at91_twi.h File Reference

Go to the source code of this file.

Defines

#define TWI_CR_OFF   0x00000000
 TWI Control Register.
#define TWI_CR   (*((reg32_t *)(TWI_BASE + TWI_CR_OFF)))
 Control register address.
#define TWI_START   0
 Send start condition.
#define TWI_STOP   1
 Send stop condition.
#define TWI_MSEN   2
 Enable master mode.
#define TWI_MSDIS   3
 Disable master mode.
#define TWI_SWRST   7
 Software reset.
#define TWI_MMR_OFF   0x00000004
 TWI Master Mode Register.
#define TWI_MMR   (*((reg32_t *)(TWI_BASE + TWI_MMR_OFF)))
 Master mode register address.
#define TWI_IADRSZ_SHIFT   8
 Internal device address size shift.
#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   12
 Master read direction.
#define TWI_DADR   0x007F0000
 Device address mask.
#define TWI_DADR_SHIFT   16
 Device address LSB.
#define TWI_IADR_OFF   0x0000000C
 TWI Internal Address Register.
#define TWI_IADR   (*((reg32_t *)(TWI_BASE + TWI_IADR_OFF)))
 Internal address register address.
#define TWI_IADR_MASK   0x00FFFFFF
 Internal address mask.
#define TWI_IADR_SHIFT   0
 Internal address LSB.
#define TWI_CWGR_OFF   0x00000010
 TWI Clock Waveform Generator Register.
#define TWI_CWGR   (*((reg32_t *)(TWI_BASE + TWI_CWGR_OFF)))
 Clock waveform generator register address.
#define TWI_CLDIV   0x000000FF
 Clock low divider mask.
#define TWI_CLDIV_SHIFT   0
 Clock low divider LSB.
#define TWI_CHDIV   0x0000FF00
 Clock high divider mask.
#define TWI_CHDIV_SHIFT   8
 Clock high divider LSB.
#define TWI_CKDIV   0x00070000
 Clock divider mask.
#define TWI_CKDIV_SHIFT   16
 Clock divider LSB.
#define TWI_SR_OFF   0x00000020
 TWI Status and Interrupt Registers.
#define TWI_SR   (*((reg32_t *)(TWI_BASE + TWI_SR_OFF)))
 Status register address.
#define TWI_IER_OFF   0x00000024
 Interrupt enable register offset.
#define TWI_IER   (*((reg32_t *)(TWI_BASE + TWI_IER_OFF)))
 Interrupt enable register address.
#define TWI_IDR_OFF   0x00000028
 Interrupt disable register offset.
#define TWI_IDR   (*((reg32_t *)(TWI_BASE + TWI_IDR_OFF)))
 Interrupt disable register address.
#define TWI_IMR_OFF   0x0000002C
 Interrupt mask register offset.
#define TWI_IMR   (*((reg32_t *)(TWI_BASE + TWI_IMR_OFF)))
 Interrupt mask register address.
#define TWI_TXCOMP   0
 Transmission completed.
#define TWI_RXRDY   1
 Receive holding register ready.
#define TWI_TXRDY   2
 Transmit holding register ready.
#define TWI_NACK   8
 Not acknowledged.
#define TWI_RHR_OFF   0x00000030
 TWI Receive Holding Register.
#define TWI_RHR   (*((reg32_t *)(TWI_BASE + TWI_RHR_OFF)))
 Receive holding register address.
#define TWI_THR_OFF   0x00000034
 TWI Transmit Holding Register.
#define TWI_THR   (*((reg32_t *)(TWI_BASE + TWI_THR_OFF)))
 Transmit holding register address.

Detailed Description

Author:
Francesco Sacchi <batt@develer.com>

AT91SAM7 Two wire interface. This file is based on NUT/OS implementation. See license below.

Definition in file at91_twi.h.

Define Documentation

#define TWI_CR_OFF   0x00000000

TWI Control Register.

Control register offset.

Definition at line 80 of file at91_twi.h.

#define TWI_CWGR_OFF   0x00000010

TWI Clock Waveform Generator Register.

Clock waveform generator register offset.

Definition at line 124 of file at91_twi.h.

#define TWI_IADR_OFF   0x0000000C

TWI Internal Address Register.

Internal address register offset.

Definition at line 114 of file at91_twi.h.

#define TWI_MMR_OFF   0x00000004

TWI Master Mode Register.

Master mode register offset.

Definition at line 97 of file at91_twi.h.

#define TWI_RHR_OFF   0x00000030

TWI Receive Holding Register.

Receive holding register offset.

Definition at line 177 of file at91_twi.h.

#define TWI_SR_OFF   0x00000020

TWI Status and Interrupt Registers.

Status register offset.

Definition at line 138 of file at91_twi.h.

#define TWI_THR_OFF   0x00000034

TWI Transmit Holding Register.

Transmit holding register offset.

Definition at line 185 of file at91_twi.h.