RT-Thread-[第3期空气质量分析仪]第二周作业--砍柴人三号RT-Thread问答社区

[第3期空气质量分析仪]第二周作业--砍柴人三号

发布于 2019-10-25 23:32:26 浏览：698 订阅该版

**第3期 空气质量分析仪]第二周作业**一、      温湿度应用任务实现        在application文件下新建temp_humi_th.c和temp_humi_th.h，并在keil工程中的Applictions目录下添加temp_humi_th.c文件。代码如下：

```rt_thread_t temp_humi_thread;
aht10_device_t aht10_dev;

void temp_humi_entry(void *parameter)
{
 float humi, temp;
 char buf[128];
 temp = aht10_read_temperature(aht10_dev);
 sprintf(buf, "Temperature: %0.2f °C ", temp);
 rt_kprintf(buf);
 humi = aht10_read_humidity(aht10_dev);
 sprintf(buf, "Humidity: %0.2f ", humi);
 rt_kprintf(buf);
 rt_thread_mdelay(2000);
}

void temp_humi_init(void)
{ 
 aht10_device_t aht10_dev;
 rt_thread_mdelay(10000);
 aht10_dev = aht10_init("i2c1");
 if(aht10_dev == RT_NULL)
 {
 rt_kprintf("The temperature and humidity sensor initializes failure! ");
 }
 temp_humi_thread = rt_thread_create("temp_humi",
 temp_humi_entry,
 RT_NULL,
 1024,
 5,
 20);
 if(temp_humi_thread != RT_NULL)
 {
 rt_thread_startup(temp_humi_thread);
 }
}
```
二、 PM2.5任务实现选用的是GP2Y1026AU0F型号PM2.5传感器，传感器采用2400波特率的串口传输数据。数据由7个字节组成：[table=98%]
[tr][td=89] 开始位 [/td][td=89]Vout(H)[/td][td=87]Vout(L)[/td][td=86]Vref(H)[/td][td=84]Vref(L)[/td][td=102]CheckSum[/td][td=88]结束位[/td][/tr]
[tr][td=89] 0xaa [/td][td=89]0-0xff[/td][td=87]0-0xff[/td][td=86]0-0xff[/td][td=84]0-0xff[/td][td=102]0-0xff[/td][td=88]0xff[/td][/tr]
[/table]
CheckSum = Vout(H) + Vout(L) + Vref(H) +Vref(L)Vout = (Vout(H)*256 + Vout(L))/1024 * 5 (V)Dust_density = Vout * 0.35 (mg/m^3)例如：Vout(H)= 1，Vout(L)= 58时Vout = (1*256+58)/1024*5 = 1.533 VDust density = 1.533*0.35 = 0.5366 mg/m^3
由于采用串口通信，不用重新写驱动，直接从软件包选择UART1驱动。在application文件下新建pm25_th.c和pm25_th.h，并在keil工程中的Applictions目录下添加pm25_th.c文件。代码如下：
```#define PM25_UART_NAME "uart1" /* 串口设备名称 */
static rt_device_t pm25_serial; /* 串口设备句柄 */
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT; /* 初始化配置参数 */
static struct rt_semaphore pm25_rx_sem; /* 用于接收消息的信号量 */
rt_thread_t pm25_thread;

void pm25_init(void)
{   
    /* step1：查找串口设备 */
    pm25_serial = rt_device_find(PM25_UART_NAME);

/* step2：打开串口设备。以中断接收及轮询发送模式打开串口设备 */
    rt_device_open(pm25_serial, RT_DEVICE_FLAG_INT_RX);
    //rt_device_open(pm25_serial, RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_DMA_RX);

/* step3：修改串口配置参数 */
    config.baud_rate = BAUD_RATE_2400;        //2400波特率
    config.data_bits = DATA_BITS_8;           //数据位 8
    config.stop_bits = STOP_BITS_2;           //停止位 2
    config.parity = PARITY_NONE;              //无奇偶校验位

/* step4：控制串口设备。通过控制接口传入命令控制字，与控制参数 */
    rt_device_control(pm25_serial, RT_DEVICE_CTRL_CONFIG, &config);
    
    pm25_thread = rt_thread_create("gp2y_pm25",
                                    pm25_entry,
                                    RT_NULL,
                                    1024,
                                    3,
                                    20);
    if(pm25_thread != RT_NULL)
    {
        rt_thread_startup(pm25_thread);
    }
}

static rt_err_t uart1_input(rt_device_t dev, rt_size_t size)
{
    rt_sem_release(&pm25_rx_sem);
    return RT_EOK;
}

void pm25_entry(void *parameter)
{
   unsigned char data[7] = {0};
   char buf[64];
   unsigned char i = 0;
   unsigned char temp;
   float dust_density = 0.0, Vout =0.0;
   
   /* 初始化信号量 */
   rt_sem_init(&pm25_rx_sem, "pm25_rx_sem", 0, RT_IPC_FLAG_FIFO);
   rt_device_set_rx_indicate(pm25_serial,uart1_input);

while (1)
 {
 while (rt_device_read(pm25_serial, -1, &temp, 1) != 1)
 {
 /* 阻塞等待接收信号量，等到信号量后再次读取数据 */
 rt_sem_take(&pm25_rx_sem, RT_WAITING_FOREVER);
 }
 if(temp == 0xaa)
 {
 i = 0;
 for(i = 0; i < 6; i++)
 {
 /* 从串口读取一个字节的数据，没有读取到则等待接收信号量 */
 while (rt_device_read(pm25_serial, -1, &data*, 1) != 1)
 {
 /* 阻塞等待接收信号量，等到信号量后再次读取数据 */
 rt_sem_take(&pm25_rx_sem, RT_WAITING_FOREVER);
 }
 if(i == 5)
 {
 rt_kprintf("PM2.5 UART1 Data: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x ", 0xaa,data[0],data[1],data[2],data[3],data[4],data[5]);
 if((data[5] == 0xff) && (data[0]+data[1]+data[2]+data[3] == data[4])) //判读接受到的数据是否符合要求，第7个字节为0xff, 第6个字节为第2-5字节的和
 {
 Vout = (float)(((float)data[0]*256 + data[1])/(1024))*5; //计算电压值
 dust_density = Vout*0.35f; //计算PM2.5值，单位mg/m^3
 sprintf(buf, "PM2.5:%0.4f mg/m^3 , Voltage: %0.4f V ", dust_density, Vout);
 rt_kprintf(buf);
 }
 else
 {
 rt_kprintf("PM2.5 data error! ");
 }
 }
 }
 
 } 
 rt_thread_mdelay(1000);
 }
}
```
 为了解决在evn中menuconfig后会移除temp_humi_th.c和pm25_th.c，需要修改application目录下的Sconscript，修改后文件如下：```import rtconfig

from building import *

cwd     = GetCurrentDir()

CPPPATH = [cwd, str(Dir('#'))]

src     = Split("""

main.c

temp_humi_th.c

pm25_th.c

""")

group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)

Return('group')
```

main.c代码如下：
```#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>
#include <led_alert.h>
#include <key.h>
#include <aht10.h>
#include <sensor_asair_aht10.h>
#include <pm25_th.h>
#include <temp_humi_th.h>

int main(void)
{   
    temp_humi_init();
    pm25_init();
    return RT_EOK;
}```

三、运行结果
        论坛帖子提交不了图片，复制运行结果如下：

```Temperature: 25.50 °C
Humidity: 29
PM2.5 UART1 Data: 0xaa 0x00 0x98 0x00 0x51 0xe9 0xff
PM2.5:0.2598 mg/m^3 , Voltage: 0.7422 V
PM2.5 UART1 Data: 0xaa 0x00 0x98 0x00 0x51 0xe9 0xff
PM2.5:0.2598 mg/m^3 , Voltage: 0.7422 V
Temperature: 25.50 °C
Humidity: 29
PM2.5 UART1 Data: 0xaa 0x00 0x98 0x00 0x51 0xe9 0xff
PM2.5:0.2598 mg/m^3 , Voltage: 0.7422 V
PM2.5 UART1 Data: 0xaa 0x00 0x98 0x00 0x51 0xe9 0xff
PM2.5:0.2598 mg/m^3 , Voltage: 0.7422 V
Temperature: 25.50 °C
Humidity: 29
PM2.5 UART1 Data: 0xaa 0x00 0x91 0x00 0x51 0xe2 0xff
PM2.5:0.2478 mg/m^3 , Voltage: 0.7080 V
PM2.5 UART1 Data: 0xaa 0x00 0x91 0x00 0x51 0xe2 0xff
PM2.5:0.2478 mg/m^3 , Voltage: 0.7080 V
Temperature: 25.50 °C
Humidity: 29
PM2.5 UART1 Data: 0xaa 0x00 0x91 0x00 0x51 0xe2 0xff
PM2.5:0.2478 mg/m^3 , Voltage: 0.7080 V
PM2.5 UART1 Data: 0xaa 0x00 0x91 0x00 0x51 0xe2 0xff
PM2.5:0.2478 mg/m^3 , Voltage: 0.7080 V
```