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00023 #ifndef INCLUDED_I2C_BITBANG_H
00024 #define INCLUDED_I2C_BITBANG_H
00025 
00026 #include <i2c.h>
00027 #include <i2c_bbio.h>
00028 
00032 class i2c_bitbang : public i2c {
00033   friend i2c_sptr make_i2c_bitbang (i2c_bbio_sptr io);
00034   i2c_bitbang (i2c_bbio_sptr io);
00035 
00036  public:
00037   ~i2c_bitbang () {}
00038   
00040   bool write (int addr, const unsigned char *buf, int nbytes);
00041 
00043   int read (int addr, unsigned char *buf, int max_bytes);
00044 
00045 
00046 private:
00047   void start ();
00048   void stop ();
00049   void write_bit (bool bit);
00050   bool write_byte (char byte);
00051   
00052   void set_sda (bool bit) { d_io->set_sda (bit); }
00053   void set_scl (bool bit) { d_io->set_scl (bit); }
00054   bool get_sda () { return d_io->get_sda (); }
00055 
00056   i2c_bbio_sptr         d_io;
00057 };
00058 
00059 i2c_sptr make_i2c_bitbang (i2c_bbio_sptr io);
00060 
00061 #endif 
00062 
00063