-bool i2c_start_w(uint8_t id);
-bool i2c_start_r(uint8_t id);
-void i2c_stop(void);
-bool i2c_put(const uint8_t data);
-bool i2c_send(const void *_buf, size_t count);
-int i2c_get(bool ack);
-bool i2c_recv(void *_buf, size_t count);
-void i2c_init(void);