#ifndef __TWI_H__
#define __TWI_H__

#define TWI_BUFFER_SIZE 4

union TWI_statusReg_t
{
    uint8_t all;
    struct
    {
        uint8_t lastTransOK : 1;
        uint8_t RxDataInBuf : 1;
        uint8_t genAddressCall : 1;
        uint8_t unusedBits : 5;
    };
};

extern union TWI_statusReg_t TWI_statusReg;

void TWI_Slave_Initialize(unsigned char);
unsigned char TWI_Transceiver_Busy(void);
unsigned char TWI_Get_State_Info(void);
void TWI_Start_Transceiver_With_Data(unsigned char *, unsigned char);
void TWI_Start_Transceiver(void);
unsigned char TWI_Get_Data_From_Transceiver(unsigned char *, unsigned char);


#define TWI_READ_BIT 0
#define TWI_ADR_BITS 1
#define TWI_GEN_BIT  0

#define TRUE 1
#define FALSE 0

// General TWI Master staus codes
#define TWI_START 0x08 // START has been transmitted
#define TWI_REP_START 0x10 // Repeated START has been transmitted
#define TWI_ARB_LOST 0x38 // Arbitration lost

// TWI Master Transmitter staus codes
#define TWI_MTX_ADR_ACK 0x18 // SLA+W has been tramsmitted and ACK received
#define TWI_MTX_ADR_NACK 0x20 // SLA+W has been tramsmitted and NACK received
#define TWI_MTX_DATA_ACK 0x28 // Data byte has been tramsmitted and ACK received
#define TWI_MTX_DATA_NACK 0x30 // Data byte has been tramsmitted and NACK received

// TWI Master Receiver staus codes
#define TWI_MRX_ADR_ACK 0x40 // SLA+R has been tramsmitted and ACK received
#define TWI_MRX_ADR_NACK 0x48 // SLA+R has been tramsmitted and NACK received
#define TWI_MRX_DATA_ACK 0x50 // Data byte has been received and ACK tramsmitted
#define TWI_MRX_DATA_NACK 0x58 // Data byte has been received and NACK tramsmitted

// TWI Slave Transmitter staus codes
#define TWI_STX_ADR_ACK 0xA8 // Own SLA+R has been received; ACK has been returned
#define TWI_STX_ADR_ACK_M_ARB_LOST 0xB0 // Arbitration lost in SLA+R/W as Master; own SLA+R has been received; ACK has been returned
#define TWI_STX_DATA_ACK 0xB8 // Data byte in TWDR has been transmitted; ACK has been received
#define TWI_STX_DATA_NACK 0xC0 // Data byte in TWDR has been transmitted; NOT ACK has been received
#define TWI_STX_DATA_ACK_LAST_BYTE 0xC8 // Last data byte in TWDR has been transmitted (TWEA = “0”); ACK has been received

// TWI Slave Receiver staus codes
#define TWI_SRX_ADR_ACK 0x60 // Own SLA+W has been received ACK has been returned
#define TWI_SRX_ADR_ACK_M_ARB_LOST 0x68 // Arbitration lost in SLA+R/W as Master; own SLA+W has been received; ACK has been returned
#define TWI_SRX_GEN_ACK 0x70 // General call address has been received; ACK has been returned
#define TWI_SRX_GEN_ACK_M_ARB_LOST 0x78 // Arbitration lost in SLA+R/W as Master; General call address has been received; ACK has been returned
#define TWI_SRX_ADR_DATA_ACK 0x80 // Previously addressed with own SLA+W; data has been received; ACK has been returned
#define TWI_SRX_ADR_DATA_NACK 0x88 // Previously addressed with own SLA+W; data has been received; NOT ACK has been returned
#define TWI_SRX_GEN_DATA_ACK 0x90 // Previously addressed with general call; data has been received; ACK has been returned
#define TWI_SRX_GEN_DATA_NACK 0x98 // Previously addressed with general call; data has been received; NOT ACK has been returned
#define TWI_SRX_STOP_RESTART 0xA0 // A STOP condition or repeated START condition has been received while still addressed as Slave

// TWI Miscellaneous status codes
#define TWI_NO_STATE 0xF8 // No relevant state information available; TWINT = “0”
#define TWI_BUS_ERROR 0x00 // Bus error due to an illegal START or STOP condition

#endif