File content as of revision 0:7ee6afa15d51:

/**
 * PS/2 interface control class (Version 0.0.1)
 *
 * Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems)
 * http://shinta.main.jp/
 */

#ifndef _PS2_H_
#define _PS2_H_

#include "mbed.h"
#include "Semaphore.h"

/**
 * PS/2 interface control class.
 */
class PS2 {
public:
    /**
     * Create.
     *
     * @param clkinpin Input pin for clock.
     * @param datinpin Input pin for data.
     */
    PS2(PinName clkin_pin, PinName datin_pin, PinName clkout_pin = NC, PinName datout_pin = NC);

    /**
     * Destory.
     */
    ~PS2();

    /**
     * Check exists a data.
     *
     * @return true if a data exists.
     */
    bool exists(void);

    /**
     * Get a data into a buffer.
     *
     * @param buf A pointer to a buffer.
     * @param bufsiz A size of the buffer.
     *
     * @return Number of a byte size.
     */
    int getData(uint8_t *buf, size_t bufsiz);

private:
    InterruptIn clkin;
    DigitalIn datin;
    DigitalOut clkout;
    DigitalOut datout;
    Timeout timeout;
    Semaphore sem;
    int writepoint;
    int readpoint;
    static const int TIMEOUT_US = 10 * 1000;
    static const int RINGBUFSIZ = 16;
    static const int DATABUFSIZ = 32;

    typedef enum {
        Idle,
        Reading,
        Writing
    } State;

    typedef struct {
        State state;
        int bitcnt;
        int bytecnt;
        int errcnt;
        uint8_t buffer[DATABUFSIZ];
    } work_t;
    work_t work;

    typedef struct {
        int bytecnt;
        uint8_t buffer[DATABUFSIZ];
    } data_t;
    data_t ringbuffer[RINGBUFSIZ];

    void func_timeout(void);
    void func_fall(void);
    void init_work(void);
};

#endif