util_twi

#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))

#define TW_WRITE 0

SLA+W address