mirror of
https://github.com/RT-Thread/rt-thread.git
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105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* Copyright (c) 2006-2023, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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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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* 2021-04-20 RiceChen added support for bus control api
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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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#define RT_I2C_NO_STOP (1u << 7)
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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_ssize_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_ssize_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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int cmd,
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void *args);
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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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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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struct rt_i2c_client
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{
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struct rt_i2c_bus_device *bus;
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rt_uint16_t client_addr;
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};
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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_ssize_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_err_t rt_i2c_control(struct rt_i2c_bus_device *bus,
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int cmd,
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void *args);
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rt_ssize_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_ssize_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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rt_inline rt_err_t rt_i2c_bus_lock(struct rt_i2c_bus_device *bus, rt_tick_t timeout)
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{
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return rt_mutex_take(&bus->lock, timeout);
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}
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rt_inline rt_err_t rt_i2c_bus_unlock(struct rt_i2c_bus_device *bus)
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{
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return rt_mutex_release(&bus->lock);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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