85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
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/*
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* Author: Josh Holtrop
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* Date: 2009-05-03
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*
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* This module provides a C++ object-oriented interface to a
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* Noritake itron Vacuum Fluorescent Display model CU20025ECPB-W1J
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* that my friend Mike Zwagerman let me borrow.
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*
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* It is connected to my PC's parallel port as follows:
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* CN1 Pin Parallel Port Pin
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* Gnd 1 18 Ground
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* RS 4 2 Data0
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* R/|W| 5 3 Data1
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* E 6 4 Data2
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* DB4 11 5 Data3
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* DB5 12 6 Data4
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* DB6 13 7 Data5
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* DB7 14 8 Data6
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*
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* Additionally, CN1 pin 1 (ground) is connected to an independent 5 volt
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* power supply's ground, and CN1 pin 2 (Vcc) is connected to the
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* independent power supply's +5V line.
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*
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*/
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#ifndef VFD_H
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#define VFD_H VFD_H
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#include <string>
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class VFD
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{
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public:
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static const unsigned char SHIFT_CURSOR = 0;
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static const unsigned char SHIFT_DISPLAY = 1;
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static const unsigned char LEFT = 0;
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static const unsigned char RIGHT = 1;
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static const unsigned char OFF = 0;
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static const unsigned char ON = 1;
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static const unsigned char ADDRESS_LINE1 = 0x00;
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static const unsigned char ADDRESS_LINE2 = 0x40;
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VFD();
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~VFD();
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bool connect(const std::string & parport = "/dev/parport0");
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void disconnect();
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void displayClear();
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void cursorHome();
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void entryModeSet(unsigned char address_direction, /* LEFT|RIGHT */
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unsigned char display_shift); /* ON|OFF */
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void setDisplay(unsigned char display, /* ON|OFF */
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unsigned char cursor, /* ON|OFF */
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unsigned char cursor_blink); /* ON|OFF */
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void shift(unsigned char shift_display, /* ON|OFF */
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unsigned char direction); /* LEFT|RIGHT */
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void setCGAddress(unsigned char address);
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void setAddress(unsigned char address);
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void writeByte(unsigned char data);
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void write(const std::string & str);
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protected:
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static const unsigned char RW_WRITE = 0;
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static const unsigned char RW_READ = 1;
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static const unsigned char E_DISABLE = 0;
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static const unsigned char E_ENABLE = 1;
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static const unsigned char RS_COMMAND = 0;
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static const unsigned char RS_DATA = 1;
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static const unsigned char PP_OFFSET_RS = 0;
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static const unsigned char PP_OFFSET_RW = 1;
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static const unsigned char PP_OFFSET_E = 2;
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static const unsigned char PP_OFFSET_DATA = 3;
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static const int INIT_DELAY = 10 * 1000;
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static const int DISPLAY_CLEAR_DELAY = 2300;
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void sendByte(unsigned char rs, unsigned char dat);
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void sendNibble(unsigned char rs, unsigned char dat);
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void setPPLines(unsigned char bits);
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int m_ppfd; /* parallel port file descriptor */
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};
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#endif
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