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/************************************************************************************
* arch/z80/src/ez80/ez80f91_i2c.h
* arch/z80/src/chip/ez80f91_i2c.h
*
* Copyright (C) 2009 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_Z80_SRC_EZ80_EZ80F91_I2C_H
#define __ARCH_Z80_SRC_EZ80_EZ80F91_I2C_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
/************************************************************************************
* Definitions
************************************************************************************/
/* I2C Registers ******************************************************************/
/* Provided in ez80f91.h */
/* I2C Register Bit Definitions ***************************************************/
/* Slave Address Register (SAR) Bit Definitions */
#define I2C_SAR_GCE (1 << 0) /* Bit 0: 1=I2C enabled to recognize the General Call Address */
#define I2C_SAR_SLA_SHIFT 1 /* Bits 1-7: 7-bit address or upper 2 bits in 10-bit mode */
#define I2C_SAR_SLA_MASK (0x7f << 1)
/* Extended Slave Address Register (XSAR) Bit Definitions */
/* Bits 0-7: Least significant 8-bits of 10-bit slave address */
/* Data Byte Register (DR) Bit Definitions */
/* Bits 0-7: I2C byte data */
/* Control (CTL) Register Bit Definitions */
#define I2C_CTL_AAK (1 << 2) /* Bit 2: 1=Acknowledge */
#define I2C_CTL_IFLG (1 << 3) /* Bit 3: 1=I2C interrupt flag is set */
#define I2C_CTL_STP (1 << 4) /* Bit 4: 1=Master mode stop-transmit STOP condition on the bus */
#define I2C_CTL_STA (1 << 5) /* Bit 5: 1=Master mode start-transmit START condition on the bus */
#define I2C_CTL_ENAB (1 << 6) /* Bit 6: 1=I2C bus (SCL/SDA) is enabled */
#define I2C_CTL_IEN (1 << 7) /* Bit 7: 1=I2C interrupt is enabled */
/* Status Register (SR) Bit Definitions */
#define I2C_SR_SHIFT 3 /* Bits 3-7: 5-bit status code */
#define I2C_SR_MASK (0x1c << I2C_SR_SHIFT)
/* Clock Control Register (CCR) Bit Definitions */
#define I2C_CCR_NSHIFT 0 /* Bits 0-2: I2C clock divider exponent */
#define I2C_CCR_NMASK (0x07 << I2C_CCR_NSHIFT)
#define I2C_CCR_MSHIFT 3 /* Bits 3-6: I2C clock divider scalar value */
#define I2C_CCR_NMASK (0x0f << I2C_CCR_MSHIFT)
/* Software Reset Register (SRR) Bit Definitions */
/* Writing any value to this register performs a software reset of the I2C module */
/************************************************************************************
* Public Types
************************************************************************************/
/************************************************************************************
* Public Data
************************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif /* __cplusplus */
/************************************************************************************
* Public Functions
************************************************************************************/
#undef EXTERN
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_Z80_SRC_EZ80_EZ80F91_I2C_H */
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