xref: /linux/Documentation/admin-guide/lcd-panel-cgram.rst (revision c79c3c34f75d72a066e292b10aa50fc758c97c89)
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2Parallel port LCD/Keypad Panel support
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4
5Some LCDs allow you to define up to 8 characters, mapped to ASCII
6characters 0 to 7. The escape code to define a new character is
7'\e[LG' followed by one digit from 0 to 7, representing the character
8number, and up to 8 couples of hex digits terminated by a semi-colon
9(';'). Each couple of digits represents a line, with 1-bits for each
10illuminated pixel with LSB on the right. Lines are numbered from the
11top of the character to the bottom. On a 5x7 matrix, only the 5 lower
12bits of the 7 first bytes are used for each character. If the string
13is incomplete, only complete lines will be redefined. Here are some
14examples::
15
16  printf "\e[LG0010101050D1F0C04;"  => 0 = [enter]
17  printf "\e[LG1040E1F0000000000;"  => 1 = [up]
18  printf "\e[LG2000000001F0E0400;"  => 2 = [down]
19  printf "\e[LG3040E1F001F0E0400;"  => 3 = [up-down]
20  printf "\e[LG40002060E1E0E0602;"  => 4 = [left]
21  printf "\e[LG500080C0E0F0E0C08;"  => 5 = [right]
22  printf "\e[LG60016051516141400;"  => 6 = "IP"
23
24  printf "\e[LG00103071F1F070301;"  => big speaker
25  printf "\e[LG00002061E1E060200;"  => small speaker
26
27Willy
28