- From: andy at siliconlandmark.com (Andre Guibert de Bruet)
- Subject: [Lcdproc] picoLCD 4x20 only 19 chars
- Date: Sun, 23 Nov 2008 10:06:48 -0500
On Nov 22, 2008, at 7:33 PM, Ethan Dicks wrote:
>
On Sun, Nov 23, 2008 at 11:54 AM, <hansfong at zonnet.nl> wrote:
>
>
>
> I can only get 19 character displayed on my mini-box picoLCD 4x20.
>
> The last
>
> character on the first line shows three vertical lines (|||), on
>
> the other
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> lines the last character is blank. This is already the case when I
>
> start the
>
> deamon, so it seems not a client problem. I'm using lcdproc which I
>
> downloaded from the mini-box website, which is version 0.5.2. Any
>
> ideas?
>
>
I can't check specifically since I'm traveling and don't have my
>
picoLCD with me, but I did fix and submit a bug with the driver for
>
the 2x20 months ago that very specifically fixed writing to the full
>
width. I checked the CVS repository and I can't seem to find it.
>
>
In picoLCD_string(), I moved the line "x--; y--;" further up in the
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routine, between the boundary checking and the string-length check,
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IIRC.
>
>
If you compile with debugging on and start the server with debugging
>
turned up, you will probably see "%s: string overlength (>%d). Start:
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%d Length: %d (%s)" errors when trying to display 20-char-long
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strings.
>
>
I have a client I use for testing - it's really simple - open one
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string widget for each line on the display, then fill each character
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position with "X" and wait 30 seconds before quitting. It helps me
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find bugs like this, or with writing to the lower-right character
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position (especially when writing new drivers and having to get
>
line-scrolling parameters correct).
>
>
I should tidy that client up and submit it - it's really not complex,
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but it is very, very handy when debugging boundary conditions.
>
>
In any case, check your source for how picoLCD_string() goes - it's
>
probable that my last-char fix isn't in the codebase you are working
>
from.
I can confirm the problem WRT the last character on each line. In
fact, I was getting ready to report the issue myself.
Ethan - As far as your possible fix, I have not had the chance to give
it a spin. I will report back when I do.
Hans - Does setting Heartbeat=off make those three vertical lines turn
into a solid rectangle?
Cheers,
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