118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
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/*
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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, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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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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#ifndef RT_I2C_NAME_SIZE
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#define RT_I2C_NAME_SIZE 32
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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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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_hardware_info {
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char name[RT_I2C_NAME_SIZE];
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rt_uint16_t flags;
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rt_uint16_t addr;
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rt_uint32_t bus_id;
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rt_list_t list;
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};
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#define RT_I2C_HARDWARE_INFO(name, flags, addr, bus_id) \
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name,flags,addr,bus_id,{RT_NULL,RT_NULL}
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struct rt_i2c_bus;
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struct rt_i2c_bus_ops {
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rt_size_t (*master_xfer) (struct rt_i2c_bus *bus, struct rt_i2c_msg *msgs, rt_uint32_t num);
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rt_size_t (*slave_xfer) (struct rt_i2c_bus *bus, struct rt_i2c_msg *msgs, rt_uint32_t num);
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rt_err_t (*i2c_bus_control) (struct rt_i2c_bus *bus, rt_uint32_t, rt_uint32_t);
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};
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/*for i2c bus driver*/
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struct rt_i2c_bus {
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struct rt_device *parent;
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char name[RT_I2C_NAME_SIZE];
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rt_uint32_t id;
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const struct rt_i2c_bus_ops *ops;
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struct rt_mutex lock;
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rt_list_t devices;
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rt_list_t list;
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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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struct rt_i2c_device;
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struct rt_i2c_driver {
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char name[RT_I2C_NAME_SIZE];
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rt_err_t (*probe)(struct rt_i2c_device *device);
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rt_err_t (*remove)(struct rt_i2c_device *device);
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rt_list_t devices;
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};
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/*for i2c device driver*/
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struct rt_i2c_device {
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rt_uint32_t flags;
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rt_uint16_t addr;
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struct rt_i2c_bus *bus;
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struct rt_i2c_driver *driver;
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struct rt_device dev;
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rt_list_t drv_list;
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rt_list_t bus_list;
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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_register(struct rt_i2c_bus *bus);
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rt_err_t rt_i2c_bus_unregister(struct rt_i2c_bus *bus);
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void rt_i2c_hw_info_register(struct rt_i2c_hardware_info *info, rt_uint32_t size);
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rt_err_t rt_i2c_bus_attach_driver(struct rt_i2c_driver *driver);
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rt_err_t rt_i2c_bus_detach_driver(struct rt_i2c_driver *driver);
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rt_size_t rt_i2c_transfer(struct rt_i2c_bus *bus,
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struct rt_i2c_msg *msgs, rt_uint32_t size);
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rt_size_t rt_i2c_master_send(struct rt_i2c_device *device,
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const rt_uint8_t *buf, rt_uint32_t size);
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rt_size_t rt_i2c_master_recv(struct rt_i2c_device *device,
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rt_uint8_t *buf ,rt_uint32_t size);
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rt_err_t rt_i2c_core_init();
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#ifdef __cplusplus
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}
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#endif
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#endif
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