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/* mbed I2CTextLCD Library
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* Copyright (c) 2007-2009 sford
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* Copyright (c) 2010 Wim De Roeve changed to work with I2C PCF8575
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* Released under the MIT License: http://mbed.org/license/mit
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*/
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#ifndef MBED_I2CTextLCD_H
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#define MBED_I2CTextLCD_H
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#include "mbed.h"
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#include "Stream.h"
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/* The code assumes the following connections between the PCF8575
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* and the LCD
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*
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* nc - D0
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* nc - D1
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* nc - D2
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* nc - D3
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* P0 - D4
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* P1 - D5
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* P2 - D6
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* P3 - D7
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* P4 - E
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* P5 - nc
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* P6 - nc
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* P7 - RS
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* gnd - R/W
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*/
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#define E_ON 0x10 //P4
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#define RS_ON 0x80 //P7
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namespace mbed {
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/* Class: I2CTextLCD
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* A 16x2 Text LCD controller
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*
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* Allows you to print to a Text LCD screen, and locate/cls. Could be
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* turned in to a more generic libray.
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*
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* If you are connecting multiple displays, you can connect them all in
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* parallel except for the enable (e) pin, which must be unique for each
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* display.
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*
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* Example:
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* > #include "mbed.h"
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* > #include "I2CTextLCD.h"
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* >
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* > I2CTextLCD lcd(p9, P10, 0x40); // sda scl, address
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* >
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* > int main() {
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* > lcd.printf("Hello World!");
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* > }
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*/
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class I2CTextLCD : public Stream {
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public:
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/* Constructor: I2CTextLCD
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* Create a I2CTextLCD object, connected to the specified pins
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*
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* All signals must be connected to DigitalIn compatible pins.
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*
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* Variables:
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* rs - Used to specify data or command
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* rw - Used to determine read or write
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* e - enable
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* d0..d3 - The data lines
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*/
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I2CTextLCD(PinName sda, PinName scl, int address, int columns = 16, int rows = 2);
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#if 0 // Inhereted from Stream, for documentation only
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/* Function: putc
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* Write a character
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*
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* Variables:
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* c - The character to write to the serial port
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*/
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int putc(int c);
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/* Function: printf
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* Write a formated string
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*
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* Variables:
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* format - A printf-style format string, followed by the
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* variables to use in formating the string.
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*/
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int printf(const char* format, ...);
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#endif
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/* Function: locate
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* Locate to a certian position
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*
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* Variables:
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* column - the column to locate to, from 0..15
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* row - the row to locate to, from 0..1
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*/
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virtual void locate(int column, int row);
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/* Function: cls
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* Clear the screen, and locate to 0,0
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*/
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virtual void cls();
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virtual void reset();
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protected:
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void clock();
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void writeData(int data);
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void writeCommand(int command);
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void writeByte(int value, bool rs);
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void writeNibble(int value, bool rs);
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void writeI2CByte(int data);
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virtual int _putc(int c);
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virtual int _getc();
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virtual void newline();
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int _row;
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int _column;
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int _columns;
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int _rows;
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I2C _i2c;
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int _i2cAddress;
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private:
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};
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}
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#endif
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Wim De Roeve