Software TWI (I2C) Control Macros

Macros for controlling SCL and SDA lines in software TWI implementation. More...

Macros
#define	SCL_LOW()
#define	SDA_LOW()
#define	SCL_HIGH()
#define	SDA_HIGH()
#define	SCL_LOW()
#define	SDA_LOW()
#define	SCL_HIGH()
#define	SDA_HIGH()

Detailed Description

Macros for controlling SCL and SDA lines in software TWI implementation.

This group contains macros to set SCL and SDA lines to logical HIGH or LOW. The implementation differs based on whether TWI_SOFT_PULLUP_ENABLE is defined:

• With pull-up enabled: PORT and DDR registers are adjusted.
• Without pull-up: only DDR registers are modified.

This group contains macros to set SCL and SDA lines to logical HIGH or LOW.

Macro Definition Documentation

SCL_HIGH [1/2]

#define SCL_HIGH

(

)

Value:

{ TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SCL);  TWI_SOFT_PORT |= (1<<TWI_SOFT_SCL); }

SCL_HIGH [2/2]

#define SCL_HIGH

(

)

Value:

{ TWI_SOFT_PORT.DIRCLR = TWI_SOFT_SCL; TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SCL; }

SCL_LOW [1/2]

#define SCL_LOW

(

)

Value:

{ TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SCL); TWI_SOFT_DDR |= (1<<TWI_SOFT_SCL); }

SCL_LOW [2/2]

#define SCL_LOW

(

)

Value:

{ TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SCL; TWI_SOFT_PORT.DIRSET = TWI_SOFT_SCL; }

SDA_HIGH [1/2]

#define SDA_HIGH

(

)

Value:

{ TWI_SOFT_DDR &= ~(1<<TWI_SOFT_SDA);  TWI_SOFT_PORT |= (1<<TWI_SOFT_SDA); }

SDA_HIGH [2/2]

#define SDA_HIGH

(

)

Value:

{ TWI_SOFT_PORT.DIRCLR = TWI_SOFT_SDA; TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SDA; }

SDA_LOW [1/2]

#define SDA_LOW

(

)

Value:

{ TWI_SOFT_PORT &= ~(1<<TWI_SOFT_SDA); TWI_SOFT_DDR |= (1<<TWI_SOFT_SDA); }

SDA_LOW [2/2]

#define SDA_LOW

(

)

Value:

{ TWI_SOFT_PORT.OUTCLR = TWI_SOFT_SDA; TWI_SOFT_PORT.DIRSET = TWI_SOFT_SDA; }