i2c.h

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#ifndef _I2C_H
#define _I2C_H
 
#include "user_config.h"
#include <util/twi.h>
 
 
// NOTE: TW_MR_ARB_LOST == TW_MT_ARB_LOST
#define TW_ARB_LOST TW_MT_ARB_LOST
 
// 16 I2C send/receive buffered operations
#define I2C_OPS             16
// 10ms timeout per transaction
#define I2C_TIMEOUT         10
 
#define I2C_OP_TIMEOUT      _BV(0)
#define I2C_OP_LEN          _BV(1)
#define I2C_OP_ERROR        _BV(2)
#define I2C_TW_MT_SLA_NACK  _BV(3)
#define I2C_TW_MR_SLA_NACK  _BV(4)
#define I2C_TW_MT_DATA_NACK _BV(5)
#define I2C_BUS_ERROR       _BV(6)
 
typedef struct
{
    uint8_t  address;
    uint8_t  enable;
    uint8_t  done;
    uint8_t  flags;
    uint16_t timeout;
    int8_t  len;
    int8_t  ind;
    uint8_t  *buf;
} i2c_op_t;
 
typedef struct {
    uint8_t enable;
    int8_t ind;
    uint8_t done;
    uint8_t error;
} i2c_task_t;
 
typedef int8_t (*i2c_callback_t)(void);
 
extern i2c_op_t i2c;
 
extern i2c_callback_t i2c_callback;
 
extern i2c_task_t i2c_task;
 
extern i2c_op_t *i2c_task_op[I2C_OPS];
 
 
 
/* i2c.c */
uint8_t i2c_check_op ( int8_t index );
void i2c_task_init ( void );
void i2c_task_free_ops ( void );
i2c_op_t *i2c_task_op_add ( uint8_t address , uint8_t mode , uint8_t *buf , uint8_t len );
int8_t i2c_task_next_op ( void );
void i2c_task_run ( void );
void i2c_init ( uint32_t speed );
int8_t i2c_ok ( void );
int8_t i2c_done ( void );
int8_t i2c_task_done ( void );
uint8_t i2c_fn ( uint8_t address , uint8_t mode , uint8_t *buf , uint8_t len );
void i2c_send_start ( void );
void i2c_send_stop ( void );
void i2c_timer ( void );
// int ISR ( int TWI_vect );
void i2c_print_error ( i2c_op_t *o );
void i2c_display_task_errors ( void );
 
#endif