#ifndef I2C_ISR_H
#define I2C_ISR_H

#include <oulib.h>
#include <buffer.h>

/** States for the I2C ISR.  */
#define I2C_MASTER_STATE_ERROR -2
#define I2C_MASTER_STATE_DONE  -1
#define I2C_MASTER_STATE_WSTART 0
#define I2C_MASTER_STATE_WADDRESS_READ 1
#define I2C_MASTER_STATE_WADDRESS_WRITE 4
#define I2C_MASTER_STATE_WDATA 3
#define I2C_MASTER_STATE_W_SDATA 5

/** Data structure for communication between ISR and main program.  */
struct i2c_master_struct
{
  /** Finite state machine state.  */
  volatile int8_t state;
  /** Number of bytes to receive.  */
  volatile uint8_t size_in;
  /** Number of bytes to send.  */
  volatile uint8_t size_out;
  /** Address of slave device.  */
  volatile uint8_t address;
  /** Number of bytes sent so far. */
  uint8_t counter;
  /** Copy of the I2C status register.  */
  volatile uint8_t status;
};

// Defined by i2c_isr.c
extern BUFFER* i2c_buffer_out;
extern BUFFER* i2c_buffer_in;
extern struct i2c_master_struct master;

extern void i2c_master_init(uint8_t size_in, uint8_t size_out);
extern void i2c_wait_for_completion(void);
extern uint8_t i2c_initiate_transmit_receive(uint8_t address,
					     uint8_t size_out,
					     uint8_t size_in);


#endif