File content as of revision 1:ba28114bd6bb:

#ifndef OFN_H
#define OFN_H

#include "mbed.h"

#define DEVICE_ADDR 0x33
#define PRODUCT_ID_ADDR 0x00
#define REVISION_ID_ADDR 0x01

#define SOFT_RESET 0x3A
#define OFN_ORIENTATION_CTRL 0x77

#define ORIENT_DEFAULT 1
#define ORIENT_ROTATED_CLKWISE 0

class OFN {
    
    public: 
    
    /**
     * Constructor.
     *
     * @param sda mbed pin to use for SDA line of I2C interface.
     * @param scl mbed pin to use for SCL line of I2C interface.
     */
    OFN(PinName sda, PinName scl);
    
    /**
     * 
     * Function to check if motion has been detected
     * Checks the 7th bit of MOTION register and 
     * Returns true if motion detected else returns false
     */
    bool checkMotion();

    /**
     * 
     * Function to get displacement in the X direction
     * Returns an integer value
     */    
    int readX();     
    
    /**
     * 
     * Function to get displacement in the X direction
     * Returns an integer value
     */    
    int readY();       
    
    /**
     * 
     * Function to read the Orientation register
     * Returns an integer value
     *  1 - default orientation
     *  0 - rotated by 90 degrees
     */    
    int readOrientation();
    
    private:
    
    I2C i2c;
    
    char MOTREG_ADDR;       // To contain address of Motion Register
    char DELTA_X_ADDR;      // To contain address of Delta_X Register
    char DELTA_Y_ADDR;      // To contain address of Delta_Y Register
    int MotReg;             // To contain value of Motion Register
    bool moved;             // To contain value of state of Motion
        
    char raw_delta_X[1];    // To contain raw sensor reading of Delta_X
    int delta_X;            // To contain correct reading of Delta_X
    
    char raw_delta_Y[1];    // To contain raw sensor reading of Delta_Y
    int delta_Y;            // To contain correct reading of Delta_Y
};

#endif  /* OFN_H */