5.5.7 Set debounce time (254 85 [time])
[time] is in increments of 6554 microseconds.
This command sets the time between key press and key read. All key types with the exception of latched
piezo switches will ’bounce’ for a varying time, depending on their physical characteristics. The default
debounce time for the module is about 52 mS, which is adequate for most membrane keypads.
6 Fonts and Graphics Files
6.1 General
Matrix Orbital graphic modules contain a sophisticated file system for storing and retrieving font infor-
mation, bitmaps and system parameters; not unlike the way that a computer deals with files on a hard drive.
However, the modules use no moving parts, therefore, data is stored far more reliably than data on a home
PC.
Operationally, there is one important difference between the Matrix Orbital file system and that of a PC.
While a PC will allow fragmentation of its files across the available file space, the Matrix Orbital file system
takes great care to ensure that all parts of a file are stored together. This system works well to maximize
storage space and operational efficiency, however, during file downloads, the modules may need to spend
considerable time moving files to make room for the new file. This delay during download can be as much
as a minute, but generally it will not exceed 10 seconds.
When a file is being downloaded with the same ’name’ or reference number as a previously existing
file, the old file needs to be deleted first. We cannot know if the new file is exactly the same size as the old
file, since the space vacated by the old files is filled by moving previously existing files down to fill up the
vacated space. This ensures that no file space is wasted.
Of course, the average module will simply have files loaded into it and it will then get to work, without
ever having to perform this file reorganization task. The file space may be rewritten up to 100 000 times, but
most users will simply load in their fonts and bitmaps once and that will be it.
6.2 Using mogd.exe
The Matrix Orbital interface program "mogd.exe", which is provided on the disk and the website, gen-
erates and saves fonts larger than 14 pixels in height. It is also used to save graphic images (bitmaps) to the
display.
To make use of smaller fonts it is recommended that a pre-generated font be used. These fonts can
be located on the disk or the website. Unfortunately, integrating these fonts is not as straight forward as
generating the fonts. To make use of these fonts the user must place the font files in their font directory as
defined in the interface program. This directory can be found under "settings".
A font file consists of a single file with an extension.mgf and a directory which contains bitmaps for
every character. All .mgf files are contained within the font directory and all bitmap directories are sub
directories of the font directory. After download of a font file use a "Zip" program to "UnZip" the .mgf file
and bitmap sub-directory into the font directory. Start or restart mogd.exe and click on the font tab. The font
Matrix Orbital GLK12232-25-WBL 18
