使用iic的OLED，单总线的DS18B20温度传感器来实时监测温度。

在RTT Studio的软件库下载OLED和DS18B20的包，把domo中的任务创建和入口函数，可以直接拿来使用；

代码上传了gitee：https://gitee.com/sheng_jiancheng/sjc_-prj.git

因为是基本上第一次接触单片机操作系统，所以很fw，下面是主要的几个任务块，我是只有一个18b20的那个黑头头，没有上拉电阻，开始初始化都过不了，直接找不到18B20，后面把驱动ds18b20_connect(rt_base_t pin)函数里面的pin mode改成Pullup可以成功检测到了，但是温度读回来一直都是0，我是废物，没找到原因，后面一定好好查查，如果有大佬看见希望可以指点一哈。我也很懵逼，按道理什么的初始化都成功了，不应该这样。

//线程入口函数：
static void read_temp_entry(void *parameter)
{
    rt_device_t dev = RT_NULL;
    struct rt_sensor_data sensor_data;
    rt_size_t res;

    dev = rt_device_find(parameter);
    if (dev == RT_NULL)
    {
        rt_kprintf("Can't find device:%s\n", parameter);
        return;
    }

    if (rt_device_open(dev, RT_DEVICE_FLAG_RDWR) != RT_EOK)
    {
        rt_kprintf("open device failed!\n");
        return;
    }
    rt_device_control(dev, RT_SENSOR_CTRL_SET_ODR, (void *)100);

    while (1)
    {
        res = rt_device_read(dev, 0, &sensor_data, 1);
        if (res != 1)
        {
            rt_kprintf("read data failed!size is %d\n", res);
            rt_device_close(dev);
            return;
        }
        else
        {
            if (sensor_data.data.temp >= 0)
            {

                temp = (sensor_data.data.temp & 0xffff) >> 5;      // get temp
                rt_kprintf("temp:%3d.%dC, timestamp:%5d\n",
                           sensor_data.data.temp / 10,
                           sensor_data.data.temp % 10,
                           sensor_data.timestamp);
            }
            else
            {
                rt_kprintf("temp:-%2d.%dC, timestamp:%5d\n",
                           abs(sensor_data.data.temp / 10),
                           abs(sensor_data.data.temp % 10),
                           sensor_data.timestamp);
            }
        }
        rt_thread_mdelay(100);
    }
}

//线程创建函数：
static int ds18b20_read_temp_sample(void)
{
    rt_thread_t ds18b20_thread;

    ds18b20_thread = rt_thread_create("18b20tem",
                                      read_temp_entry,
                                      "temp_ds18b20",
                                      1024,
                                      RT_THREAD_PRIORITY_MAX / 2,
                                      20);
    if (ds18b20_thread != RT_NULL)
    {
        rt_thread_startup(ds18b20_thread);
    }

    return RT_EOK;
}
INIT_APP_EXPORT(ds18b20_read_temp_sample);
//DS18B20的初始化
static int rt_hw_ds18b20_port(void)
{
    struct rt_sensor_config cfg;

    cfg.intf.user_data = (void *)DS18B20_DATA_PIN;
    rt_hw_ds18b20_init("ds18b20", &cfg);

    return RT_EOK;
}
INIT_COMPONENT_EXPORT(rt_hw_ds18b20_port);


static void oled_display_entry(void *parameter)
{
    char text[200];
    while(1)
    {
        rt_memset(text, 0, sizeof(text));
        rt_sprintf(text, "%d", temp);
        ssd1306_SetCursor(60, 6);//添加代码，设置显示光标位置
        ssd1306_WriteString(text, Font_11x18, White);//添加代码，设置显示内容
       // ssd1306_UpdateScreen();添加代码，更新显示屏信息

       rt_memset(text, 0, sizeof(text));
       rt_sprintf(text, "%d", humi);
       ssd1306_SetCursor(60, 40);//添加代码，设置显示光标位置
       ssd1306_WriteString(text, Font_11x18, White);//添加代码，设置显示内容
       ssd1306_UpdateScreen();//添加代码，更新显示屏信息
       rt_thread_mdelay(100);
    }
}

void oled_display_thread_create()
{
    rt_thread_t oled_display_thread;
    oled_display_thread = rt_thread_create("oled_display",
                                      oled_display_entry,
                                      RT_NULL,
                                      1024,
                                      20,
                                      40);
    if (oled_display_thread != RT_NULL)
    {
        rt_thread_startup(oled_display_thread);
    }

}

视频演示：