PS2MS.h

00001 /**
00002  * PS/2 mouse interface control class (Version 0.0.1)
00003  *
00004  * Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems)
00005  * http://shinta.main.jp/
00006  */
00007 
00008 #ifndef _PS2MS_H_
00009 #define _PS2MS_H_
00010 
00011 #include "mbed.h"
00012 
00013 /**
00014  * PS/2 mouse interface control class.
00015  */
00016 class PS2MS {
00017 public:
00018     /**
00019      * Create.
00020      *
00021      * @param clk_pin Clock pin.
00022      * @param dat_pin Data pin.
00023      */
00024     PS2MS(PinName clk_pin, PinName dat_pin);
00025 
00026     /**
00027      * Destory.
00028      */
00029     virtual ~PS2MS();
00030 
00031     /**
00032      * Get a data from a PS/2 device.
00033      *
00034      * @return A data from a PS/2 device.
00035      */
00036     virtual int getc(void);
00037 
00038     /**
00039      * Set timeout.
00040      *
00041      * @param ms Timeout ms.
00042      */
00043     virtual void setTimeout(int ms);
00044     void init_work(void);
00045     void detatch(void);
00046     int sendCommand(char c);
00047 private:
00048     static const int RINGBUFSIZ = 2048;
00049     static const int MAX_RETRY = 1000000;
00050     static const int CLOCK_DOWN_EDGE_WAIT_MS = 1000000;
00051     volatile bool mSending;
00052     volatile bool mInFuncFall;
00053     
00054     InterruptIn clk;    /**< Interrupt input for CLK. */
00055     DigitalInOut clkOut;   /**< Digital input/output for CLK. */
00056     DigitalInOut dat;      /**< Digital input/output for DAT. */
00057     Timeout wdt;    /**< Watch dog timer. */
00058     Timer tot;      /**< Timeout timer. */
00059     int timeout;    /**< Timeout[ms] for getc(). */
00060 
00061     typedef struct {
00062         int bitcnt;
00063         int cStart;
00064         int cEnd;
00065         uint8_t buffer[RINGBUFSIZ];
00066     } work_t;
00067     work_t work;
00068 
00069     void func_timeout(void);
00070     void func_fall(void);
00071     bool waitClockDownEdge(void);
00072     bool waitClockUpLevel(void);
00073 
00074 };
00075 
00076 #endif