Telcom Research CallShop FONE DISPLAY, Инструкция по установке и протоколу

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Page 10
Special Characters:
The “G” command allows creation of up to 8 special characters. These are characters that
do not exist as part of the standard ASCII character set. For instance, the dollar sign is ok if
you are working with dollars as this is a standard ASCII character, however if you are
working in Euro’s then the Euro symbol does not exist, so you need to create it your self.
The LCD display is made up of characters that are 8 dots high by 5 dots wide. For example:
Bit
4 3 2 1 0 Binary Hex FD Hex
01110 0x07 0x87
10001 0x11 0x91
10001 0x11 0x91
10001 0x11 0x91
11111 0x1F 0x9F
10001 0x11 0x91
10001 0x11 0x91
00000 0x00 0x80
You can see that the letter “A” is formed by dots. Each dot is either on (1) or off (0). The
“Binary” column is the binary value of the 0’s and 1’s required to form this character. The
“Hex” column is simply the hex version of this same value. The FD Hex column is simple the
Hex column with bit 7 always on (or if you prefer, in “C” terms, it is Hex | 0x80). To form
this character, you need to write 8 bytes of data 87; 91; 91; 91; 9F; 91; 91; 80.
To diagram below shows how you would form the Euro character.
Bit
4 3 2 1 0 Binary Hex FD Hex
00111 0x07 0x87
01000 0x08 0x88
11110 0x1E 0x9E
01000 0x08 0x88
11110 0x1E 0x9E
01000 0x08 0x88
00111 0x07 0x87
00000 0x00 0x80
To form this character, you need to write 8 bytes of data 87; 88; 9E; 88; 9E; 88; 87; 80.
The “G” command is used to send 8 special characters to the display memory. This equals
64 bytes of information.
Format:
Gabcdefgh <CR>
G = “G”