words DDRAM / 64 words CGRAM (8 user chars)
M50530: using duty 2: 1/24, 4 lines x 48 words
M50530: controlling 0 GPO's
udelay: CPU supports Time Stamp Counter
udelay: CPU runs at 807.340000 MHz
udelay: using TSC delay loop, 808 ticks per microsecond
M50530: using ppdev /dev/parport0
M50530: wiring: [DISPLAY:EX]<==>[PARPORT:STROBE (Pin 1)]
M50530: wiring: [DISPLAY:IOC1]<==>[PARPORT:AUTOFD (Pin 14)]
M50530: wiring: [DISPLAY:IOC2]<==>[PARPORT:SLCTIN (Pin 17)]
M50530: wiring: [DISPLAY:GPO]<==>[PARPORT:GND]
drv_M50530.c: SET FUNCTION MODE 0xfa
initializing layout 'Default'
lcd4linux.c: starting main loop

To me, this looks quite all right, doesn't it?

Kind regards

Ansgar