Yoshi Mimura
This is a modified version of TextLCD on the Cookbook for 20X4 LCD specific. This does not control RW line, so we can reduce the number of pin usage on the mbed.
TextLCD_20X4.h@0:f84245f91a5a, 2010-05-14 (annotated)
- Committer:
- ym1784
- Date:
- Fri May 14 21:19:39 2010 +0000
- Revision:
- 0:f84245f91a5a
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| ym1784 | 0:f84245f91a5a | 1 | /* mbed TextLCD Library |
| ym1784 | 0:f84245f91a5a | 2 | * Copyright (c) 2007-2009 sford |
| ym1784 | 0:f84245f91a5a | 3 | * Released under the MIT License: http://mbed.org/license/mit |
| ym1784 | 0:f84245f91a5a | 4 | * |
| ym1784 | 0:f84245f91a5a | 5 | * TODO: Needs serious rework/neatening up! |
| ym1784 | 0:f84245f91a5a | 6 | */ |
| ym1784 | 0:f84245f91a5a | 7 | |
| ym1784 | 0:f84245f91a5a | 8 | /* |
| ym1784 | 0:f84245f91a5a | 9 | * 2010/05/14 modified for 20X4 LCD by ym1784 |
| ym1784 | 0:f84245f91a5a | 10 | */ |
| ym1784 | 0:f84245f91a5a | 11 | |
| ym1784 | 0:f84245f91a5a | 12 | #ifndef MBED_TEXTLCD_20X4_H |
| ym1784 | 0:f84245f91a5a | 13 | #define MBED_TEXTLCD_20X4_H |
| ym1784 | 0:f84245f91a5a | 14 | |
| ym1784 | 0:f84245f91a5a | 15 | #include "Stream.h" |
| ym1784 | 0:f84245f91a5a | 16 | #include "DigitalOut.h" |
| ym1784 | 0:f84245f91a5a | 17 | #include "BusOut.h" |
| ym1784 | 0:f84245f91a5a | 18 | |
| ym1784 | 0:f84245f91a5a | 19 | namespace mbed { |
| ym1784 | 0:f84245f91a5a | 20 | |
| ym1784 | 0:f84245f91a5a | 21 | /* Class: TextLCD_20X4 |
| ym1784 | 0:f84245f91a5a | 22 | * A 20x4 Text LCD controller ... ym1784 |
| ym1784 | 0:f84245f91a5a | 23 | * |
| ym1784 | 0:f84245f91a5a | 24 | * Allows you to print to a Text LCD screen, and locate/cls. Could be |
| ym1784 | 0:f84245f91a5a | 25 | * turned in to a more generic libray. |
| ym1784 | 0:f84245f91a5a | 26 | * |
| ym1784 | 0:f84245f91a5a | 27 | * If you are connecting multiple displays, you can connect them all in |
| ym1784 | 0:f84245f91a5a | 28 | * parallel except for the enable (e) pin, which must be unique for each |
| ym1784 | 0:f84245f91a5a | 29 | * display. |
| ym1784 | 0:f84245f91a5a | 30 | * |
| ym1784 | 0:f84245f91a5a | 31 | * Example: |
| ym1784 | 0:f84245f91a5a | 32 | * > #include "mbed.h" |
| ym1784 | 0:f84245f91a5a | 33 | * > #include "TextLCD_20X4.h" |
| ym1784 | 0:f84245f91a5a | 34 | * > |
| ym1784 | 0:f84245f91a5a | 35 | * > TextLCD_20X4 lcd(p21, p22, p23, p24, p25, p26); // rs, e, d0, d1, d2, d3 |
| ym1784 | 0:f84245f91a5a | 36 | * > |
| ym1784 | 0:f84245f91a5a | 37 | * > int main() { |
| ym1784 | 0:f84245f91a5a | 38 | * > lcd.printf("Hello World!"); |
| ym1784 | 0:f84245f91a5a | 39 | * > } |
| ym1784 | 0:f84245f91a5a | 40 | */ |
| ym1784 | 0:f84245f91a5a | 41 | class TextLCD_20X4 : public Stream { |
| ym1784 | 0:f84245f91a5a | 42 | |
| ym1784 | 0:f84245f91a5a | 43 | public: |
| ym1784 | 0:f84245f91a5a | 44 | /* Constructor: TextLCD_20X4 |
| ym1784 | 0:f84245f91a5a | 45 | * Create a TextLCD_20X4 object, connected to the specified pins |
| ym1784 | 0:f84245f91a5a | 46 | * |
| ym1784 | 0:f84245f91a5a | 47 | * All signals must be connected to DigitalIn compatible pins. |
| ym1784 | 0:f84245f91a5a | 48 | * |
| ym1784 | 0:f84245f91a5a | 49 | * Variables: |
| ym1784 | 0:f84245f91a5a | 50 | * rs - Used to specify data or command |
| ym1784 | 0:f84245f91a5a | 51 | * e - enable |
| ym1784 | 0:f84245f91a5a | 52 | * d0..d3 - The data lines |
| ym1784 | 0:f84245f91a5a | 53 | */ |
| ym1784 | 0:f84245f91a5a | 54 | TextLCD_20X4(PinName rs, PinName e, PinName d0, PinName d1, |
| ym1784 | 0:f84245f91a5a | 55 | PinName d2, PinName d3, int columns = 20, int rows = 4); |
| ym1784 | 0:f84245f91a5a | 56 | |
| ym1784 | 0:f84245f91a5a | 57 | #if 0 // Inhereted from Stream, for documentation only |
| ym1784 | 0:f84245f91a5a | 58 | /* Function: putc |
| ym1784 | 0:f84245f91a5a | 59 | * Write a character |
| ym1784 | 0:f84245f91a5a | 60 | * |
| ym1784 | 0:f84245f91a5a | 61 | * Variables: |
| ym1784 | 0:f84245f91a5a | 62 | * c - The character to write to the serial port |
| ym1784 | 0:f84245f91a5a | 63 | */ |
| ym1784 | 0:f84245f91a5a | 64 | int putc(int c); |
| ym1784 | 0:f84245f91a5a | 65 | |
| ym1784 | 0:f84245f91a5a | 66 | /* Function: printf |
| ym1784 | 0:f84245f91a5a | 67 | * Write a formated string |
| ym1784 | 0:f84245f91a5a | 68 | * |
| ym1784 | 0:f84245f91a5a | 69 | * Variables: |
| ym1784 | 0:f84245f91a5a | 70 | * format - A printf-style format string, followed by the |
| ym1784 | 0:f84245f91a5a | 71 | * variables to use in formating the string. |
| ym1784 | 0:f84245f91a5a | 72 | */ |
| ym1784 | 0:f84245f91a5a | 73 | int printf(const char* format, ...); |
| ym1784 | 0:f84245f91a5a | 74 | #endif |
| ym1784 | 0:f84245f91a5a | 75 | |
| ym1784 | 0:f84245f91a5a | 76 | /* Function: locate |
| ym1784 | 0:f84245f91a5a | 77 | * Locate to a certian position |
| ym1784 | 0:f84245f91a5a | 78 | * |
| ym1784 | 0:f84245f91a5a | 79 | * Variables: |
| ym1784 | 0:f84245f91a5a | 80 | * column - the column to locate to, from 0..19 |
| ym1784 | 0:f84245f91a5a | 81 | * row - the row to locate to, from 0..3 |
| ym1784 | 0:f84245f91a5a | 82 | */ |
| ym1784 | 0:f84245f91a5a | 83 | virtual void locate(int column, int row); |
| ym1784 | 0:f84245f91a5a | 84 | |
| ym1784 | 0:f84245f91a5a | 85 | /* Function: cls |
| ym1784 | 0:f84245f91a5a | 86 | * Clear the screen |
| ym1784 | 0:f84245f91a5a | 87 | */ |
| ym1784 | 0:f84245f91a5a | 88 | virtual void cls(); |
| ym1784 | 0:f84245f91a5a | 89 | |
| ym1784 | 0:f84245f91a5a | 90 | virtual void reset(); |
| ym1784 | 0:f84245f91a5a | 91 | |
| ym1784 | 0:f84245f91a5a | 92 | //protected: |
| ym1784 | 0:f84245f91a5a | 93 | |
| ym1784 | 0:f84245f91a5a | 94 | void clock(); |
| ym1784 | 0:f84245f91a5a | 95 | void writeData(int data); |
| ym1784 | 0:f84245f91a5a | 96 | void writeCommand(int command); |
| ym1784 | 0:f84245f91a5a | 97 | void writeByte(int value); |
| ym1784 | 0:f84245f91a5a | 98 | void writeNibble(int value); |
| ym1784 | 0:f84245f91a5a | 99 | virtual int _putc(int c); |
| ym1784 | 0:f84245f91a5a | 100 | virtual int _getc(); |
| ym1784 | 0:f84245f91a5a | 101 | virtual void newline(); |
| ym1784 | 0:f84245f91a5a | 102 | |
| ym1784 | 0:f84245f91a5a | 103 | int _row; |
| ym1784 | 0:f84245f91a5a | 104 | int _column; |
| ym1784 | 0:f84245f91a5a | 105 | DigitalOut _rs, _e; |
| ym1784 | 0:f84245f91a5a | 106 | BusOut _d; |
| ym1784 | 0:f84245f91a5a | 107 | int _columns; |
| ym1784 | 0:f84245f91a5a | 108 | int _rows; |
| ym1784 | 0:f84245f91a5a | 109 | int address; |
| ym1784 | 0:f84245f91a5a | 110 | }; |
| ym1784 | 0:f84245f91a5a | 111 | |
| ym1784 | 0:f84245f91a5a | 112 | } |
| ym1784 | 0:f84245f91a5a | 113 | |
| ym1784 | 0:f84245f91a5a | 114 | #endif |