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[Lcdproc] HD44780-winamp gets overflooded with Hearts after upgrading to CVS

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  • From: mail AT (Andrés Trapanotto)
  • Subject: [Lcdproc] HD44780-winamp gets overflooded with Hearts after upgrading to CVS
  • Date: Thu Mar 10 15:35:02 2005

Sven Mertens escribió:

> Andrés Trapanotto schrieb:
>> Sven Mertens escribió:
>> [For complete thread please refer to the archive]
>>>> Well, I was looking the code and I think that the problem is
>>>> that it is "clearing" the buffer with zero values
>>>> hd44780.c: Line 240:
>>>> memset(p->lcd_contents, 0, p->width * p->height);
>>>> then, lcdproc sets the zero character to be a heart and the
>>>> caracter generator show you a heart in every hole...
>>>> You can try changing the above line in this way:
>>>> hd44780.c: Line 240 (MODIFIED):
>>>> memset(p->lcd_contents, ' ', p->width * p->height);
>>>> So, the buffer will fills with spaces ascii=0x20 instead ascii=0x00
>>>> Change this, recompile, test and tell us your experience.
>>>> (Mantaining the right size=18x4 configuration)
>>> Hi!
>>> Thanks for your reply again. And sorry for the late answer.
>>> I changed line 240, changed back to the lcdproc root directory and
>>> did a
>>> make clean && ./configure --enable-drivers=hd44780,curses && make
>>> Lcdproc configured and compiled without any complainments.
>>> When the daemon was started, first the display was filled up with
>>> the wellknown hearts. In the second line I could "T 378" from the
>>> portsetting message.
>>> After two seconds the damoen initialized the serverscreen. Now I
>>> could see the "LCDProc Server" message in the first line, scrolling
>>> left and right. In the second line I could see "Clients: 0". The
>>> remaining parts of the the display were filled up with the hearts.
>>> Now, with every screenupdate, the display fills up with solid white
>>> blocks. Killing and starting the daemon again brought the same results.
>>> After that I tried typing the commands for cleaning, configuring and
>>> compiling one for one and didn't get another result. I even tried
>>> compiling with another character rather than ' '. I set 'x' in the
>>> line wich you specified to see if this changes something, but
>>> without any changes in the result. (I've set the char back to ' '
>>> after this experiment.) So I verified again (the third time ;) )
>>> that I modified the right file, in the right directory at the right
>>> line (240).
>>> Sorry to say your suggestion did not work. Is it possible that there
>>> is more than one line wich cleares the display/buffer? This would
>>> explain the fact that there are the hearts first and than the blocks.
>>> Greetings, Sven Mertens
>> Sorry, I was wrong :(
>> This driver implements two buffers "framebuf" and "lcd_contents",
>> and only write to the hd44780 the differences between them to save
>> resources and time.
>> Then, I told you that change a line that works on "lcd_contents"
>> and it had no effect over the showing text.
>> I'll try to do it better this time. In first, restore the line 240
>> to original cero value :|
>> If you see the HD44780_clear do the thing that I told you, It fills
>> framebuf with spaces :)
>> If you see it you'll find that the HD44780_icon function sets the
>> special caracter 0 to be the heart, and then If you see the screen
>> fullfilled with hearts is because the buffer is filled with zero
>> values ...
>> I was looking in the code but I haven't found the problem :(
>> You can try to put a printf ("%s", p->framebuf) in some place (at
>> the end of HD44780_flush for example) to see the framebuffer contents
>> or something better like some code that show the hexadecimal values
>> :) then you can check if it is happen the weird things that I'm
>> telling you ....
>> Then ... tell us the news :)
>> Best regards,
> Hi there!
> No matter with your wrong conclusion. Everybody makes mistakes, so
> don't think about it any more. I'm glad that theres's someone who's
> trying to help me. :)

ok :)

> So, back to topic :)
> I modified my hd44780.c like explained by you. I inserted the 'printf'
> right below the DEBUG message and before the '}' wich marks the end of
> HD44780_flush.

Well, in this case it is fine, but in other circunstances be sure of
put your modification before "return ;" line :)

> It compiled properly but didnt't show up with the framebuffer content.
> After that I placed the command at the beginning of the function. This
> gave me an error about an undeclared identifier. Sorry for beeing a
> bit stupid but I'm not familar with C / C++ programming, I have only
> experience with BASIC and PHP. :/
> Btw: Compiling with "--enable-debug" didn't gave a clue whats wrong. ;)

I'm not using it but try passing -r N to LCDd when executing it
where N is the report level desired.

> I also tried to place a "printf ("Test");" at some places in the
> funtion but the Message didnt't show up anywhere. (I tried to learn C
> a few months ago but failed due the lack of time. So far as I know
> this should print me a "Test" at the console but maybe I'm wrong with
> that. In that case just ignore it :).)

Use this:
fprintf (stderr, "\nTest");

fprintf (stderr,"%s", p->framebuf);

fprintf (stderr,"\n");
for (i=0; p->framebuf[i];i++)
fprintf (stderr, "0x%0X",p->framebuf[i]);

> Meanwhile I've resetted the display with a reboot of the PC wich it is
> connected to. Now, as mentioned in my previous post, the display does
> nothing when the daemons is started. It just shows me the two bright
> and the two dark lines to tell me it is correct connected to the power.
> I also tried to place your buffer message in various other places
> instead of the end of HD44780_flush. But it never showed up somewhere.
> Wether it is displayed on the console, nor i can see it at the display.
> Let me ask a stupid question: Is this function called somewhere? I
> don't know exactly what i does, but every change I made to it didn't
> show up in the compiled program. I ususally recompile with the
> following commandline:
> make clean && ./configure --enable-drivers=hd44780,curses && make
> After that i do a cd into the server's dir and start it with
> ./LCDd -c /etc/LCDd.conf
> To be sure I downloaded a fresh new tarball from the website, modified
> the hd44780.c as specified by you and compiled in a clean directory.
> With the same results.
> I just placed the printf command in HD44780_string to see if it may
> work. It didn't.
> So, I attached my modified hd44780.c (Sorry for any inconvinience) for
> you to look if I've done your modification as intended. Did I? If not
> so take my excuse and, please, explain me what I have done wrong. I
> yes, any more ideas?
It's ok, but I think that you forgot the attachment.
Please, try with the above "fprintf ()" and then we continues...

Good luck!!!

Técnico Andrés Trapanotto
Centro de Investigación Telecomunicaciones, Electrónica e Informática
Teléfono (54 11) 4724 6300 Interno 6362
mail AT
0800 444 4004 |

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