NAME

       twi.h -

SYNOPSIS

   Macros
       TWSR values
       Mnemonics:
       TW_MT_xxx - master transmitter
       TW_MR_xxx - master receiver
       TW_ST_xxx - slave transmitter
       TW_SR_xxx - slave receiver

           #define TW_START   0x08
           #define TW_REP_START   0x10
           #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
           #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_ST_SLA_ACK   0xA8
           #define TW_ST_ARB_LOST_SLA_ACK   0xB0
           #define TW_ST_DATA_ACK   0xB8
           #define TW_ST_DATA_NACK   0xC0
           #define TW_ST_LAST_DATA   0xC8
           #define TW_SR_SLA_ACK   0x60
           #define TW_SR_ARB_LOST_SLA_ACK   0x68
           #define TW_SR_GCALL_ACK   0x70
           #define TW_SR_ARB_LOST_GCALL_ACK   0x78
           #define TW_SR_DATA_ACK   0x80
           #define TW_SR_DATA_NACK   0x88
           #define TW_SR_GCALL_DATA_ACK   0x90
           #define TW_SR_GCALL_DATA_NACK   0x98
           #define TW_SR_STOP   0xA0
           #define TW_NO_INFO   0xF8
           #define TW_BUS_ERROR   0x00
           #define TW_STATUS_MASK
           #define TW_STATUS   (TWSR & TW_STATUS_MASK)

       R/~W bit in SLA+R/W address field.

           #define TW_READ   1
           #define TW_WRITE   0

Author

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