Provided by: avr-libc_1.7.1-2_all bug

NAME

       <util/twi.h>: TWI bit mask definitions -

   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

Detailed Description

        #include <util/twi.h>

       This header file contains bit mask definitions for use with the AVR TWI interface.

Define Documentation

   #define TW_BUS_ERROR   0x00 illegal start or stop condition
   #define TW_MR_ARB_LOST   0x38 arbitration lost in SLA+R or NACK
   #define TW_MR_DATA_ACK   0x50 data received, ACK returned
   #define TW_MR_DATA_NACK   0x58 data received, NACK returned
   #define TW_MR_SLA_ACK   0x40 SLA+R transmitted, ACK received
   #define TW_MR_SLA_NACK   0x48 SLA+R transmitted, NACK received
   #define TW_MT_ARB_LOST   0x38 arbitration lost in SLA+W or data
   #define TW_MT_DATA_ACK   0x28 data transmitted, ACK received
   #define TW_MT_DATA_NACK   0x30 data transmitted, NACK received
   #define TW_MT_SLA_ACK   0x18 SLA+W transmitted, ACK received
   #define TW_MT_SLA_NACK   0x20 SLA+W transmitted, NACK received
   #define TW_NO_INFO   0xF8 no state information available
   #define TW_READ   1 SLA+R address
   #define TW_REP_START   0x10 repeated start condition transmitted
   #define TW_SR_ARB_LOST_GCALL_ACK   0x78 arbitration lost in SLA+RW, general call received, ACK
       returned
   #define TW_SR_ARB_LOST_SLA_ACK   0x68 arbitration lost in SLA+RW, SLA+W received, ACK returned
   #define TW_SR_DATA_ACK   0x80 data received, ACK returned
   #define TW_SR_DATA_NACK   0x88 data received, NACK returned
   #define TW_SR_GCALL_ACK   0x70 general call received, ACK returned
   #define TW_SR_GCALL_DATA_ACK   0x90 general call data received, ACK returned
   #define TW_SR_GCALL_DATA_NACK   0x98 general call data received, NACK returned
   #define TW_SR_SLA_ACK   0x60 SLA+W received, ACK returned
   #define TW_SR_STOP   0xA0 stop or repeated start condition received while selected
   #define TW_ST_ARB_LOST_SLA_ACK   0xB0 arbitration lost in SLA+RW, SLA+R received, ACK returned
   #define TW_ST_DATA_ACK   0xB8 data transmitted, ACK received
   #define TW_ST_DATA_NACK   0xC0 data transmitted, NACK received
   #define TW_ST_LAST_DATA   0xC8 last data byte transmitted, ACK received
   #define TW_ST_SLA_ACK   0xA8 SLA+R received, ACK returned
   #define TW_START   0x08 start condition transmitted
   #define TW_STATUS   (TWSR & TW_STATUS_MASK) TWSR, masked by TW_STATUS_MASK
   #define TW_STATUS_MASK Value:
       (_BV(TWS7)|_BV(TWS6)|_BV(TWS5)|_BV(TWS4)|                                _BV(TWS3))
       The lower 3 bits of TWSR are reserved on the ATmega163. The 2 LSB carry the prescaler bits
       on the newer ATmegas.

   #define TW_WRITE   0 SLA+W address

Author

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