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util_twi
Langue: en
Version: 345940 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- Detailed Description
- Define Documentation
- #define TW_BUS_ERROR 0x00illegal start or stop condition
- #define TW_MR_ARB_LOST 0x38arbitration lost in SLA+R or NACK
- #define TW_MR_DATA_ACK 0x50data received, ACK returned
- #define TW_MR_DATA_NACK 0x58data received, NACK returned
- #define TW_MR_SLA_ACK 0x40SLA+R transmitted, ACK received
- #define TW_MR_SLA_NACK 0x48SLA+R transmitted, NACK received
- #define TW_MT_ARB_LOST 0x38arbitration lost in SLA+W or data
- #define TW_MT_DATA_ACK 0x28data transmitted, ACK received
- #define TW_MT_DATA_NACK 0x30data transmitted, NACK received
- #define TW_MT_SLA_ACK 0x18SLA+W transmitted, ACK received
- #define TW_MT_SLA_NACK 0x20SLA+W transmitted, NACK received
- #define TW_NO_INFO 0xF8no state information available
- #define TW_READ 1SLA+R address
- #define TW_REP_START 0x10repeated start condition transmitted
- #define TW_SR_ARB_LOST_GCALL_ACK 0x78arbitration lost in SLA+RW, general call received, ACK returned
- #define TW_SR_ARB_LOST_SLA_ACK 0x68arbitration lost in SLA+RW, SLA+W received, ACK returned
- #define TW_SR_DATA_ACK 0x80data received, ACK returned
- #define TW_SR_DATA_NACK 0x88data received, NACK returned
- #define TW_SR_GCALL_ACK 0x70general call received, ACK returned
- #define TW_SR_GCALL_DATA_ACK 0x90general call data received, ACK returned
- #define TW_SR_GCALL_DATA_NACK 0x98general call data received, NACK returned
- #define TW_SR_SLA_ACK 0x60SLA+W received, ACK returned
- #define TW_SR_STOP 0xA0stop or repeated start condition received while selected
- #define TW_ST_ARB_LOST_SLA_ACK 0xB0arbitration lost in SLA+RW, SLA+R received, ACK returned
- #define TW_ST_DATA_ACK 0xB8data transmitted, ACK received
- #define TW_ST_DATA_NACK 0xC0data transmitted, NACK received
- #define TW_ST_LAST_DATA 0xC8last data byte transmitted, ACK received
- #define TW_ST_SLA_ACK 0xA8SLA+R received, ACK returned
- #define TW_START 0x08start condition transmitted
- #define TW_STATUS (TWSR & TW_STATUS_MASK)TWSR, masked by TW_STATUS_MASK
- #define TW_STATUS_MASKValue:
- #define TW_WRITE 0SLA+W address
- Author
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 0x00illegal start or stop condition
#define TW_MR_ARB_LOST 0x38arbitration lost in SLA+R or NACK
#define TW_MR_DATA_ACK 0x50data received, ACK returned
#define TW_MR_DATA_NACK 0x58data received, NACK returned
#define TW_MR_SLA_ACK 0x40SLA+R transmitted, ACK received
#define TW_MR_SLA_NACK 0x48SLA+R transmitted, NACK received
#define TW_MT_ARB_LOST 0x38arbitration lost in SLA+W or data
#define TW_MT_DATA_ACK 0x28data transmitted, ACK received
#define TW_MT_DATA_NACK 0x30data transmitted, NACK received
#define TW_MT_SLA_ACK 0x18SLA+W transmitted, ACK received
#define TW_MT_SLA_NACK 0x20SLA+W transmitted, NACK received
#define TW_NO_INFO 0xF8no state information available
#define TW_READ 1SLA+R address
#define TW_REP_START 0x10repeated start condition transmitted
#define TW_SR_ARB_LOST_GCALL_ACK 0x78arbitration lost in SLA+RW, general call received, ACK returned
#define TW_SR_ARB_LOST_SLA_ACK 0x68arbitration lost in SLA+RW, SLA+W received, ACK returned
#define TW_SR_DATA_ACK 0x80data received, ACK returned
#define TW_SR_DATA_NACK 0x88data received, NACK returned
#define TW_SR_GCALL_ACK 0x70general call received, ACK returned
#define TW_SR_GCALL_DATA_ACK 0x90general call data received, ACK returned
#define TW_SR_GCALL_DATA_NACK 0x98general call data received, NACK returned
#define TW_SR_SLA_ACK 0x60SLA+W received, ACK returned
#define TW_SR_STOP 0xA0stop or repeated start condition received while selected
#define TW_ST_ARB_LOST_SLA_ACK 0xB0arbitration lost in SLA+RW, SLA+R received, ACK returned
#define TW_ST_DATA_ACK 0xB8data transmitted, ACK received
#define TW_ST_DATA_NACK 0xC0data transmitted, NACK received
#define TW_ST_LAST_DATA 0xC8last data byte transmitted, ACK received
#define TW_ST_SLA_ACK 0xA8SLA+R received, ACK returned
#define TW_START 0x08start condition transmitted
#define TW_STATUS (TWSR & TW_STATUS_MASK)TWSR, masked by TW_STATUS_MASK
#define TW_STATUS_MASKValue:
(_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 0SLA+W address
Author
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