Re: [lcd4linux] T6963 High CPU Usage....

[juergen <ju...@wi...>]

Hi Michael,

Michael Reinelt wrote:

> Hi Juergen,
>
>> i have some problems with the 0.9.11 Version.
>> Display Hitachi LMG7420 240x128pixel T6963 Chip.
>> Redhat 8 on a 466Celeron Maschine with 256MB Ram
>> lcd4linux.conf:
>>
>> Display TLC1091
>> Port 0x378 (/dev/ppdev does not work :-(   )
>
> It should be /dev/parport0 (old /dev structure) or /dev/parport/0 (devfs)
> No device!
>
>> Compilling is ok. But when I start lcd4linux the proggy needs up to 
>> 1min to Display something!
>> My CPU Usage is over 50% for lcd4linux!!!!
>> The last 4 columns are only mismatch... :-(
>
>
> Hmmm... my T6963 works fine, without noticeable CPU load (but I've 
> much faster machines than you).
>
> Could you try running lcd4linux with debug enabled (lcd4linux -Fvv) 
> and check for some strange errors?
>
Yes i do. See at the end of the Mail.

> Maybe you want to try the CVS version (but be warned that it is very 
> different from 0.9, take a look at lcd4linux.conf.sample)
>
Now, i try the CVS version since Yesterday.  It's exact the same Problem.

> Another point may be that the T6963 is very sensitive to signal 
> levels. It uses TTL levels (0V/5V), where many newer parallel ports 
> provide 3.3V only. I built a special circuits with two additional IC's 
> for this...

I check this! On my Athlon 1800+ / Epoxboard is no Problem, but with 
Windows an LCDHype. The Parallel port on this Board provide 5V.

>
> bye, Michael
>
Bye, Juergen