mcp23017.h

#ifndef MCP23017_H
#define MCP23017_H

#include <QObject>

//Control Reg.
#define MCP23017_IOCON 0x0A
//Pin direction Regs.
#define MCP23017_IODIRA 0x00
#define MCP23017_IODIRB 0x01
//Pull-up resistors Regs.
#define MCP23017_GPPUA 0x0C
#define MCP23017_GPPUB 0x0D
//Port registers
#define MCP23017_GPIOA 0x12
#define MCP23017_GPIOB 0x13
//Interrupt enable registers
#define MCP23017_GPINTENA 0x04
#define MCP23017_GPINTENB 0x05
//Interrupt default compare register
#define MCP23017_DEFVALA 0x06
#define MCP23017_DEFVALB 0x07
//Interrupt control registers
#define MCP23017_INTCONA 0x08
#define MCP23017_INTCONB 0x09
//Interrupt flag registers
#define MCP23017_INTFA 0x0E
#define MCP23017_INTFB 0x0F
//Interrupt capture registers
#define MCP23017_INTCAPA 0x10
#define MCP23017_INTCAPB 0x11

//Port defs.
#define PORTA 0
#define PORTB 1

class Mcp23017 : public QObject
{
    Q_OBJECT
public:
    explicit Mcp23017(QObject *parent = 0);

    int open(quint8 _addr);
    int setTris(quint8 port, quint8 tris);
    int writePort(quint8 port, quint8 data);
    int writePin(quint8 port, quint8 pin, quint8 data);
    int setPullup(quint8 port, quint8 pullup);
    int readPort(quint8 port);
    int readPin(quint8 port, quint8 pin);

    int setISR(quint8 port, quint8 intmask);
    virtual int ISRA();
    virtual int ISRB();

    quint8 porta;
    quint8 portb;
signals:
    void interrupt_A(quint8 value);
    void interrupt_B(quint8 value);

public slots:

private:

protected:

    int fd;

        
};

#endif // MCP23017_H