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/************************************************************************************
* arch/avr/src/at91uc3/at91uc3_twi.h
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
#ifndef __ARCH_AVR_SRC_AT91UC3_AT91UC3_TWI_H
#define __ARCH_AVR_SRC_AT91UC3_AT91UC3_TWI_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* Register offsets *****************************************************************/
#define AVR32_TWI_CR_OFFSET 0x00 /* Control Register */
#define AVR32_TWI_MMR_OFFSET 0x04 /* Master Mode Register */
#define AVR32_TWI_SMR_OFFSET 0x08 /* Slave Mode Register */
#define AVR32_TWI_IADR_OFFSET 0x0c /* Internal Address Register */
#define AVR32_TWI_CWGR_OFFSET 0x10 /* Clock Waveform Generator Register */
#define AVR32_TWI_SR_OFFSET 0x20 /* Status Register */
#define AVR32_TWI_IER_OFFSET 0x24 /* Interrupt Enable Register */
#define AVR32_TWI_IDR_OFFSET 0x28 /* Interrupt Disable Register */
#define AVR32_TWI_IMR_OFFSET 0x2c /* Interrupt Mask Register */
#define AVR32_TWI_RHR_OFFSET 0x30 /* Receive Holding Register */
#define AVR32_TWI_THR_OFFSET 0x34 /* Transmit Holding Register */
/* Register Addresses ***************************************************************/
#define AVR32_TWI_CR (AVR32_TWI_BASE+AVR32_TWI_CR_OFFSET)
#define AVR32_TWI_MMR (AVR32_TWI_BASE+AVR32_TWI_MMR_OFFSET)
#define AVR32_TWI_SMR (AVR32_TWI_BASE+AVR32_TWI_SMR_OFFSET)
#define AVR32_TWI_IADR (AVR32_TWI_BASE+AVR32_TWI_IADR_OFFSET)
#define AVR32_TWI_CWGR (AVR32_TWI_BASE+AVR32_TWI_CWGR_OFFSET)
#define AVR32_TWI_SR (AVR32_TWI_BASE+AVR32_TWI_SR_OFFSET)
#define AVR32_TWI_IER (AVR32_TWI_BASE+AVR32_TWI_IER_OFFSET)
#define AVR32_TWI_IDR (AVR32_TWI_BASE+AVR32_TWI_IDR_OFFSET)
#define AVR32_TWI_IMR (AVR32_TWI_BASE+AVR32_TWI_IMR_OFFSET)
#define AVR32_TWI_RHR (AVR32_TWI_BASE+AVR32_TWI_RHR_OFFSET)
#define AVR32_TWI_THR (AVR32_TWI_BASE+AVR32_TWI_THR_OFFSET)
/* Register Bit-field Definitions ***************************************************/
/* Control Register Bit-field Definitions */
#define TWI_CR_START (1 << 0) /* Bit 0: Send a START Condition */
#define TWI_CR_STOP (1 << 1) /* Bit 1: Send a STOP Condition */
#define TWI_CR_MSEN (1 << 2) /* Bit 2: TWI Master Mode Enabled */
#define TWI_CR_MSDIS (1 << 3) /* Bit 3: TWI Master Mode Disabled */
#define TWI_CR_SVEN (1 << 4) /* Bit 4: TWI Slave Mode Enabled */
#define TWI_CR_SVDIS (1 << 5) /* Bit 5: TWI Slave Mode Disabled */
#define TWI_CR_SWRST (1 << 7) /* Bit 6: Software Reset */
/* Master Mode Register Bit-field Definitions */
#define TWI_MMR_IADRSZ_SHIFT (8) /* Bits 8-9: Internal Device Address Size */
#define TWI_MMR_IADRSZ_MASK (3 << TWI_MMR_IADRSZ_SHIFT)
# define TWI_MMR_IADRSZ_ NONE (0 << TWI_MMR_IADRSZ_SHIFT) /* No internal device address */
# define TWI_MMR_IADRSZ_1BYTE (1 << TWI_MMR_IADRSZ_SHIFT) /* One-byte internal device address */
# define TWI_MMR_IADRSZ_2BYTES (2 << TWI_MMR_IADRSZ_SHIFT) /* Two-byte internal device address */
# define TWI_MMR_IADRSZ_3BYTES (3 << TWI_MMR_IADRSZ_SHIFT) /* Three-byte internal device address */
#define TWI_MMR_MREAD (1 << 12) /* Bit 12: Master Read Direction */
#define TWI_MMR_DADR_SHIFT (16) /* Bits 16-22: Device Address */
#define TWI_MMR_DADR:_MASK (0x7f << TWI_MMR_DADR_SHIFT)
/* Slave Mode Register Bit-field Definitions */
#define TWI_SMR_SADR_SHIFT (16) /* Bits 16-22: Slave Address */
#define TWI_SMR_SADR_MASK (0x7f << TWI_SMR_SADR_SHIFT)
/* Internal Address Register Bit-field Definitions */
#define TWI_IADR_MASK (0x00ffffff)
/* Clock Waveform Generator Register Bit-field Definitions */
#define TWI_CWGR_CLDIV_SHIFT (0) /* Bits 0-7: Clock Low Divider */
#define TWI_CWGR_CLDIV_MASK (0xff <<TWI_CWGR_CLDIV_SHIFT)
#define TWI_CWGR_CHDIV_SHIFT (8) /* Bits 8-15: Clock High Divider */
#define TWI_CWGR_CHDIV_MASK (0xff << TWI_CWGR_CHDIV_SHIFT)
#define TWI_CWGR_CKDIV_SHIFT (16) /* Bits 16-18: Clock Divider */
#define TWI_CWGR_CKDIV:_MASK (7 << TWI_CWGR_CKDIV_SHIFT)
/* Status Register Bit-field Definitions */
/* Interrupt Enable Register Bit-field Definitions */
/* Interrupt Disable Register Bit-field Definitions */
/* Interrupt Mask Register Bit-field Definitions */
#define TWI_INT_TXCOMP (1 << 0) /* Bit 0: Transmission Completed (automatically set / reset) */
#define TWI_INT_RXRDY (1 << 1) /* Bit 1: Receive Holding Register Ready (automatically set / reset) */
#define TWI_INT_TXRDY (1 << 2) /* Bit 2: Transmit Holding Register Ready (automatically set / reset) */
#define TWI_SR_SVREAD (1 << 3) /* Bit 3: Slave Read (automatically set / reset) */
#define TWI_INT_SVACC (1 << 4) /* Bit 4: Slave Access (automatically set / reset) */
#define TWI_INT_GACC (1 << 5) /* Bit 5: General Call Access (clear on read) */
#define TWI_INT_OVRE (1 << 6) /* Bit 6: Overrun Error (clear on read) */
#define TWI_INT_NACK (1 << 8) /* Bit 8: Not Acknowledged (clear on read) */
#define TWI_INT_ARBLST (1 << 9) /* Bit 9: Arbitration Lost (clear on read) */
#define TWI_INT_SCLWS (1 << 10) /* Bit 10: Clock Wait State (automatically set / reset) */
#define TWI_INT_EOSACC (1 << 11) /* Bit 11: End Of Slave Access (clear on read) */
#define TWI_INT_ENDRX (1 << 12) /* Bit 12: End of RX buffer */
#define TWI_INT_ENDTX (1 << 13) /* Bit 13: End of TX buffer */
#define TWI_INT_RXBUFF (1 << 14) /* Bit 14: RX Buffer Full */
#define TWI_INT_TXBUFE (1 << 15) /* Bit 15: TX Buffer Empty */
/* Receive Holding Register Bit-field Definitions */
#define TWI_RHR_MASK (0xff)
/* Transmit Holding Register Bit-field Definitions */
#define TWI_THR_MASK (0xff)
/************************************************************************************
* Public Types
************************************************************************************/
/************************************************************************************
* Public Data
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
#endif /* __ARCH_AVR_SRC_AT91UC3_AT91UC3_TWI_H */
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