RT-Thread-[第二期空气质量分析仪]第2周作业RT-Thread问答社区

[第二期空气质量分析仪]第2周作业

发布于 2019-09-06 22:59:20 浏览：851 订阅该版

任务1：完成温湿度应用模块

```static rt_thread_t temp_humi_thread = RT_NULL;//线程控制块
static void temp_humi_thread_entry(void* parameter)
{
    while (1)
    {
        rt_kprintf("temp_humi_thread running: ");

//read humidity
        g_humidity = aht10_read_humidity(dev);
        rt_kprintf("humidity:%d.%d%%; ", (int)g_humidity, (int)(g_humidity * 10) % 10);

//read temperature
        g_temperature = aht10_read_temperature(dev);
        rt_kprintf("temperature:%d.%d℃; <br>", (int)g_temperature, (int)(g_temperature * 10) % 10);

rt_thread_delay(500);
    }
}

void temp_humi_init(void)
{
    const char *i2c_bus_name = "i2c2";

dev = aht10_init(i2c_bus_name);
    if(dev == RT_NULL)
    {
        rt_kprintf("The sensor initializes failure <br>");
    }

// 创建动态线程
    temp_humi_thread =
    rt_thread_create("temp_humi_thread",            //线程名字，在shell里面可以看到
                    temp_humi_thread_entry,         //线程入口函数
                    RT_NULL,                        //线程入口函数参数
                    512,                            //线程栈大小
                    3,                              //线程的优先级
                    20);                            //线程时间片
    if (temp_humi_thread != RT_NULL)
        rt_thread_startup(temp_humi_thread);        //启动线程
    else
        return;

}
```

任务2：PM2.5传感器驱动

```static rt_thread_t pm2_5_thread = RT_NULL;//线程控制块
static void pm2_5_thread_entry(void* parameter)
{
    uint8_t VoutH = 0, VoutL = 0;
    uint8_t VrefH = 0, VrefL = 0;
    uint8_t Checksum = 0;

//Vout = (VoutH * 256 + VoutL) / 1024 * 5V;
    //Sensitivity = 0.35V/(0.1mg/m^3) = 0.0035V/(ug/m^3)
    //ratio = 5 / (1024 * 0.0035)

float ratio = 5 / (1024 * 0.0035);

while(1)
    {
        if (g_UART_FrameFlag == 0)
            return;

rt_kprintf("pm2_5_thread running: ");

VoutH = g_UART_FrameBuf[1];
        VoutL = g_UART_FrameBuf[2];
        VrefH = g_UART_FrameBuf[3];
        VrefL = g_UART_FrameBuf[4];
        Checksum = g_UART_FrameBuf[5];

if (Checksum == (VoutH + VoutL + VrefH + VrefL))
        {
            g_pm2_5 = (VoutH * 256 + VoutL) * ratio;
            rt_kprintf("pm2.5:%dug/m^3; <br>", (int)g_pm2_5);
        }

rt_thread_delay(500);
    }
}

void pm2_5_init(void)
{
    //init

// 创建动态线程
    pm2_5_thread =
    rt_thread_create("pm2_5_thread",                //线程名字，在shell里面可以看到
                    pm2_5_thread_entry,             //线程入口函数
                    RT_NULL,                        //线程入口函数参数
                    512,                            //线程栈大小
                    4,                              //线程的优先级
                    20);                            //线程时间片
    if (pm2_5_thread != RT_NULL)
        rt_thread_startup(pm2_5_thread);            //启动线程
    else
        return;

}
```

实验结果：
![12334.jpg](/uploads/201909/06/225607vjemozeilvme4xjv.jpg)

没有买甲醛模块，任务3没有做。

中间遇到个小问题，pm2_5_thread的优先级低于temp_humi_thread的优先级或两者优先级相同时，temp_humi_thread打印消息会打断pm2_5_thread的消息，将pm2_5_thread设为高于temp_humi_thread优先级时就正常了，还没找到是什么原因。