avr-libc: twi.h File Reference

avr-libc 2.0.0

Standard C library for AVR-GCC

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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