uint8_t i2cm_get_state(void);
uint8_t i2cm_get_received_byte(void);
void i2cm_register_event(void (*func)(i2cm_state state));
-uint8_t i2cm_send_byte(uint8_t byte);
uint8_t i2cm_send_start(uint8_t sla_w);
uint8_t i2cm_send_stop(void);
uint8_t i2cm_receive_byte(uint8_t last);