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PDF GLK12232-25 Data sheet ( Hoja de datos )
| Número de pieza | GLK12232-25 | |
| Descripción | Technical Manual | |
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GLK12232-25
User Manual
1 page  
Command Set
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Basic Operation
The operation of the GLK12232-25 is simple and user friendly. By transmitting commands listed within this section of the
manual the user is able to display text, graphics, and primitives. The user can also alter the screen or behavior of the GLK
by transmitting certain commands.
Writing Text to the Display
When the display receives a character, it then displays that character at the position currently defined. The next character
sent to the module then advances to the following position on the display. Characters are drawn using the currently selected
font, and only characters defined by the current font are actually processed. Characters that are not defined by the current
font are ignored, and the positioning is not advanced for the next character.
The position where text is to be displayed is a single pixel location stored in the GLK's volatile memory and maintained
internally by the GLK's firmware. It can be manually manipulated with two commands. One command positions the
characters using a text oriented coordinate system, dividing the display into character cells. The other command positions
the character at a specific pixel, allowing more "fine grained" control when needed.
Commands
To access the GLK's features and use the command set the user must sent a command prefix byte followed by a command
byte. Some commands require parameters, and are not executed until all parameters are received. Others require no
additional information and are executed immediately when received.
The command prefix is the single byte 0xFE (decimal 254). Sending the command prefix to the GLK instructs it to await
another byte containing the command that needs to be executed. When the GLK receives the command byte, it will either
act on the command immediately if parameters are not necessary, or will wait for more data if parameters are required.
Contained within the command set of the GLK12232-25 are basic commands, advanced commands, and graphic com-
mands. Basic commands include instructions such as "Set Current Text Position", "Clear Display", and "Set Contrast" along
with various other primary commands. The advanced commands provide access to more complex features, such as "Set
Font Metrics" and "Set RS-232 Port Speed" the functions of these types of commands are usually management of graphics,
memory, configuration and fonts. The graphics command section of the command set covers areas that are mainly limited
to graphics displays. "Draw Line", "Draw Rectangle" and "Display Saved Bitmap" are examples of these specialized com-
mands.
Basic Commands
All commands are prefixed by the command 0xFE, Hex FE, Decimal 254
Auto Repeat Mode On
ASCII '~', Hex 7E, Decimal 126
Syntax 0xFE 0x7E
To turn auto repeat on and select mode, send a command prefix followed by the character '~', followed by either 0x00 or
0x01:
= 0: 200ms typematic rate
= 1: Key down / Key up codes are sent
In either case, auto repeat is turned on.
Please see details in Keypad Interface section.
5
5 Page 
Set Drawing Color
ASCII 'c', Hex 63, Decimal 99
Syntax 0xFE 0x63 <color>
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This command sets the drawing color for subsequent graphic commands that do not have the drawing color passed as a
parameter. The parameter <color> is the value of the color where white 0 Hex, and black is 255 Hex.
Draw Line
ASCII 'l', Hex 6C, Decimal 108
Syntax 0xFE 0x6C <color><x1><y1><x2><y2>
This command will draw a line using color <color> from (<x1>,<y1>) to (<x2>,<y2>). This command will not alter
the global drawing color set by the 'c' command. Lines may be drawn from any part of the display to any other part, but may
be important to note that the line may interpolate differently right to left, or left to right. This means that a line drawn in
white from right to left may not fully erase the same line drawn in black from left to right.
Continue Line
ASCII 'e', Hex 65, Decimal 101
Syntax 0xFE 0x70 <x><y>
This command will draw line with the current drawing color from the last line end (<x2>,<y2>) to (<x>,<y>). This
command uses the global drawing color so the 'c' command should be used before the first line segment if required.
Put Pixel
ASCII 'p', Hex 70, Decimal 112
Syntax 0xFE 0x70 <x><y>
This command will draw a pixel at (<x>,<y>) using the current drawing color
Draw Rectangle
ASCII 'r', Hex 72, Decimal 114
Syntax 0xFE 0x72 <color><x1><y1><x2><y2>
This command will draw a solid rectangle using color <color> from (<x1>,<y1>) to (<x2>,<y2>) (bottom right).
Draw Square
ASCII ‘x’, Hex 78, Decimal 120
Syntax 0xFE 0x78<color><x1><y1><x2><y2>
To draw a square, send a command prefix followed by the character ‘x’. The user must then specify the <color> of the
square and the position of the square on the GLK screen. The position of the square is set by pixels (<x1>,<y1>) being
the top left and (<x2>,<y2>) being the bottom right. This command will draw a solid square.
Initialize Bar Graph
ASCII 'g', Hex 67, Decimal 103
Syntax 0xFE 0x67 <reference number><type><x1><y1><x2><y2>
This command initializes a bar graph referred to by number <reference number> of type <type> with size from
(<x1>,<y1>) (top left) to (<x2>,<y2>) (bottom right). A maximum of 16 bar graphs with reference numbers from 0 to
15 can be initialized as:
Vertical bottom referenced (<type> = 0)
Vertical top referenced (<type> = 2)
Horizontal left referenced (<type> = 1)
Horizontal right referenced (<type> = 3)
The bar graphs may be located anywhere on the display, but if they overlap, they will not display properly. Note: it is
important that <x1> is less than <x2>, and <y1> is less than <y2>.
11
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