106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*
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* File : i2c.h
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2012-04-25 weety first version
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*/
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#ifndef __I2C_H__
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#define __I2C_H__
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#include <rtthread.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RT_I2C_WR 0x0000
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#define RT_I2C_RD (1u << 0)
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#define RT_I2C_ADDR_10BIT (1u << 2) /* this is a ten bit chip address */
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#define RT_I2C_NO_START (1u << 4)
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#define RT_I2C_IGNORE_NACK (1u << 5)
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#define RT_I2C_NO_READ_ACK (1u << 6) /* when I2C reading, we do not ACK */
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struct rt_i2c_msg
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{
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rt_uint16_t addr;
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rt_uint16_t flags;
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rt_uint16_t len;
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rt_uint8_t *buf;
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};
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struct rt_i2c_bus_device;
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struct rt_i2c_bus_device_ops
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{
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rt_size_t (*master_xfer)(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[],
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rt_uint32_t num);
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rt_size_t (*slave_xfer)(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[],
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rt_uint32_t num);
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rt_err_t (*i2c_bus_control)(struct rt_i2c_bus_device *bus,
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rt_uint32_t,
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rt_uint32_t);
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};
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/*for i2c bus driver*/
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struct rt_i2c_bus_device
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{
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struct rt_device parent;
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const struct rt_i2c_bus_device_ops *ops;
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rt_uint16_t flags;
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rt_uint16_t addr;
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struct rt_mutex lock;
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rt_uint32_t timeout;
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rt_uint32_t retries;
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void *priv;
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};
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#ifdef RT_I2C_DEBUG
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#define i2c_dbg(fmt, ...) rt_kprintf(fmt, ##__VA_ARGS__)
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#else
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#define i2c_dbg(fmt, ...)
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#endif
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rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus,
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const char *bus_name);
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struct rt_i2c_bus_device *rt_i2c_bus_device_find(const char *bus_name);
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rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[],
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rt_uint32_t num);
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rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus,
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rt_uint16_t addr,
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rt_uint16_t flags,
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const rt_uint8_t *buf,
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rt_uint32_t count);
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rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus,
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rt_uint16_t addr,
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rt_uint16_t flags,
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rt_uint8_t *buf,
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rt_uint32_t count);
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int rt_i2c_core_init(void);
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#ifdef __cplusplus
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}
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#endif
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#endif
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