File content as of revision 0:db8d4af513c0:

#ifndef  MCP_H_
#define  MCP_H_

#include "mbed.h"

#define SDA PB_7
#define SCL PB_6

#define MCP_ADDRESS 0x40

// MCP register address
#define IODIRA   0x00
#define IODIRB   0x01
#define IPOLA    0x02
#define IPOLB    0x03
#define GPINTENA 0x04
#define GPINTENB 0x05
#define DEFVALA  0x06
#define DEFVALB  0x07
#define INTCONA  0x08
#define INTCONB  0x09
#define IOCONA   0x0A
#define IOCONB   0x0B
#define GPPUA    0x0C
#define GPPUB    0x0D
#define INTFA    0x0E
#define INTFB    0x0F
#define INTCAPA  0x10
#define INTCAPB  0x11
#define GPIOA    0x12
#define GPIOB    0x13
#define OLATA    0x14
#define OLATB    0x15

typedef enum {
    OUTPUT,
    INPUT,
    INPUT_PULLUP,
}pin_mode;

typedef union {
    uint8_t port_A, port_B;
    uint16_t all;
}mcp_register;

class MCP {
    public:
        /* MCP class constracter
        /   deffult Input
        /                                              */
        MCP(PinName sda, PinName scl, uint8_t device_address);
        // MCP pin define * pin number is 0 ~ 15
        void PinMode(uint8_t pin, uint8_t mode);
        // MCP DigitalWrite * pin number is 0 ~ 15
        void Write(uint8_t pin, bool signal);
        // MCP DigitalRead * pin number is 0 ~ 15
        bool Read(uint8_t pin, bool signal);
        // MCP initialize
        void Initialize(void);
        // MCP register update and read new data
        void Update(void);
        // i2c error check
        bool ErrorOccurred(void);
        
    private:
        I2C i2c;
        char _read_opcode;
        char _write_opcode;
        
        uint16_t _pull_data;
        uint16_t _read_data;
        uint16_t _write_data;
        
        void _Write(uint8_t address, uint8_t data);
        void _Read(uint8_t address, uint8_t data);    
    
};

#endif //I2C_H_