RT-Thread--设备(I2C设备)

最新推荐文章于 2025-01-15 08:28:59 发布

tyustli

最新推荐文章于 2025-01-15 08:28:59 发布

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分类专栏： # RT-Thread 文章标签： RT-Thread 设备 I2C AT24C02

本文链接：https://blog.youkuaiyun.com/tyustli/article/details/89465413

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本文介绍了一个基于RT-Thread操作系统的I2C设备地址扫描程序，该程序通过遍历I2C总线上的地址来查找并打印所有响应的I2C设备地址，适用于I2C设备的快速检测与调试。

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/*
 * Copyright (c) 2006-2020, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author        Notes
 * 2020-09-01     tyustli  first version
 */

#include "rtconfig.h"

#ifdef RT_USING_I2C
#include <rtdevice.h>
#include <rtthread.h>

#define TEST_I2C_BUS  "i2c1"

/*find slave i2c device address*/
static void i2c_find_address(const char *name)
{
    rt_device_t dev;

    dev = rt_device_find(TEST_I2C_BUS);
    if (!dev)
    {
        return;
    }

    if (rt_device_open(dev, RT_DEVICE_OFLAG_RDWR) != RT_EOK)
    {
        return;
    }

    struct rt_i2c_msg msgs[2];
    uint8_t buf = 0;

    msgs[0].flags = RT_I2C_WR;
    msgs[0].buf   = &buf;
    msgs[0].len   = 1;

    msgs[1].flags = RT_I2C_RD;
    msgs[1].buf   = &buf;
    msgs[1].len   = 1;

    for (int i = 0; i <= 0x7f; i++)
    {
        int len;

        msgs[0].addr  = i;
        msgs[1].addr  = i;
        len = rt_i2c_transfer((struct rt_i2c_bus_device *)dev, msgs, 2);
        if (len == 2)
        {
            rt_kprintf("add:0x%x transfer success \r\n", i);
        }
    }

    rt_device_close(dev);

    return;
}

MSH_CMD_EXPORT(i2c_find_address, find i2c address);

#endif /* RT_USING_I2C */

/******************** end of file ****************/