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Diffstat (limited to 'src/electronics/port.h')
| -rw-r--r-- | src/electronics/port.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/src/electronics/port.h b/src/electronics/port.h new file mode 100644 index 0000000..53182bc --- /dev/null +++ b/src/electronics/port.h @@ -0,0 +1,248 @@ +/*************************************************************************** + * Copyright (C) 2005 by David Saxton * + * [email protected] * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + ***************************************************************************/ + +#ifndef PORT_H +#define PORT_H + +#include <qstringlist.h> + +#include <termios.h> + +/** +@author David Saxton + */ +class Port +{ + public: + enum ProbeResult + { + ExistsAndRW = 1 << 0, + ExistsButNotRW = 1 << 1, + DoesntExist = 1 << 2 + }; + + Port(); + virtual ~Port(); + + /** + * Returns a list of ports, whose probe status AND's with probeResult. + * This function just returns the combination of the lists for + * SerialPort::ports and ParallelPort::ports. + */ + static QStringList ports( unsigned probeResult ); +}; + + +/** +Abstraction for a serial port, allowing control over individual pins. + +@author David Saxton + */ +class SerialPort : public Port +{ + public: + enum Pin + { + CD = 1, // Carrier detect + RD = 2, // Recieved data + TD = 3, // Transmitted data + DTR = 4, // Data terminal ready + GND = 5, // Signal ground + DSR = 6, // Data set ready + RTS = 7, // Request to send + CTS = 8, // Clear to send + RI = 9, // Ring indicator + }; + + SerialPort(); + ~SerialPort(); + + /** + * Writes state (high or low) to the given pin. + */ + void setPinState( Pin pin, bool state ); + bool pinState( Pin pin ); + + static ProbeResult probe( const QString & port ); + /** + * @see Port::ports + */ + static QStringList ports( unsigned probeResult ); + /** + * Opens the given port. + * @return if the port could be opened. + * @param baudRate The baud rate as defined in bits/termios.h + */ + bool openPort( const QString & port, speed_t baudRate ); + /** + * Closes any currently open port. + */ + void closePort(); + + protected: + /// Read in on port open; restored on port close + termios m_previousState; + + /// File descriptor for the port. + int m_file; +}; + + +/** +Abstraction for a parallel port, allowing control over individual pins. +Based loosely on code in the parapin project; see http://parapin.sf.net + +@author David Saxton +*/ +class ParallelPort : public Port +{ + public: + enum Pin + { + // Data Register + // Offset: Base + 0 + // Readable / writable + PIN02 = 1 << 0, // Data 0 + PIN03 = 1 << 1, // Data 1 + PIN04 = 1 << 2, // Data 2 + PIN05 = 1 << 3, // Data 3 + PIN06 = 1 << 4, // Data 4 + PIN07 = 1 << 5, // Data 5 + PIN08 = 1 << 6, // Data 6 + PIN09 = 1 << 7, // Data 7 + DATA_PINS = PIN02 | PIN03 | PIN04 | PIN05 | PIN06 + | PIN07 | PIN08 | PIN09, + + // Status Register + // Offset: Base + 1 + // Read only + PIN15 = 1 << 11, // Error + PIN13 = 1 << 12, // Online + PIN12 = 1 << 13, // Paper End + PIN10 = 1 << 14, // Ack + PIN11 = 1 << 15, // Busy + STATUS_PINS = PIN15 | PIN13 | PIN12 | PIN10 | PIN11, + + // Control Register + // Offset: Base + 2 + // Readable / writable + PIN01 = 1 << 16, // Strobe + PIN14 = 1 << 17, // Auto Feed + PIN16 = 1 << 18, // Init + PIN17 = 1 << 19, // Select + CONTROL_PINS = PIN01 | PIN14 | PIN16 | PIN17, + + + // Pins 18 to 25 are ground + }; + + enum Register + { + Data = 0, + Status = 1, + Control = 2, + }; + + /** + * For setting the direction of the Data register or the Control pins. + */ + enum Direction + { + Input = 0, + Output = 1, + }; + + ParallelPort(); + ~ParallelPort(); + + /** + * Opens the given port. + * @return if the port could be opened. + */ + bool openPort( const QString & port ); + /** + * Closes any currently open port. + */ + void closePort(); + + //BEGIN Pin-oriented operations + /** + * @param pins A list of ParallelPort::Pin OR'd together. + */ + void setPinState( int pins, bool state ); + /** + * @return the pin states for the given list of pins. + */ + int pinState( int pins ); + /** + * Sets the given pins to the given state in the Data register. + */ + void setDataState( uchar pins, bool state ); + /** + * Sets the given pins to the given state in the Control register. + */ + void setControlState( uchar pins, bool state ); + //END Pin-oriented operations + + + //BEGIN Register-oriented operations + /** + * Reads and stores the value in the given reigsters, and returns it. + */ + uchar readFromRegister( Register reg ); + /** + * Write the given value to the Data register. + */ + void writeToData( uchar value ); + /** + * Write the given value to the Control register (any input pins will be + * set to one). + */ + void writeToControl( uchar value ); + //END Register-oriented operations + + + //BEGIN Changing pin directions + /** + * Sets the (input / ouput) direction of the data pins. + */ + void setDataDirection( Direction dir ); + /** + * Sets the given pins to the given direction. + */ + void setControlDirection( int pins, Direction dir ); + //END Changing pin directions + + static ProbeResult probe( const QString & port ); + /** + * @see Port::ports + */ + static QStringList ports( unsigned probeResult ); + + protected: + /** + * Writes the value to the given register. + */ + void writeToRegister( Register reg, uchar value ); + void reset(); + + uchar m_reg[3]; + + /// Mask of the pins that are currently set as input + int m_inputPins; + + /// Mask of the pins that are currently set as output + int m_outputPins; + + /// File descriptor for the port. + int m_file; +}; + +#endif |