Remote-processing RPC-2350 Bedienungsanleitung PDF herunterladen (Seite 63)

GRAPHIC DISPLAY PORT CHAPTER 15

15-2

POKE SYS(15),0,0 :'Slow- no sparkle

There is an unfor tunate par adox beca use of this. Sparkle

is most noticeable when displays are updated fr equently

(5 times/second). The problem is when you want them

updated without sparkle, it takes more time.

NOTE: Sparkle suppression (default CAMBASIC

mode) can be a problem w hen wr iting lots

of text and when performing multitasking.

Writing text for 1/10 second means during

this time, all other interrupts are put on

hold for that time (interrupt latency). You

may have to sacrifice screen clarity for

speed.

Sparkle may not be objectionable in your application. It

is most noticeable on EL displays and when updating a

LCD screen with reverse (white block with black

lettering) character s.

Sparkle suppression is not completely eliminated when

enabled. You will still see random bars flickering

around the screen.

CONNECTING A DISPLAY

Operating a display is as simple as plugging the display

cable into the appropriate connector. See Figure 15-1

above for connector locations. The RPC-2350G

automatically initializes the controller on power up. A

blinking cursor is displayed in the upper left corner of

the screen.

Make sure the board works as described in Chapter 2,

Setup and Operation, before connecting any display.

LCD Display

The LCD display plugs into J9. Back light inverter is

connected separately to the + 5V and GND terminals on

P2.

The Back light inverter may be powered ON or OFF

under software control by connecting its ground to P2

terminal marked “ SWPW R” (P 2-1). This is a high

current switch to ground. By default, it is off. To turn

on, execute the BA SIC statem ent:

OUT &E7,1

To turn the inverter off, execute

OUT &E7,0

Initially connect the Back light inver ter ground lead to

“GND” on P2 or your pow er supply.

Orient the display so the back light cable (2 wire) and

lamp are on the right side, when viewing the display

from the front.

When you power up the boar d, the graphics controller is

initialized to display a blinking cursor in the upper left

corner. You should see a white light coming from the

back light lamp on the right side.

The back light requir es some w arm up time (about a

minute) in order for the display to be read able. A djust

contrast pot R30 for optimal view ing contrast.

EL Display

The EL display connects to J13. Connec tion is one to

one using a 2 mm ribbon cable.

External + 12V power must be applied to P2 terminal

marked “ELPW R”. This is necessary for display

power. You can connect this same + 12V power to the

“7-30V” terminal to power the board, if desired.

When you power up the boar d, the graphics controller is

initialized to display a blinking cursor in the upper left

corner

Verify operation - both display types

Chances are if you have the blinking cursor, the display

is going to wor k. A quick way to verify operation is to

type the following line in the immediate mode.

DISPLAY “Hello world”

The message should be displayed on the top line. The

cursor should be blinking on the next line down.

You can execute any of the display commands in the

immediate mode as well while running. F or exam ple, if

you want to draw a lighted box, execute:

DISPLAY F(100,100),(120,120)

A list of graphics programs is shown at the end of this

chapter. D ownload them to see how they display and

are program med.

DISPLAY LAYERS

There are two display layers: graphics and character.

Each layer is ‘OR ’ed’ with the o ther, meaning that a

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