muti_mcu_function.h

本代码是AVR单片机的完整IIC通信程序

#define TWI_BUFFER_SIZE 4   // Set this to the largest message size that will be sent including address byte.

#define TWI_TWBR            0x0C        // TWI Bit rate Register setting.
                                        // Se Application note for detailed 
                                        // information on setting this value.
// Not used defines!
//#define TWI_TWPS          0x00        // This driver presumes prescaler = 00

/****************************************************************************
  Global definitions
****************************************************************************/

struct TWI_statusReg                       // Status byte holding flags.
{
    unsigned char all;
   
    unsigned char lastTransOK;      
    unsigned char unusedBits;
	//add slave status
	 unsigned int RxDataInBuf ;
     unsigned int genAddressCall ;
	
};

extern struct TWI_statusReg TWI_statusReg;

/****************************************************************************
  Function definitions
****************************************************************************/
void TWI_Master_Initialise( void );
void TWI_Slave_Initialise( 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,unsigned char status );
void TWI_Start_Transceiver(unsigned char status );
unsigned char TWI_Get_Data_From_Transceiver( unsigned char *, unsigned char,unsigned char status );
void TWI_Working_status(unsigned char status);
/****************************************************************************
  Bit and byte definitions
****************************************************************************/
#define TWI_READ_BIT  0       // Bit position for R/W bit in "address byte".
#define TWI_ADR_BITS  1       // Bit position for LSB of the slave address bits in the init byte.
#define TWI_GEN_BIT   0

#define TRUE          1
#define FALSE         0

/****************************************************************************
  TWI State codes
****************************************************************************/
// 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 =