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 2019-10-24 20:32:58 浏览：741 订阅该版

* 本帖最后由 波尔顿 于 2019-10-23 10:01 编辑 *

实现任务1：温湿度应用模块
借用DHT11驱动包里的应用模块代码
```void temp_humi_entry(void *parameter)
{
    rt_device_t dev = RT_NULL;
    struct rt_sensor_data sensor_data;
    rt_size_t res;
    rt_uint8_t get_data_freq = 1; /* 1Hz */

dev = rt_device_find("temp_dht11");
    if (dev == RT_NULL)
    {
        return;
    }

if (rt_device_open(dev, RT_DEVICE_FLAG_RDWR) != RT_EOK)
 {
 rt_kprintf("open device failed! ");
 return;
 }

rt_device_control(dev, RT_SENSOR_CTRL_SET_ODR, (void *)(&get_data_freq));

while (1)
    {
        res = rt_device_read(dev, 0, &sensor_data, 1);

if (res != 1)
 {
 rt_kprintf("read data failed! result is %d ", res);
 rt_device_close(dev);
 return;
 }
 else
 {
 if (sensor_data.data.temp >= 0)
 {
 uint8_t temp = (sensor_data.data.temp & 0xffff) >> 0; // get temp
 uint8_t humi = (sensor_data.data.temp & 0xffff0000) >> 16; // get humi
 rt_kprintf("temp:%d, humi:%d " ,temp, humi);
 }
 }
 rt_thread_delay(1000);
 }
}
uint8_t temp_humi_init(void)
{
 struct rt_sensor_config cfg;
 
 cfg.intf.user_data = (void *)DHT11_DATA_PIN;
 rt_hw_dht11_init("dht11", &cfg);
 
 rt_thread_t dht11_thread;

dht11_thread = rt_thread_create("dht_tem",
                                     temp_humi_entry,
                                     RT_NULL,
                                     1024,
                                     RT_THREAD_PRIORITY_MAX / 2,
                                     20);
    if (dht11_thread != RT_NULL)
    {
        rt_thread_startup(dht11_thread);
    }
   return RT_EOK;     
}```
实现任务2：PM2.5
[indent]2.1 PM2.5 驱动模块[/indent][indent]```float gp2y_read_pm25(void)
{
    rt_adc_device_t adc_dev;
    rt_uint32_t value, vol, dust;
//    rt_err_t ret = RT_EOK;

/* 查找设备 */
 adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
 if (adc_dev == RT_NULL)
 {
 rt_kprintf("adc sample run failed! can't find %s device! ", ADC_DEV_NAME);
 // return RT_ERROR;
 }

/* 使能设备 */
    rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);
        
        rt_pin_write(GP2Y_DATA_PIN, PIN_LOW);
    rt_hw_us_delay(280);

/* 读取采样值 */
 value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
 rt_kprintf(" the value is :%d ", value);
 
 rt_hw_us_delay(40);
 rt_pin_write(GP2Y_DATA_PIN, PIN_HIGH);
 
 rt_hw_us_delay(680);

/* 转换为对应电压值 */
 // vol = value * REFER_VOLTAGE / CONVERT_BITS;
 vol = value * 5 / 1024 *1000;
 //rt_kprintf("the voltage is :%d.%02d ", vol / 100, vol % 100);
 
 dust = 0.17 * vol - 0.1;
 
 /* 关闭通道 */
 //ret = rt_adc_disable(adc_dev, ADC_DEV_CHANNEL);

return dust;
}```
[/indent][indent]2.2 PM2.5 应用模块[/indent][indent]```void pm25_entry(void *parameter)
{
 int pm25_value;
 while(1)
 { 
 pm25_value = gp2y_read_pm25( );
 rt_kprintf(" pm2.5 : %d mg/m3 ",pm25_value);
 rt_thread_delay(1000);
 }
 
} 
uint8_t pm25_init(void)
{
 //gp2y_hw_init();
 rt_thread_t pm25_thread;
 
 pm25_thread = rt_thread_create("pm25",
 pm25_entry,
 RT_NULL,
 1024,
 RT_THREAD_PRIORITY_MAX / 2 +1,
 20);
 if (pm25_thread != RT_NULL)
 {
 rt_thread_startup(pm25_thread);
 }
 return RT_EOK;
}```
[/indent][indent]
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