Remote Processing RPC-2350 - Manual (Page 62)

CHAPTER 15 GRAPHIC DISPLAY PORT
15-1
Figure 15-1 LC D and EL connector location
CHAPTER SYNOPSIS
GRAP HIC D ISPLAY PORT CHAP TER 15
Ž General display information
Ž Connect a display
Ž Display modes
Ž Printing text
Ž Make and load fonts
Ž Making, saving and loading screens
Ž Drawing points and lines
Ž ancillary screen control
Ž Load and save graphic screens
Ž Touch screen positioning
Ž C a b le a nd w ir i ng d ia g r am s
Ž Command summary
Ž A p pl ic a ti on p r og r a m s
DISPLAY INFORMATION
The RPC -2350 initializes the display controller for the
following type on power up:
O p tr e x D M F 50 1 74 3 20 x 24 0 pi xe l L C D
Planar EL320.240.36 320 x 240 pixel EL
The LC D plugs into J9. The EL display plugs into J13.
There are 3 character sizes available. Default character
set is 5 x 7 pixels. This set displays 30 rows of 40
characters / line. Most American ASCII characters are
displayed. The ‘\’ char acter is the yen symbol. ASC II
values 126 and 127 ar e displayed as
6 and 7
respectively.
Mediu m size is 10 x 16 pixels (0. 175" h eight). All
printable ASCII characters are available. This set
displays a maximum of 15 rows x 32 characters wide.
The lar gest size is 32 x 48 p ixels (0. 5" heig ht). A ll
ASCII cha racters ar e available. T his set displays a
maximum of 6 rows x 10 characters wide.
Medium and large char acters are tr eated as graphics.
They can be displayed in normal or rever se (light
border, black character ) mode. Fonts are stor ed in Flash
EPROM . You may change fonts as desired. See
"Changing and loading fonts" later.
Small character cursor position starts in the screen’s
upper left corner. Row, Column coordinates start at 0,0
and end at 45,29.
The contro ller is progra mmed for two planes. The first
plane is sma ll charac ters only. The seco nd plane is
larger character s and graphics. Each plane can be
independently turned on or off or flashed.
Display sn ow or spa rkle
Snow, or sparkle, were defined in the PC world as
extrane ous flashes of ligh t on the scre en. Sparkle
appeared during updates on PC’s. A similar
phenomenon can manifest itself on the RPC-2350G.
Instead of flashes of light, there are black or grey bars
randomly running around an LCD screen. These are
most noticeable in reverse character display mode.
Flashes of light are even more noticeable on EL
displays.
Sparkle is reduced by writing to controller memory
during the “up date” time. Unfor tunately this tends to
slow display updates considerably. Sparkle affects the
RPC-2350G only when drawing medium and large size
charac ters. It is especially notice able whe n printing in
reverse.
Update time can be critical. Typical times for pr inting 5
large ch aracter s is about 0. 1 second w ith sparkle
suppression. Without sparkle, the same characters are
printed in about 0.020 seconds. Medium size characters
take 2 times longer to print with sparkle suppression than
without.
Default C AM BASIC mode is m inimum sparkle. Sparkle
suppression can be temporarily turned off. This is done
by writing a 1 to the spar kle flag (using SYS(14) ). Use
the following progr am exam ples.
POKE SYS(15),1,0 :'Fast- w/ sparkle