/*------------------------------------------------------------------------------
 - Title    	: TWI.h
 - Revision 	: Ver1.00
 - Author   	: cqw
 - Date     	: 27/06/2005
--------------------------------------------------------------------------------
 - Function explain :
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 - Modify   :	
------------------------------------------------------------------------------*/
#ifndef TWI_H
#define TWI_H

/*----------------------------------宏定義------------------------------------*/
/* 主時(shí)鐘頻率(Hz)*/
#define Crystal 							7372800 							// 7.3728Mhz											
/* Master */
#define TW_START              		 		0x08 
#define TW_REP_START            			0x10 
/* Master Transmitter */
#define TW_MT_SLA_ACK          			  	0x18 
#define TW_MT_SLA_NACK            			0x20 
#define TW_MT_DATA_ACK            			0x28 
#define TW_MT_DATA_NACK          			0x30 
#define TW_MT_ARB_LOST            			0x38 
/* Master Receiver */
#define TW_MR_ARB_LOST          			0x38 
#define TW_MR_SLA_ACK            			0x40 
#define TW_MR_SLA_NACK          			0x48 
#define TW_MR_DATA_ACK          			0x50 
#define TW_MR_DATA_NACK            			0x58 

#define TW_NO_INFO               			0xF8 
#define TW_BUS_ERROR            			0x00 

/* defines and constants */
#define TWCR_CMD_MASK    					0x0F 
#define TWSR_STATUS_MASK        	   		0xF8 

/* return values */
#define TWI_OK                    			0x00 
#define TWI_ERROR_NODEV                 	0x01 

#define TWI_SEND_DATA_BUFFER_SIZE          	0xff
#define TWI_RECEIVE_DATA_BUFFER_SIZE	    0xff

/*---------------------------------函數(shù)聲名-----------------------------------*/   
/*外部*/
extern void TWI_Init(void); 													
extern void TWI_ISR(void); 														// 在twi中斷中調(diào)用
extern INT8U TWI_MasterSendNI(INT8U deviceAddr, INT8U length, INT8U* data); 
extern INT8U TWI_MasterReceiveNI(INT8U deviceAddr, INT8U length, INT8U *data);
/*內(nèi)部*/
INT8U TWI_GetReceivedByte(void); 
void TWI_SendByte(INT8U data); 
void TWI_ReceiveByte(INT8U ackFlag);
void TWI_SetBitrate	(INT8U bitrateKHz); 
void TWI_SendStart(void); 
void TWI_SendStop(void); 
void TWI_WaitForComplete(void); 
#endif
/*------------------------------------------------------------------------------
                                        0ooo
						      ooo0     (   ) 
                              (   )     ) /
						       \ (     (_/
	    				        \_) 
------------------------------------------------------------------------------*/