at91_twi.h File Reference

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Detailed Description

AT91 two wire interface.

 *
 * $Log: at91_twi.h,v $
 * Revision 1.1  2006/08/31 19:19:55  haraldkipp
 * No time to write comments. ;-)
 *
 *
 * 

TWI Control Register
#define	TWI_CR_OFF   0x00000000
	Control register offset.
#define	TWI_CR   (TWI_BASE + TWI_CR_OFF)
	Control register address.
#define	TWI_START   0x00000001
	Send start condition.
#define	TWI_STOP   0x00000002
	Send stop condition.
#define	TWI_MSEN   0x00000004
	Enable master mode.
#define	TWI_MSDIS   0x00000008
	Disable master mode.
#define	TWI_SVEN   0x00000010
	Enable slave mode.
#define	TWI_SVDIS   0x00000020
	Disable slave mode.
#define	TWI_SWRST   0x00000080
	Software reset.
TWI Master Mode Register
#define	TWI_MMR_OFF   0x00000004
	Master mode register offset.
#define	TWI_MMR   (TWI_BASE + TWI_MMR_OFF)
	Master mode register address.
#define	TWI_IADRSZ   0x00000300
	Internal device address size mask.
#define	TWI_IADRSZ_NONE   0x00000000
	No internal device address.
#define	TWI_IADRSZ_1BYTE   0x00000100
	One byte internal device address.
#define	TWI_IADRSZ_2BYTE   0x00000200
	Two byte internal device address.
#define	TWI_IADRSZ_3BYTE   0x00000300
	Three byte internal device address.
#define	TWI_MREAD   0x00001000
	Master read direction.
#define	TWI_DADR   0x007F0000
	Device address mask.
#define	TWI_DADR_LSB   16
	Device address LSB.
TWI Slave Mode Register
#define	TWI_SMR_OFF   0x00000008
	Slave mode register offset.
#define	TWI_SMR   (TWI_BASE + TWI_SMR_OFF)
	Slave mode register address.
#define	TWI_SADR   0x007F0000
	Slave address mask.
#define	TWI_SADR_LSB   16
	Slave address LSB.
TWI Internal Address Register
#define	TWI_IADRR_OFF   0x0000000C
	Internal address register offset.
#define	TWI_IADRR   (TWI_BASE + TWI_IADRR_OFF)
	Internal address register address.
#define	TWI_IADR   0x00FFFFFF
	Internal address mask.
#define	TWI_IADR_LSB   0
	Internal address LSB.
TWI Clock Waveform Generator Register
#define	TWI_CWGR_OFF   0x00000010
	Clock waveform generator register offset.
#define	TWI_CWGR   (TWI_BASE + TWI_CWGR_OFF)
	Clock waveform generator register address.
#define	TWI_CLDIV   0x000000FF
	Clock low divider mask.
#define	TWI_CLDIV_LSB   0
	Clock low divider LSB.
#define	TWI_CHDIV   0x0000FF00
	Clock high divider mask.
#define	TWI_CHDIV_LSB   8
	Clock high divider LSB.
#define	TWI_CKDIV   0x00070000
	Clock divider mask.
#define	TWI_CKDIV_LSB   16
	Clock divider LSB.
TWI Status and Interrupt Registers
#define	TWI_SR_OFF   0x00000020
	Status register offset.
#define	TWI_SR   (TWI_BASE + TWI_SR_OFF)
	Status register address.
#define	TWI_IER_OFF   0x00000024
	Interrupt enable register offset.
#define	TWI_IER   (TWI_BASE + TWI_IER_OFF)
	Interrupt enable register address.
#define	TWI_IDR_OFF   0x00000028
	Interrupt disable register offset.
#define	TWI_IDR   (TWI_BASE + TWI_IDR_OFF)
	Interrupt disable register address.
#define	TWI_IMR_OFF   0x0000002C
	Interrupt mask register offset.
#define	TWI_IMR   (TWI_BASE + TWI_IMR_OFF)
	Interrupt mask register address.
#define	TWI_TXCOMP   0x00000001
	Transmission completed.
#define	TWI_RXRDY   0x00000002
	Receive holding register ready.
#define	TWI_TXRDY   0x00000004
	Transmit holding register ready.
#define	TWI_SVREAD   0x00000008
	Slave read.
#define	TWI_SVACC   0x00000010
	Slave access.
#define	TWI_GACC   0x00000020
	General call access.
#define	TWI_OVRE   0x00000040
	Overrun error.
#define	TWI_NACK   0x00000100
	Not acknowledged.
#define	TWI_ARBLST   0x00000200
	Arbitration lost.
#define	TWI_SCLWS   0x00000400
	Clock wait state.
#define	TWI_EOSACC   0x00000800
	End of slave access.
TWI Receive Holding Register
#define	TWI_RHR_OFF   0x00000030
	Receive holding register offset.
#define	TWI_RHR   (TWI_BASE + TWI_RHR_OFF)
	Receive holding register address.
TWI Transmit Holding Register
#define	TWI_THR_OFF   0x00000034
	Transmit holding register offset.
#define	TWI_THR   (TWI_BASE + TWI_THR_OFF)
	Transmit holding register address.

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