Matrix Orbital LK162-12 Legacy User Manual
Page 25
LK162-12 rev 4
25
Custom characters occupy a 5 x 8 pixel matrix. Built-in characters are 5 x 7: the bottom row of pixels is
normally reserved for the underline cursor. The underline cursor should be turned off if the bottom row of
pixels forms part of a custom character.
The characters are defined by issuing the command 254 78 [c] followed by 8 bytes to define the character.
[c] is the character number (0x00 to 0x07). The 8 bytes are mapped as shown below:
MSB
LSB
*
*
*
1
2
3
4
5
Data Byte 1
*
*
*
6
7
8
9
10
Data Byte 2
*
*
*
11 12 13 14
15
Data Byte 3
*
*
*
16 17 18 19
20
Data Byte 4
*
*
*
21 22 23 24
25
Data Byte 5
*
*
*
26 27 28 29
30
Data Byte 6
*
*
*
31 32 33 34
35
Data Byte 7
*
*
*
36 37 38 39
40
Data Byte 8
A "1" bit indicates an on (black) pixel, a "0" bit indicates an off (clear) pixel.
Once defined, a character is displayed simply by issuing a value (0x00 to 0x07) corresponding to the
character number. The character will be laid out as follows:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Cursor Line
Note: Custom characters will be erased if any of the "initialize bar graph" commands are issued.
Example of a degree symbol:
txUart.sendByte(0xFE); //command prefix
txUart.sendByte('N'); //custom character command
txUart.sendByte(0x00); //custom character value 0-7
txUart.sendByte(12); //8 bytes to create
txUart.sendByte(18); //the custom character
txUart.sendByte(18);
txUart.sendByte(12);