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PostPosted: Tue Dec 14, 2004 15:44 
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Joined: Tue Dec 14, 2004 15:39
Posts: 2
Hi everybody, I hooked up my nokia 3310 screen to my parallel port, and it works, however after about 30 seconds, the lcd gets blank. I downloaded a parallel port monitor and discovered that after about 30 sec. D0-D7 get low, and then turn high again. Does anyone know what is causing my port to do this? I tried different parallel port settings but that doesn't help.

Gideon


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PostPosted: Thu Dec 16, 2004 22:32 
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Joined: Sun May 05, 2002 22:05
Posts: 2063
Location: Lappeenranta, Finland
Do you have some printer drivers installed that are using the LPT port ? Just guessing here but sounds like something else could be accessing the port also.
Anyone else seen similar behaviour ?


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PostPosted: Wed Dec 22, 2004 20:36 
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Joined: Tue Dec 14, 2004 15:39
Posts: 2
No, nothing, that is what I thought of first. I did have a parallel fingerprintscanner, but after I formatted, the problem remains ( and it is pissing me off big time because nobody knows what the problem is :( )
Gideon


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PostPosted: Thu Dec 30, 2004 20:16 
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Joined: Sun May 05, 2002 22:05
Posts: 2063
Location: Lappeenranta, Finland
Here is mentioned something about XP doing writes to the port:
http://www.lvr.com/jansfaq.htm

Quote:
Q: If a logic 1 is written to the Control Port, bit 0, (Strobe), the PC clears all of the port bits once every five seconds for about a minute.

A: Some versions of Windows XP look for devices by periodically writing to the port. A registry key can disable this behavior.

The following registry setting disables the port writes:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Parport\Parameters]
"DisableWarmPoll"=dword:00000001

The following registry setting enables the port writes:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Parport\Parameters]
"DisableWarmPoll"=dword:00000000

You can make these changes in Windows' regedit utility. Or to make the changes automatically, create and save the following text files:

DisableWarmBoot.reg contains the following text:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Parport\Parameters]
"DisableWarmPoll"=dword:00000001

EnableWarmBoot.reg contains the following text:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Parport\Parameters]
"DisableWarmPoll"=dword:00000000

To change a registry key, run the program.

As always, use caution when working with the registry, which contains critical values for configuring and running the PC.

After making a change, reboot the PC.


Disabling the port writes can also eliminate port timeout errors received in some applications.

Thanks to Richard Shotbolt for informing me of this fix.


I don't know if this has anything to do with it though.


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