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121 lines
2.2 KiB
C
121 lines
2.2 KiB
C
/*
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* Copyright (c) 2006-2018, 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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* 2017-09-06 勤为本 first version
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*/
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// 硬件i2c接口的头文件
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#ifndef __OPENLOONGSON_I2C_H
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#define __OPENLOONGSON_I2C_H
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// I2C的时钟频率
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#define LS1C_I2C_CLOCK_DEFAULT (100000) // Hz. 默认频率
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#define LS1C_I2C_CLOCK_MAX (400000) // Hz, max 400 Kbits/sec
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// I2C模块编号
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typedef enum
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{
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LS1C_I2C_0 = 0,
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LS1C_I2C_1,
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LS1C_I2C_2
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}ls1c_i2c_t;
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// I2C数据传输方向
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typedef enum
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{
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LS1C_I2C_DIRECTION_WRITE = 0, // 主机向从机写信息
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LS1C_I2C_DIRECTION_READ, // 主机向从机读信息
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}ls1c_i2c_direction_t;
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// 硬件I2C信息
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typedef struct
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{
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ls1c_i2c_t I2Cx; // i2c模块编号
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unsigned long clock; // i2c时钟频率，单位hz
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}ls1c_i2c_info_t;
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// I2C应答
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typedef enum
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{
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LS1C_I2C_ACK = 0, // 收到应答
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LS1C_I2C_NACK = 1, // 没收到应答
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}ls1c_i2c_ack_t;
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// 函数返回值
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typedef enum
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{
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LS1C_I2C_RET_OK = 0, // OK
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LS1C_I2C_RET_TIMEOUT, // 超时
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}ls1c_i2c_ret_t;
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/*
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* 初始化指定i2c模块
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* @i2c_info_p 某个i2c模块的信息
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*/
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void i2c_init(ls1c_i2c_info_t *i2c_info_p);
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/*
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* (再发送一个字节数据之后)接收从机发送的ACK信号
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* @i2c_info_p i2c模块信息
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* @ret LS1C_I2C_ACK or LS1C_I2C_NACK
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*/
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ls1c_i2c_ack_t i2c_receive_ack(ls1c_i2c_info_t *i2c_info_p);
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/*
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* 接收数据
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* @i2c_info_p i2c模块信息
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* @buf 数据缓存
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* @len 待接收数据的长度
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*/
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ls1c_i2c_ret_t i2c_receive_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *buf, int len);
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/*
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* 发送START信号和地址
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* @i2c_info_p i2c模块信息
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* @slave_addr 从机地址
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* @direction 数据传输方向(读、写)
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*/
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ls1c_i2c_ret_t i2c_send_start_and_addr(ls1c_i2c_info_t *i2c_info_p,
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unsigned char slave_addr,
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ls1c_i2c_direction_t direction);
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/*
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* 发送数据
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* @i2c_info_p i2c模块信息
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* @data 待发送的数据
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* @len 待发送数据的长度
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*/
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ls1c_i2c_ret_t i2c_send_data(ls1c_i2c_info_t *i2c_info_p, unsigned char *data, int len);
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/*
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* 发送STOP信号
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* @i2c_info_p i2c模块信息
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*/
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void i2c_send_stop(ls1c_i2c_info_t *i2c_info_p);
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#endif
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