5 void i2c_write(unsigned char addr, unsigned char subaddr, unsigned char *data, int ndata);
6 void i2c_read(unsigned char addr, unsigned char subaddr, unsigned char *buf, int size);
8 void i2c_async(void (*donecb)(void));
9 void i2c_check_async(void);
11 void i2c_release(void);
12 unsigned char i2c_isheld(void);