Components/IP/HEB LCD
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HEB-LCD IP Core
This IP can be found on the EDA Repository: svn: https://repos.hevs.ch/svn/eda/
The Lcd and Lcd_test library is intended to use with the HEB_LCD_V2_0
The HEB_LCD_V2_0 features a EADOGM132-5 LCD. Its a 4 Line and 132 column blacklight display. The font created for it uses 6 columns per character which allows to have 4 lines with 22 characters each.
The connection is I2C based and some initial configuration needs to be done. The bloc lcdController has everything needed to use the LCD. See the toplevel bloc overview below.
Design
lcdController
Main bloc containing all needed subblocs
lcdCharacterEncoder
This bloc receives the ASCII data to display and converts it to display data or display commands
bramMemory
Contains the command for command chars (<0x20) and the display (pixel) data for a the symbol chars (>=0x20). All the data of this ram are stored inthe font.txt file.
lcdInitialiser
This bloc lets send predefined commands for 2 features. One is for initialising the display in the beginning, and the other is for clear all data from the display
lcdSerialiser
This bloc takes the parallised data and sends them over the I2C bus.
Generics
The controller has 2 generics:
- aciiBitNb, which should be set to 7
- baudRateDivide, which gives the SPI clock rate as a function of the system clock
The display's maximal SPI rate is 20 MHz.
Synthesis
Using BRAMs, one needs to add in Synthesize -> Process properties -> Other XST command-line options :
-use_new_parser yes
Supported Characters
In VHDL the characters can be written with the following command:
character'pos(VHDL value)
where VHDL is inidicated in the table below.
| Hex | VHDL Value | Description | Function |
|---|---|---|---|
| 0x00 | nul | Null | Not supported |
| 0x01 | soh | Start of Header | Not supported |
| 0x02 | stx | Start of Text | (0,0) Goto pos line 0 character 0 |
| 0x03 | etx | End of Text | (3,21) Goto pos line 3 character 21 |
| 0x04 | eot | End of Transmission | Not supported |
| 0x05 | enq | Enquiry | Not supported |
| 0x06 | ack | Acknowledgment | Not supported |
| 0x07 | bel | Bell | Not supported |
| 0x08 | bs | Backspace | (y,x-1) Jump one char back |
| 0x09 | ht | Horizontal Tab | Not supported |
| 0x0A | lf | Line Feed | (y+1,x)Goto next line |
| 0x0B | vt | Vertical Tab | (y-1,x) Goto previous line |
| 0x0C | ff | Form Feed | Not supported |
| 0x0D | cr | Carriage Return | (y,0) Goto beginning of line |
| 0x0E | so | Shift Out | Not supported |
| 0x0F | si | Shift In | Not supported |
| 0x10 | dle | Data Link Escape | Not supported |
| 0x11 | dc1 | XON Device Control 1 | Not supported |
| 0x12 | dc2 | Device Control 2 | Not supported |
| 0x13 | dc3 | XOFFDevice Control 3 | Not supported |
| 0x14 | dc4 | Device Control 4 | Not supported |
| 0x15 | nak | Negativ Acknowledgemnt | Not supported |
| 0x16 | syn | Synchronous Idle | Not supported |
| 0x17 | etb | End of Trans. Block | Not supported |
| 0x18 | can | Cancel | Clear entire display |
| 0x19 | em | End of Medium | Not supported |
| 0x1A | sub | Substitute | Not supported |
| 0x1B | esc | Escape | Not supported |
| 0x1C | fsp | File Separator | Not supported |
| 0x1D | gsp | Group Separator | Not supported |
| 0x1E | rsp | Reqst to SendRec. Sep. | Not supported |
| 0x1F | usp | Unit Separator | Not supported |
| 0x20 | ' ' | Space | Print char |
| 0x21 | '!' | exclamation mark | Print char |
| 0x22 | '"' | double quote | Print char |
| 0x23 | '#' | number sign | Print char |
| 0x24 | "$" | dollar sign | Print char |
| 0x25 | "%" | percent | Print char |
| 0x26 | "&" | ampersand | Print char |
| 0x27 | "'" | single quote | Print char |
| 0x28 | "(" | left/open parenthesis | Print char |
| 0x29 | ")" | right/closing parenth. | Print char |
| 0x2A | "*" | asterisk | Print char |
| 0x2B | "+" | plus | Print char |
| 0x2C | "," | comma | Print char |
| 0x2D | "-" | minus or dash | Print char |
| 0x2E | "." | dot | Print char |
| 0x2F | "/" | forward slash | Print char |
| 0x30 | "0" | Print char | |
| 0x31 | "1" | Print char | |
| 0x32 | "2" | Print char | |
| 0x33 | "3" | Print char | |
| 0x34 | "4" | Print char | |
| 0x35 | "5" | Print char | |
| 0x36 | "6" | Print char | |
| 0x37 | "7" | Print char | |
| 0x38 | "8" | Print char | |
| 0x39 | "9" | Print char | |
| 0x3A | ":" | colon | Print char |
| 0x3B | ";" | semi-colon | Print char |
| 0x3C | "<" | less than | Print char |
| 0x3D | "=" | equal sign | Print char |
| 0x3E | ">" | greater than | Print char |
| 0x3F | "?" | question mark | Print char |
| 0x40 | "@" | AT symbol | Print char |
| 0x41 | "A" | Print char | |
| 0x42 | "B" | Print char | |
| 0x43 | "C" | Print char | |
| 0x44 | "D" | Print char | |
| 0x45 | "E" | Print char | |
| 0x46 | "F" | Print char | |
| 0x47 | "G" | Print char | |
| 0x48 | "H" | Print char | |
| 0x49 | "I" | Print char | |
| 0x4A | "J" | Print char | |
| 0x4B | "K" | Print char | |
| 0x4C | "L" | Print char | |
| 0x4D | "M" | Print char | |
| 0x4E | "N" | Print char | |
| 0x4F | "O" | Print char | |
| 0x50 | "P" | Print char | |
| 0x51 | "Q" | Print char | |
| 0x52 | "R" | Print char | |
| 0x53 | "S" | Print char | |
| 0x54 | "T" | Print char | |
| 0x55 | "U" | Print char | |
| 0x56 | "V" | Print char | |
| 0x57 | "W" | Print char | |
| 0x58 | "X" | Print char | |
| 0x59 | "Y" | Print char | |
| 0x5A | "Z" | Print char | |
| 0x5B | "[" | left/opening bracket | Print char |
| 0x5C | "\" | back slash | Print char |
| 0x5D | "]" | right/closing bracket | Print char |
| 0x5E | "^" | caret/circumflex | Print char |
| 0x5F | "_" | underscore | Print char |
| 0x60 | "`" | Print char | |
| 0x61 | "a" | Print char | |
| 0x62 | "b" | Print char | |
| 0x63 | "c" | Print char | |
| 0x64 | "d" | Print char | |
| 0x65 | "e" | Print char | |
| 0x66 | "f" | Print char | |
| 0x67 | "g" | Print char | |
| 0x68 | "h" | Print char | |
| 0x69 | "i" | Print char | |
| 0x6A | "j" | Print char | |
| 0x6B | "k" | Print char | |
| 0x6C | "l" | Print char | |
| 0x6D | "m" | Print char | |
| 0x6E | "n" | Print char | |
| 0x6F | "o" | Print char | |
| 0x70 | "p" | Print char | |
| 0x71 | "q" | Print char | |
| 0x72 | "r" | Print char | |
| 0x73 | "s" | Print char | |
| 0x74 | "t" | Print char | |
| 0x75 | "u" | Print char | |
| 0x76 | "v" | Print char | |
| 0x77 | "w" | Print char | |
| 0x78 | "x" | Print char | |
| 0x79 | "y" | Print char | |
| 0x7A | "z" | Print char | |
| 0x7B | "{" | left/opening brace | Print char |
| 0x7C | " | vertical bar | Print char |
| 0x7D | "}" | right/closing brace | Print char |
| 0x7E | "~" | tilde | Print char |
| 0x7F | "del" | arrow to the left | Print char |
