osd-contiki/platform/osd-merkur/dev/i2c.h
2014-06-21 21:30:48 +02:00

132 lines
4.6 KiB
C

/*
* Copyright (c) 2014, Ingo Gulyas Intembsys
* All rights reserved.
*
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* I2C driver for ATMEGA128rfa1
*
* \author
* Ingo Gulyas Intembsys
* office@intembsys.at
* www.intembsys.at
*/
#ifndef I2C_H_
#define I2C_H_
#include <stdint.h>
////////////////////////////////////////////////////////////////////////////////////////////
// CONFIGURATION SECTION:
#define I2C_TD 0 // compiler switch: i2c testdriver code
#define I2C_PORT PORTD
#define I2C_DDR DDRD
#define I2C_SCL_PIN 0
#define I2C_SDA_PIN 1
// END OF CONFIGURATION SECTION
////////////////////////////////////////////////////////////////////////////////////////////
#define I2C_INIT() ({I2C_DDR &= ~((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN)); I2C_PORT |= ((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN));})
#define I2C_DEINIT() ({I2C_DDR &= ~((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN)); I2C_PORT |= ((1<<I2C_SCL_PIN) | (1<<I2C_SDA_PIN));})
#define I2C_FREQ_STANDARD I2C_FREQ_50KHZ
#if F_CPU == 16000000UL
#define I2C_FREQ_400KHZ 0x03
#define I2C_FREQ_250KHZ 0x06
#define I2C_FREQ_100KHZ 0x12
#define I2C_FREQ_50KHZ 0x26
#define I2C_FREQ_10KHZ 0xC6
#else
#error "NO I2C FREQUENCY DEFINED -> CHECK F_CPU SETTINGS!"
#endif
#define I2C_STATUS_REG TWSR
#define I2C_TX_REG TWDR
#define I2C_RX_REG TWDR
#define I2C_START() (TWCR = (1<<TWINT) |(1<<TWSTA) | (1<<TWEN))
#define I2C_STOP() (TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO))
#define I2C_WRITE_BYTE() (TWCR = (1<<TWINT) | (1<<TWEN))
#define I2C_READ_BYTE_ACK() (TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA))
#define I2C_READ_BYTE_NACK() (TWCR = (1<<TWINT) | (1<<TWEN))
#define I2C_STATUS() (I2C_STATUS_REG & I2C_STATUS_MASK)
#define I2C_STATUS_MASK 0xF8
#define I2C_STATUS_START 0x08
#define I2C_STATUS_START_REP 0x10
#define I2C_STATUS_SLAW_ACK 0x18
#define I2C_STATUS_DATAW_ACK 0x28
#define I2C_STATUS_SLAR_ACK 0x40
#define I2C_STATUS_DATAR_ACK 0x50
#define I2C_STATUS_DATAR_NACK 0x58
#define I2C_ADR_WR(adr) ((adr<<1) & ~(1<<0))
#define I2C_ADR_RD(adr) ((adr<<1) | (1<<0))
#define I2C_CMD_FLAG_NONE 0x00
#define I2C_CMD_FLAG_START (1<<0)
#define I2C_CMD_FLAG_STOP (1<<1)
#define I2C_OK 0
#define I2C_ERROR_DRIVER -1
#define I2C_ERROR_TIMEOUT -2
#define I2C_ERROR_START -3
#define I2C_ERROR_WRITE -4
#define I2C_ERROR_READ -5
#define I2C_IOCTL_CMD_SET_FREQ 0x01
typedef struct i2c_driver i2c_driver;
struct i2c_driver
{
int8_t (*ioctl)(const i2c_driver* const me, uint8_t cmd, uint8_t arg);
int8_t (*read)(const i2c_driver* const me, uint8_t cmd_flags, uint8_t* buffer, uint8_t len);
int8_t (*write)(const i2c_driver* const me, uint8_t cmd_flags, const uint8_t* data, uint8_t len);
};
i2c_driver* i2c_open(void);
void i2c_close(i2c_driver* const me);
void i2c_reset(void);
#endif /* I2C_H_ */