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

avr-libc 2.1.0

Standard C library for AVR-GCC

AVR Libc Home Page

AVRs

AVR Libc Development Pages

Main Page

User Manual

Library Reference

FAQ

Example Projects

[フレーム]

<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.

Macro Definition Documentation

◆ TW_BUS_ERROR

#define TW_BUS_ERROR 0x00

illegal start or stop condition

◆ TW_MR_ARB_LOST

#define TW_MR_ARB_LOST 0x38

arbitration lost in SLA+R or NACK

◆ TW_MR_DATA_ACK

#define TW_MR_DATA_ACK 0x50

data received, ACK returned

◆ TW_MR_DATA_NACK

#define TW_MR_DATA_NACK 0x58

data received, NACK returned

◆ TW_MR_SLA_ACK

#define TW_MR_SLA_ACK 0x40

SLA+R transmitted, ACK received

◆ TW_MR_SLA_NACK

#define TW_MR_SLA_NACK 0x48

SLA+R transmitted, NACK received

◆ TW_MT_ARB_LOST

#define TW_MT_ARB_LOST 0x38

arbitration lost in SLA+W or data

◆ TW_MT_DATA_ACK

#define TW_MT_DATA_ACK 0x28

data transmitted, ACK received

◆ TW_MT_DATA_NACK

#define TW_MT_DATA_NACK 0x30

data transmitted, NACK received

◆ TW_MT_SLA_ACK

#define TW_MT_SLA_ACK 0x18

SLA+W transmitted, ACK received

◆ TW_MT_SLA_NACK

#define TW_MT_SLA_NACK 0x20

SLA+W transmitted, NACK received

◆ TW_NO_INFO

#define TW_NO_INFO 0xF8

no state information available

◆ TW_READ

#define TW_READ 1

SLA+R address

◆ TW_REP_START

#define TW_REP_START 0x10

repeated start condition transmitted

◆ TW_SR_ARB_LOST_GCALL_ACK

#define TW_SR_ARB_LOST_GCALL_ACK 0x78

arbitration lost in SLA+RW, general call received, ACK returned

◆ TW_SR_ARB_LOST_SLA_ACK

#define TW_SR_ARB_LOST_SLA_ACK 0x68

arbitration lost in SLA+RW, SLA+W received, ACK returned

◆ TW_SR_DATA_ACK

#define TW_SR_DATA_ACK 0x80

data received, ACK returned

◆ TW_SR_DATA_NACK

#define TW_SR_DATA_NACK 0x88

data received, NACK returned

◆ TW_SR_GCALL_ACK

#define TW_SR_GCALL_ACK 0x70

general call received, ACK returned

◆ TW_SR_GCALL_DATA_ACK

#define TW_SR_GCALL_DATA_ACK 0x90

general call data received, ACK returned

◆ TW_SR_GCALL_DATA_NACK

#define TW_SR_GCALL_DATA_NACK 0x98

general call data received, NACK returned

◆ TW_SR_SLA_ACK

#define TW_SR_SLA_ACK 0x60

SLA+W received, ACK returned

◆ TW_SR_STOP

#define TW_SR_STOP 0xA0

stop or repeated start condition received while selected

◆ TW_ST_ARB_LOST_SLA_ACK

#define TW_ST_ARB_LOST_SLA_ACK 0xB0

arbitration lost in SLA+RW, SLA+R received, ACK returned

◆ TW_ST_DATA_ACK

#define TW_ST_DATA_ACK 0xB8

data transmitted, ACK received

◆ TW_ST_DATA_NACK

#define TW_ST_DATA_NACK 0xC0

data transmitted, NACK received

◆ TW_ST_LAST_DATA

#define TW_ST_LAST_DATA 0xC8

last data byte transmitted, ACK received

◆ TW_ST_SLA_ACK

#define TW_ST_SLA_ACK 0xA8

SLA+R received, ACK returned

◆ TW_START

#define TW_START 0x08

start condition transmitted

◆ TW_STATUS

#define TW_STATUS (TWSR & TW_STATUS_MASK)

TWSR, masked by TW_STATUS_MASK

◆ TW_STATUS_MASK

#define TW_STATUS_MASK

Value:

(_BV(TWS7)|_BV(TWS6)|_BV(TWS5)|_BV(TWS4)|\

_BV(TWS3))

_BV

#define _BV(bit)

Definition: sfr_defs.h:208

The lower 3 bits of TWSR are reserved on the ATmega163. The 2 LSB carry the prescaler bits on the newer ATmegas.

◆ TW_WRITE

#define TW_WRITE 0

SLA+W address

Generated on Sat Jan 29 2022 00:24:04 for avr-libc by doxygen 1.8.14