Wiblocks --- TWI

TWI/TWI.h

00001 
00002 
00003 
00004 
00005 #ifndef __TWI_H__
00006 #define __TWI_H__
00007 
00008 #include <inttypes.h>
00009 
00014 #define TWI_BUFFER_SIZE    20   
00015 
00017 
00021 
00022 #define TWI_TWPS           0x00 
00023 #define TWI_TWBR           0x34 
00024 
00025 
00029 union twi_status_reg 
00030 {
00031   unsigned char all; 
00032   struct
00033   {
00034     unsigned char last_trans_ok:1; 
00035     unsigned char unused_bits:7;   
00036   };
00037 };
00038 
00039 extern union twi_status_reg twi_status_reg;
00040 
00044 void twi_master_init( void );
00045 unsigned char twi_busy_p( void );
00046 unsigned char twi_get_state( void );
00047 void twi_transmit( unsigned char * , unsigned char );
00048 void twi_resend( void );
00049 unsigned char twi_get_data( unsigned char *, unsigned char );
00050 
00054 
00055 #define TWI_READ_BIT  0       
00056 #define TWI_ADR_BITS  1       
00057 
00058 #define TRUE          1
00059 #define FALSE         0
00060 
00064 
00068 
00069 #define TWI_START                  0x08  
00070 #define TWI_REP_START              0x10  
00071 #define TWI_ARB_LOST               0x38  
00072 
00076 
00077 #define TWI_MTX_ADR_ACK            0x18  
00078 #define TWI_MTX_ADR_NACK           0x20  
00079 #define TWI_MTX_DATA_ACK           0x28  
00080 #define TWI_MTX_DATA_NACK          0x30  
00081 
00085 
00086 #define TWI_MRX_ADR_ACK            0x40  
00087 #define TWI_MRX_ADR_NACK           0x48  
00088 #define TWI_MRX_DATA_ACK           0x50  
00089 #define TWI_MRX_DATA_NACK          0x58  
00090 
00094 
00095 #define TWI_STX_ADR_ACK            0xA8  
00096 #define TWI_STX_ADR_ACK_M_ARB_LOST 0xB0  
00097 
00098 #define TWI_STX_DATA_ACK           0xB8  
00099 #define TWI_STX_DATA_NACK          0xC0  
00100 #define TWI_STX_DATA_ACK_LAST_BYTE 0xC8  
00101 
00102 
00103 
00104 
00105 
00106 #define TWI_SRX_ADR_ACK            0x60  
00107 #define TWI_SRX_ADR_ACK_M_ARB_LOST 0x68  
00108 
00109 #define TWI_SRX_GEN_ACK            0x70  
00110 #define TWI_SRX_GEN_ACK_M_ARB_LOST 0x78  
00111 
00112 
00113 #define TWI_SRX_ADR_DATA_ACK       0x80  
00114 
00115 #define TWI_SRX_ADR_DATA_NACK      0x88  
00116 
00117 #define TWI_SRX_GEN_DATA_ACK       0x90  
00118 
00119 #define TWI_SRX_GEN_DATA_NACK      0x98  
00120 
00121 #define TWI_SRX_STOP_RESTART       0xA0  
00122 
00123 
00124 
00125 
00126 
00127 #define TWI_NO_STATE               0xF8  
00128 #define TWI_BUS_ERROR              0x00  
00129 
00130 #endif
Generated on Sun Dec 13 16:47:18 2009 by  doxygen 1.6.1