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Rémi Heredero
188
Libs/Lcd_test/LCD_explanation.txt
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188
Libs/Lcd_test/LCD_explanation.txt
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-- filename: LCD_usage.vhd
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-- kind: txt file
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--------------------------------------------------------------------------------
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-- History:
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-- v1.0 : zas 22.08.2013 -- Initial Version
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--------------------------------------------------------------------------------
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-- Description:
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-- Explanation about the usage and the functionalities of the LCD Driver.
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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-- Overview
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--
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The Lcd and Lcd_test library is intended to use with the HEB_LCD_V2_0, see
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http://wiki.hevs.ch/uit/index.php5/Hardware/Parallelport/heb_lcd.
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The HEB_LCD_V2_0 features a EADOGM132-5 LCD. Its a 4 Line and 132 column black-
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light display. The font created for it uses 6 columns per character which allows
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to have 4 lines with 22 characters each.
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The connection is I2C based and some initial configuration needs to be done. The
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bloc lcdController has everything needed to use the LCD. See the vague toplevel
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overview below.
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+--------------------------------------------------------------------------+
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| +---------------------+ +----------------+ +---------------+ |
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| | lcdCharacterEncoder |---->| lcdInitialiser |------>| lcdSerialiser | |
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| +---------------------+ +----------------+ +---------------+ |
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| ^ |
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| | +-------------+ |
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| +--------| bramMemory | |
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| lcdController +-------------+ |
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+--------------------------------------------------------------------------+
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--------------------------------------------------------------------------------
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-- Bloc description
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--
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lcdController -- Main bloc containing all needed subblocs
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lcdCharacterEncoder -- This bloc receives the ASCII data to display and
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and converts it to display data or display commands
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bramMemory -- Contains the command for command chars (<0x20) and
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the display (pixel) data for a the symbol chars
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(>=0x20).
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All the data of this ram are stored inthe font.txt file
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lcdInitialiser -- This bloc lets send predefined commands for 2
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features. One is for initialising the display in the
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beginning, and the other is for clear all data from
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the display
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lcdSerialiser -- This bloc takes the parallised data and sends them
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over the I2C bus.
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--------------------------------------------------------------------------------
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-- Supported Characters
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--
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In VHDL the characters can be written with the following command:
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character'pos("VHDL")
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where VHDL is inidicated in the table below.
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Hex VHDL Value Description Function
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-----------------------------------------------------------
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0x00 "nul" Null Not supported
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0x01 "soh" Start of Header Not supported
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0x02 "stx" Start of Text (0,0) Goto pos line 0 character 0
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0x03 "etx" End of Text (3,21) Goto pos line 3 character 21
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0x04 "eot" End of Transmission Not supported
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0x05 "enq" Enquiry Not supported
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0x06 "ack" Acknowledgment Not supported
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0x07 "bel" Bell Not supported
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0x08 "bs" Backspace (y,x-1) Jump one char back
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0x09 "ht" Horizontal Tab Not supported
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0x0A "lf" Line Feed (y+1,x)Goto next line
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0x0B "vt" Vertical Tab (y-1,x) Goto previous line
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0x0C "ff" Form Feed Not supported
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0x0D "cr" Carriage Return (y,0) Goto beginning of line
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0x0E "so" Shift Out Not supported
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0x0F "si" Shift In Not supported
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0x10 "dle" Data Link Escape Not supported
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0x11 "dc1" XON Device Control 1 Not supported
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0x12 "dc2" Device Control 2 Not supported
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0x13 "dc3" XOFFDevice Control 3 Not supported
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0x14 "dc4" Device Control 4 Not supported
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0x15 "nak" Negativ Acknowledgemnt Not supported
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0x16 "syn" Synchronous Idle Not supported
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0x17 "etb" End of Trans. Block Not supported
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0x18 "can" Cancel Clear entire display
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0x19 "em" End of Medium Not supported
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0x1A "sub" Substitute Not supported
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0x1B "esc" Escape Not supported
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0x1C "fsp" File Separator Not supported
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0x1D "gsp" Group Separator Not supported
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0x1E "rsp" Reqst to SendRec. Sep. Not supported
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0x1F "usp" Unit Separator Not supported
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0x20 " " Space Print char
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0x21 "!" exclamation mark Print char
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0x22 """ double quote Print char
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0x23 "#" number sign Print char
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0x24 "$" dollar sign Print char
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0x25 "%" percent Print char
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0x26 "&" ampersand Print char
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0x27 "'" single quote Print char
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0x28 "(" left/open parenthesis Print char
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0x29 ")" right/closing parenth. Print char
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0x2A "*" asterisk Print char
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0x2B "+" plus Print char
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0x2C "," comma Print char
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0x2D "-" minus or dash Print char
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0x2E "." dot Print char
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0x2F "/" forward slash Print char
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0x30 "0" Print char
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0x31 "1" Print char
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0x32 "2" Print char
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0x33 "3" Print char
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0x34 "4" Print char
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0x35 "5" Print char
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0x36 "6" Print char
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0x37 "7" Print char
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0x38 "8" Print char
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0x39 "9" Print char
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0x3A ":" colon Print char
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0x3B ";" semi-colon Print char
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0x3C "<" less than Print char
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0x3D "=" equal sign Print char
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0x3E ">" greater than Print char
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0x3F "?" question mark Print char
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0x40 "@" AT symbol Print char
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0x41 "A" Print char
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0x42 "B" Print char
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0x43 "C" Print char
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0x44 "D" Print char
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0x45 "E" Print char
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0x46 "F" Print char
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0x47 "G" Print char
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0x48 "H" Print char
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0x49 "I" Print char
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0x4A "J" Print char
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0x4B "K" Print char
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0x4C "L" Print char
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0x4D "M" Print char
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0x4E "N" Print char
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0x4F "O" Print char
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0x50 "P" Print char
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0x51 "Q" Print char
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0x52 "R" Print char
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0x53 "S" Print char
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0x54 "T" Print char
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0x55 "U" Print char
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0x56 "V" Print char
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0x57 "W" Print char
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0x58 "X" Print char
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0x59 "Y" Print char
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0x5A "Z" Print char
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0x5B "[" left/opening bracket Print char
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0x5C "\" back slash Print char
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0x5D "]" right/closing bracket Print char
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0x5E "^" caret/circumflex Print char
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0x5F "_" underscore Print char
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0x60 "`" Print char
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0x61 "a" Print char
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0x62 "b" Print char
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0x63 "c" Print char
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0x64 "d" Print char
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0x65 "e" Print char
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0x66 "f" Print char
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0x67 "g" Print char
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0x68 "h" Print char
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0x69 "i" Print char
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0x6A "j" Print char
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0x6B "k" Print char
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0x6C "l" Print char
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0x6D "m" Print char
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0x6E "n" Print char
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0x6F "o" Print char
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0x70 "p" Print char
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0x71 "q" Print char
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0x72 "r" Print char
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0x73 "s" Print char
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0x74 "t" Print char
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0x75 "u" Print char
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0x76 "v" Print char
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0x77 "w" Print char
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0x78 "x" Print char
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0x79 "y" Print char
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0x7A "z" Print char
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0x7B "{" left/opening brace Print char
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0x7C "|" vertical bar Print char
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0x7D "}" right/closing brace Print char
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0x7E "~" tilde Print char
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0x7F "del" arrow to the left Print char
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