132 lines
4.4 KiB
C
132 lines
4.4 KiB
C
/*
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* Copyright (c) 2014, Ingo Gulyas Intembsys
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* I2C driver for ATMEGA128rfa1
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*
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* \author
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* Ingo Gulyas Intembsys
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* office@intembsys.at
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* www.intembsys.at
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*/
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#ifndef I2C_H_
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#define I2C_H_
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#include <stdint.h>
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////////////////////////////////////////////////////////////////////////////////////////////
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// CONFIGURATION SECTION:
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#define I2C_TD 0 // compiler switch: i2c testdriver code
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#define I2C_PORT PORTD
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#define I2C_DDR DDRD
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#define I2C_SCL_PIN 0
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#define I2C_SDA_PIN 1
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// END OF CONFIGURATION SECTION
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////////////////////////////////////////////////////////////////////////////////////////////
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#define I2C_INIT() ({I2C_DDR &= ~((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN)); I2C_PORT |= ((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN));})
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#define I2C_DEINIT() ({I2C_DDR &= ~((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN)); I2C_PORT |= ((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN));})
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#define I2C_FREQ_STANDARD I2C_FREQ_50KHZ
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#if F_CPU == 16000000UL
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#define I2C_FREQ_400KHZ 0x03
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#define I2C_FREQ_250KHZ 0x06
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#define I2C_FREQ_100KHZ 0x12
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#define I2C_FREQ_50KHZ 0x26
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#define I2C_FREQ_10KHZ 0xC6
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#else
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#error "NO I2C FREQUENCY DEFINED -> CHECK F_CPU SETTINGS!"
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#endif
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#define I2C_STATUS_REG TWSR
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#define I2C_TX_REG TWDR
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#define I2C_RX_REG TWDR
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#define I2C_START() (TWCR = (1<<TWINT) |(1<<TWSTA) | (1<<TWEN))
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#define I2C_STOP() (TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO))
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#define I2C_WRITE_BYTE() (TWCR = (1<<TWINT) | (1<<TWEN))
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#define I2C_READ_BYTE_ACK() (TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA))
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#define I2C_READ_BYTE_NACK() (TWCR = (1<<TWINT) | (1<<TWEN))
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#define I2C_STATUS() (I2C_STATUS_REG & I2C_STATUS_MASK)
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#define I2C_STATUS_MASK 0xF8
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#define I2C_STATUS_START 0x08
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#define I2C_STATUS_START_REP 0x10
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#define I2C_STATUS_SLAW_ACK 0x18
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#define I2C_STATUS_DATAW_ACK 0x28
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#define I2C_STATUS_SLAR_ACK 0x40
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#define I2C_STATUS_DATAR_ACK 0x50
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#define I2C_STATUS_DATAR_NACK 0x58
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#define I2C_ADR_WR(adr) ((adr<<1) & ~(1<<0))
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#define I2C_ADR_RD(adr) ((adr<<1) | (1<<0))
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#define I2C_CMD_FLAG_NONE 0x00
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#define I2C_CMD_FLAG_START (1<<0)
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#define I2C_CMD_FLAG_STOP (1<<1)
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#define I2C_OK 0
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#define I2C_ERROR_DRIVER -1
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#define I2C_ERROR_TIMEOUT -2
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#define I2C_ERROR_START -3
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#define I2C_ERROR_WRITE -4
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#define I2C_ERROR_READ -5
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#define I2C_IOCTL_CMD_SET_FREQ 0x01
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typedef struct i2c_driver i2c_driver;
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struct i2c_driver
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{
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int8_t (*ioctl)(const i2c_driver* const me, uint8_t cmd, uint8_t arg);
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int8_t (*read)(const i2c_driver* const me, uint8_t cmd_flags, uint8_t* buffer, uint8_t len);
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int8_t (*write)(const i2c_driver* const me, uint8_t cmd_flags, const uint8_t* data, uint8_t len);
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};
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i2c_driver* i2c_open(void);
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void i2c_close(i2c_driver* const me);
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void i2c_reset(void);
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#endif /* I2C_H_ */
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