RT-Thread-CPK-RA2L1评估板（5）室内空气质量监测系统RT-Thread问答社区

CPK-RA2L1评估板（5）室内空气质量监测系统

发布于 2023-03-12 20:59:29 浏览：384 订阅该版

[tocm]

# 一、背景
有幸参加RT-Thread的活动，体验RT-Thread Studio 和瑞萨 CPK-RA2L1评估板。本篇结合前面的文章，暂时制作一个空气质量监测系统，主要使用：DHT11、PMS1003, OLED模块， 后续继续扩展甲醛，CO2, IAQ模块

# 二、模块信息
目前使用的三个模块的相关信息，参考：[https://club.rt-thread.org/u/4b47abf4107e49c9/article.html](https://club.rt-thread.org/u/4b47abf4107e49c9/article.html)

# 三、新建工程
这里使用的模块，我们需要提前分配好引脚：UART0 采集PMS1003, DHT11 使用P0208 引脚， OLED I2C1通信 使用P0205 P0206,
 配置RT-Thread Settings ，添加u8g2 库，配置i2c,具体信息如下图
 
![1.png](https://oss-club.rt-thread.org/uploads/20230312/d6468f4982a8ecff1d5b8c67e59af1c2.png.webp)
 
 
![2.png](https://oss-club.rt-thread.org/uploads/20230312/0a40d2ba8fb099fde9dec2bc938f177b.png.webp)

![3.png](https://oss-club.rt-thread.org/uploads/20230312/09f99e9105283b058398c8d836c3d319.png.webp)

在 RA Smart Configurator 种添加UART0，配置好引脚和波特率

![4.png](https://oss-club.rt-thread.org/uploads/20230312/82d2be960d0e22aadcee3c314f5a1f56.png)

在 RA Smart Configurator 种添加I2C1

![5.png](https://oss-club.rt-thread.org/uploads/20230312/6ec2f2310fa0d391d1355d013cb62864.png)

四、编写代码

hal_entery.c
```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author        Notes
 * 2021-10-10     Sherman       first version
 */
#include <rtthread.h>
#include "hal_data.h"
#include <rtdevice.h>
#include "dht11.h"
#include <rtdbg.h>
#include "pms1003.h"

#include <string.h>
#include <rthw.h>
#include <u8g2_port.h>

//#define DBG_ENABLE
//#define DBG_SECTION_NAME "pms_series"
//#define DBG_LEVEL DBG_LOG
//#define DBG_COLOR
//#define DBG_ENABLE

#define LED1_PIN    "P502" /* Onboard LED pins */
#define USER_INPUT  "P004"

/******** DHT11 *********/
#define DATA_PIN                0x0208 //P208 dht11
#define THREAD_PRIORITY         5
#define THREAD_STACK_SIZE       1024
#define THREAD_TIMESLICE        10
static rt_thread_t tid_dht11 = RT_NULL;

/******** PMS1003 *********/
//tx P101    rx P100
#define PMS_SERIES_UART       "uart0"

#ifdef PMS_SERIES_SAMPLE_USING_DMA
struct rt_messagequeue pms_mq;
#else
struct rt_semaphore pms_sem;
#endif
pms_device_t PMS1003;
struct rx_msg
{
    rt_device_t dev;
    rt_size_t size;
};

/******** OLED *********/
static rt_thread_t tid_oled = RT_NULL;

int temp = 0;
int humi = 0;
int PM2_5 = 0;
int PM10 = 0;

static void Dht11ThreadEntry(void *parameter)
{
    dht_device_t sensor = dht_create(DATA_PIN);
    rt_int32_t temp_;
    rt_int32_t humi_;

while (1)
    {
        if(dht_read(sensor))
        {
             temp_ = dht_get_temperature(sensor) / 10;
             humi_ = dht_get_humidity(sensor) / 10;
             temp = temp_;
             humi = humi_;
//            rt_kprintf("Temp: %d, Humi: %d\n", temp, humi);
        }
        else
        {
//            rt_kprintf("Read dht sensor failed.\n");
        }
        rt_thread_mdelay(500);
    }

dht_delete(sensor);
}

int dht11_init()
{
    rt_err_t ret = RT_EOK;

tid_dht11 = rt_thread_create("dht11",
                            Dht11ThreadEntry,
                            RT_NULL,
                            THREAD_STACK_SIZE,
                            THREAD_PRIORITY,
                            THREAD_TIMESLICE);

if (tid_dht11 != RT_NULL)
    {
        rt_thread_startup(tid_dht11);
    }
    else
    {
        ret = RT_ERROR;
    }

return ret;
}
//INIT_APP_EXPORT(dht11_init);

void pms_series_debug(pms_device_t dev)
{
    rt_kprintf("*********************************begin***********************************\n");
    rt_kprintf("PM1_0_CF1 = %5d\tPM2_5_CF1 = %5d\tPM10_0_CF1 = %5d\n",dev->PM1_0_CF1,dev->PM2_5_CF1,dev->PM10_0_CF1);
    rt_kprintf("PM1_0_amb = %5d\tPM2_5_amb = %5d\tPM10_0_amb = %5d\n",dev->PM1_0_amb,dev->PM2_5_amb,dev->PM10_0_amb);

rt_kprintf("air_0_3um = %5d\tair_0_5um = %5d\tair_1_0um  = %5d\n",dev->air_0_3um,dev->air_0_5um,dev->air_1_0um);
    rt_kprintf("air_2_5um = %5d\t",dev->air_2_5um);

rt_kprintf("version   = %5d                    errorCode = %5d\n",dev->version,dev->errorCode);
    rt_kprintf("********************************over*************************************\n");
}

static void serial_thread_entry(void *parameter)
{
#ifndef PMS_SERIES_SAMPLE_USING_DMA
    rt_err_t result;
    char ch;
    pms_device_t dev = parameter;

while (1)
    {
        while (rt_device_read(dev->serial, 0, &ch, 1) == 0)
        {
            rt_sem_control(&pms_sem, RT_IPC_CMD_RESET, RT_NULL);
            rt_sem_take(&pms_sem, RT_WAITING_FOREVER);
        }
        result = pms_get_byte(dev,ch);
        if (result == RT_EOK)
        {
//            pms_series_debug(dev); // for debug
              PM2_5 = dev->PM2_5_CF1;
              PM10 = dev->PM10_0_CF1;
//            rt_kprintf("air_2_5um = %d\n",PM2_5);
        }
    }
#endif

#ifdef PMS_SERIES_SAMPLE_USING_DMA
    struct rx_msg msg;
    rt_err_t result;
    rt_uint32_t rx_length;
    static rt_uint8_t rx_buffer[RT_SERIAL_RB_BUFSZ + 1];

pms_device_t dev = parameter;

while (1)
    {
        rt_memset(&msg, 0, sizeof(msg));
        result = rt_mq_recv(&pms_mq, &msg, sizeof(msg), RT_WAITING_FOREVER);
        if (result == RT_EOK)
        {
            rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
            rx_buffer[rx_length] = '\0';
            result = frame_check(dev,rx_buffer,rx_length);
            if (result == RT_EOK)
            {
                pms_series_debug(dev);
                rt_kprintf("rx buff success");
            }
            else
            {
                rt_kprintf("rx buff error");
            }
        }
    }
#endif
}

static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
{
    RT_ASSERT(dev);
#ifndef PMS_SERIES_SAMPLE_USING_DMA
    if (size > 0)
    {
        rt_sem_release(&pms_sem);
    }
    return RT_EOK;
#endif

#ifdef PMS_SERIES_SAMPLE_USING_DMA
    rt_err_t result;
    struct rx_msg msg;
    msg.dev = dev;
    msg.size = size;

result = rt_mq_send(&pms_mq, &msg, sizeof(msg));
    if ( result == -RT_EFULL)
    {
        rt_kprintf("message queue full！\n");
    }
    return result;
#endif
}

int PMS1003Init()
{
    static pms_device_t dev = NULL;
    rt_err_t ret = RT_EOK;
    dev = pms_init(PMS_SERIES_UART);
#ifndef PMS_SERIES_SAMPLE_USING_DMA
    rt_sem_init(&pms_sem, "pms_sem", 0, RT_IPC_FLAG_FIFO);

rt_device_open(dev->serial, RT_DEVICE_FLAG_INT_RX);

rt_device_set_rx_indicate(dev->serial, uart_input);
#endif
#ifdef  PMS_SERIES_SAMPLE_USING_DMA
    static char msg_pool[256];
    rt_err_t result;
    result = rt_mq_init(&pms_mq, "pms_mq",
               msg_pool,
               sizeof(struct rx_msg),
               sizeof(msg_pool),
               RT_IPC_FLAG_FIFO);
    if (result != RT_EOK)
    {
        rt_kprintf("init message queue failed.\n");
    }
    result = rt_device_open(dev->serial, RT_DEVICE_FLAG_DMA_RX);
    if (result != RT_EOK)
    {
        rt_kprintf("open device failed.\n");
    }
    result = rt_device_set_rx_indicate(dev->serial, uart_input);
    if (result != RT_EOK)
    {
        rt_kprintf("set rx indicate failed.\n");
    }
#endif
    rt_thread_t thread = rt_thread_create("pms1003", serial_thread_entry, dev, 1024, 3, 10);
    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        ret = RT_ERROR;
    }

return ret;

}
//INIT_APP_EXPORT(PMS1003Init);

char tmp_buff[18]={'\0'};
char pm_buff[16]={'\0'};
char pm10_buff[16]={'\0'};
static int F_clean = 0;
static void OledThreadEntry(void *parameter)
{

u8g2_t u8g2;

u8g2_Setup_ssd1306_i2c_128x64_noname_f( &u8g2, U8G2_R0, u8x8_byte_rtthread_hw_i2c, u8x8_gpio_and_delay_rtthread);
    u8g2_InitDisplay(&u8g2);
    u8g2_SetPowerSave(&u8g2, 0);//是否开启省电模式  , 1 表示启用显示器的省电模式，屏幕上看不到任何东西,  0 表示禁用省电模式

u8g2_ClearBuffer(&u8g2);
    u8g2_SetFont(&u8g2, u8g2_font_unifont_t_arabic); //u8g2_font_ncenB08_tr  u8g2_font_unifont_t_symbols

while (1)
    {
        sprintf(tmp_buff, "Temp:%d\t Humi:%d\t", temp, humi);
        sprintf(pm_buff, "PM2.5:%d", PM2_5);
        sprintf(pm10_buff, "PM10:%d", PM10);
        rt_thread_mdelay(300);
        if (1 == F_clean)
        {
            u8g2_ClearBuffer(&u8g2);
        }
        else if (50 == F_clean)
        {
            u8g2_ClearBuffer(&u8g2);
            F_clean = 0;
        }
        u8g2_DrawStr(&u8g2, 1, 10, &tmp_buff);
        u8g2_SendBuffer(&u8g2);

u8g2_DrawStr(&u8g2, 1, 30, &pm_buff);
        u8g2_SendBuffer(&u8g2);

u8g2_DrawStr(&u8g2, 1, 50, &pm10_buff);
        u8g2_SendBuffer(&u8g2);

rt_kprintf("F_clean:%d \n",F_clean++);
    }

}

int OLED_Init()
{
    rt_err_t ret = RT_EOK;
    tid_oled = rt_thread_create("oled",
                            OledThreadEntry,
                            RT_NULL,
                            1024,
                            2,
                            THREAD_TIMESLICE);

if (tid_oled != RT_NULL)
    {
        rt_thread_startup(tid_oled);
    }
    else
    {
        ret = RT_ERROR;
    }

return ret;
}
//INIT_APP_EXPORT(OLED_Init);

void hal_entry(void)
{
    rt_kprintf("\nHello RT-Thread!\n");
    rt_uint32_t led1_pin = rt_pin_get(LED1_PIN);

dht11_init();
    PMS1003Init();
    OLED_Init();

while (1)
    {
        rt_pin_write(led1_pin, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(led1_pin, PIN_LOW);
        rt_thread_mdelay(500);
    }
}

void irq_callback_test(void *args)
{
    rt_kprintf("\n IRQ03 triggered \n");
}

void icu_sample(void)
{
    /* init */
    rt_uint32_t pin = rt_pin_get(USER_INPUT);
    rt_kprintf("\n pin number : 0x%04X \n", pin);
    rt_err_t err = rt_pin_attach_irq(pin, PIN_IRQ_MODE_RISING, irq_callback_test, RT_NULL);
    if (RT_EOK != err)
    {
        rt_kprintf("\n attach irq failed. \n");
    }
    err = rt_pin_irq_enable(pin, PIN_IRQ_ENABLE);
    if (RT_EOK != err)
    {
        rt_kprintf("\n enable irq failed. \n");
    }
}
MSH_CMD_EXPORT(icu_sample, icu sample);

```
dht11.c

```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-03-08     DYC       the first version
 */

#include "dht11.h"
#include <stdio.h>
#include "hal_data.h"
#include <board.h>

#define DBG_TAG                  "sensor.asair.dhtxx"
#ifdef PKG_USING_DHTXX_DEBUG
#define DBG_LVL                  DBG_LOG
#else
#define DBG_LVL                  DBG_ERROR
#endif
#include <rtdbg.h>

/* timing */
#define DHT1x_BEGIN_TIME         20  /* ms */
#define DHT2x_BEGIN_TIME         1   /* ms */
#define DHTxx_PULL_TIME          30  /* us */
#define DHTxx_REPLY_TIME         100 /* us */
#define MEASURE_TIME             40  /* us */

RT_WEAK void rt_hw_us_delay(rt_uint32_t us)
{
    rt_uint32_t delta;

us = us * (SysTick->LOAD / (1000000 / RT_TICK_PER_SECOND));
    delta = SysTick->VAL;

while (delta - SysTick->VAL < us) continue;
}

/**
 * This function will split a number into two part according to times.
 *
 * @param num      the number will be split
 * @param integer  the integer part
 * @param decimal  the decimal part
 * @param times    how many times of the real number (you should use 10 in this case)
 *
 * @return 0 if num is positive, 1 if num is negative
 */
int split_int(const int num, int *integer, int *decimal, const rt_uint32_t times)
{
    int flag = 0;
    if (num < 0) flag = 1;

int anum = num<0 ? -num : num;
    *integer = anum / times;
    *decimal = anum % times;

return flag;
}

/**
 * This function will convert temperature in degree Celsius to Kelvin.
 *
 * @param c  the temperature indicated by degree Celsius
 *
 * @return the result
 */
float convert_c2k(float c)
{
    return c + 273.15;
}

/**
 * This function will convert temperature in degree Celsius to Fahrenheit.
 *
 * @param c  the temperature indicated by degree Celsius
 *
 * @return the result
 */
float convert_c2f(float c)
{
    return c * 1.8 + 32;
}

/**
 * This function will convert temperature in degree Fahrenheit to Celsius.
 *
 * @param f  the temperature indicated by degree Fahrenheit
 *
 * @return the result
 */
float convert_f2c(float f)
{
    return (f - 32) * 0.55555;
}

/**
 * This function will read a bit from sensor.
 *
 * @param pin  the pin of Dout
 *
 * @return the bit value
 */
static uint8_t dht_read_bit(const rt_base_t pin)
{
    uint8_t retry = 0;

while(rt_pin_read(pin) && retry < DHTxx_REPLY_TIME)
    {
        retry++;
        rt_hw_us_delay(1);
    }

retry = 0;
    while(!rt_pin_read(pin) && retry < DHTxx_REPLY_TIME)
    {
        retry++;
        rt_hw_us_delay(1);
    }

rt_hw_us_delay(MEASURE_TIME);

return rt_pin_read(pin);
}

/**
 * This function will read a byte from sensor.
 *
 * @param pin  the pin of Dout
 *
 * @return the byte
 */
static uint8_t dht_read_byte(const rt_base_t pin)
{
    uint8_t i, byte = 0;

for(i=0; i<8; i++)
    {
        byte <<= 1;
        byte |= dht_read_bit(pin);
    }

return byte;
}

/**
 * This function will read and update data array.
 *
 * @param dev  the device to be operated
 *
 * @return RT_TRUE if read successfully, otherwise return RT_FALSE.
 */
rt_bool_t dht_read(dht_device_t dev)
{
    RT_ASSERT(dev);

uint8_t i, retry = 0, sum = 0;

#ifdef PKG_USING_DHTXX_INTERRUPT_DISABLE
    rt_base_t level;
#endif

/* Reset data buffer */
    rt_memset(dev->data, 0, DHT_DATA_SIZE);

/* MCU request sampling */
    rt_pin_mode(dev->pin, PIN_MODE_OUTPUT);
    rt_pin_write(dev->pin, PIN_LOW);

if (dev->type == DHT11) {
        rt_thread_mdelay(DHT1x_BEGIN_TIME);        /* Tbe */
    } else {
        rt_thread_mdelay(DHT2x_BEGIN_TIME);
    }

#ifdef PKG_USING_DHTXX_INTERRUPT_DISABLE
    level = rt_hw_interrupt_disable();
#endif

rt_pin_mode(dev->pin, PIN_MODE_INPUT_PULLUP);
    rt_hw_us_delay(DHTxx_PULL_TIME);               /* Tgo */

/* Waiting for sensor reply */
    while (rt_pin_read(dev->pin) && retry < DHTxx_REPLY_TIME)
    {
        retry++;
        rt_hw_us_delay(1);                         /* Trel */
    }
    if(retry >= DHTxx_REPLY_TIME) return RT_FALSE;

retry = 0;
    while (!rt_pin_read(dev->pin) && retry < DHTxx_REPLY_TIME)
    {
        retry++;
        rt_hw_us_delay(1);                         /* Treh */
    };
    if(retry >= DHTxx_REPLY_TIME) return RT_FALSE;

/* Read data */
    for(i=0; i<DHT_DATA_SIZE; i++)
    {
        dev->data[i] = dht_read_byte(dev->pin);
    }

#ifdef PKG_USING_DHTXX_INTERRUPT_DISABLE
    rt_hw_interrupt_enable(level);
#endif

/* Checksum */
    for(i=0; i<DHT_DATA_SIZE-1; i++)
    {
        sum += dev->data[i];
    }
    if(sum != dev->data[4]) return RT_FALSE;

return RT_TRUE;
}

/**
 * This function will get the humidity from dhtxx sensor.
 *
 * @param dev  the device to be operated
 *
 * @return the humidity value
 */
rt_int32_t dht_get_humidity(dht_device_t const dev)
{
    RT_ASSERT(dev);

rt_int32_t humi = 0;

switch(dev->type)
    {
    case DHT11:
        humi = dev->data[0] * 10 + dev->data[1];
        break;
    default:
        break;
    }

return humi;
}

/**
 * This function will get the temperature from dhtxx sensor.
 *
 * @param dev  the device to be operated
 *
 * @return the temperature value
 */
rt_int32_t dht_get_temperature(dht_device_t const dev)
{
    RT_ASSERT(dev);

rt_int32_t temp = 0;

switch(dev->type)
    {
    case DHT11:
        temp = dev->data[2] * 10 + (dev->data[3] & 0x7f);
        if(dev->data[3] & 0x80) {
            temp = -temp;
        }
        break;
    default:
        break;
    }

return temp;
}

/**
 * This function will init dhtxx sensor device.
 *
 * @param dev  the device to init
 * @param pin  the pin of Dout
 *
 * @return the device handler
 */
rt_err_t dht_init(struct dht_device *dev, const rt_base_t pin)
{
    if(dev == NULL)
        return -RT_ERROR;

dev->type = DHT_TYPE;
    dev->pin  = pin;

rt_memset(dev->data, 0, DHT_DATA_SIZE);
    rt_pin_mode(dev->pin, PIN_MODE_INPUT_PULLUP);

return RT_EOK;
}

// 1、初始化类型
dht_device_t dht_create(const rt_base_t pin)
{
    dht_device_t dev;

dev = rt_calloc(1, sizeof(struct dht_device));
    if (dev == RT_NULL)
    {
        LOG_E("Can't allocate memory for dhtxx device");
        return RT_NULL;
    }

dev->type = DHT_TYPE;
    dev->pin  = pin;

rt_memset(dev->data, 0, DHT_DATA_SIZE);
    rt_pin_mode(dev->pin, PIN_MODE_INPUT_PULLUP);

return dev;
}

void dht_delete(dht_device_t dev)
{
    if (dev)
        rt_free(dev);
}

```
dht11.h

```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-03-08     DYC       the first version
 */
#ifndef SRC_DHT11_H_
#define SRC_DHT11_H_

#include <stdio.h>
#include <rthw.h>
#include <rtdevice.h>
#include <board.h>

#include <rtthread.h>

#define DHTLIB_VERSION                       "0.9.0"
#define DHT_DATA_SIZE                        5

/* sensor model type */
#define DHT11                                0

#define DHT_TYPE                             DHT11

struct dht_device
{
    rt_base_t   pin;
    rt_uint8_t  type;
    rt_uint8_t  data[DHT_DATA_SIZE];
    rt_mutex_t  lock;
};

typedef struct dht_device *dht_device_t;

dht_device_t dht_create(const rt_base_t pin);
void dht_delete(dht_device_t dev);

rt_err_t   dht_init(struct dht_device *dev, const rt_base_t pin);
rt_bool_t  dht_read(dht_device_t dev);
rt_int32_t dht_get_humidity(dht_device_t dev);
rt_int32_t dht_get_temperature(dht_device_t dev);

float convert_c2k(float c);//将摄氏温度转为开氏温度
float convert_c2f(float c);//将摄氏温度转为华氏温度
float convert_f2c(float f);//将华氏温度转为摄氏温度

rt_int32_t split_int(const rt_int32_t num, rt_int32_t *integer,
                     rt_int32_t *decimal, const rt_uint32_t times);

rt_err_t rt_hw_dht_init(const char *name, struct rt_sensor_config *cfg);

#endif /* SRC_DHT11_H_ */

```
pms1003.c

//#define DBG_SECTION_NAME "pms_series"
//#define DBG_LEVEL DBG_LOG
//#define DBG_COLOR
#include <rtdbg.h>
#include <stdio.h>

#include "pms1003.h"

#define RT_SERIAL_RB_BUFSZ 64

#define COMM_START1         0x42
#define COMM_START2         0x4D

#define FRAME_HEAD1         0x00
#define FRAME_HEAD2         0x01
#define FRAME_LENH          0x02
#define FRAME_LENL          0x03
#define FRAME_RECEIVE       0x04
#define FRAME_CHECK         0x05

rt_err_t frame_check(pms_device_t dev,rt_uint8_t *buf,rt_uint16_t len)
{
    rt_uint16_t sum=0;
    RT_ASSERT(dev);
    for(uint8_t i=0;i<(len-2);i++)
    {
        sum += buf[i];
    }
    if((buf[len-1] == (sum&0xFF)) && (buf[len-2] == (sum >> 8)))
    {
        dev->PM1_0_CF1  = ((rt_uint16_t)(buf[4])<<8) | buf[5];
        dev->PM2_5_CF1  = ((rt_uint16_t)(buf[6])<<8) | buf[7];
        dev->PM10_0_CF1 = ((rt_uint16_t)(buf[8])<<8) | buf[9];
        dev->PM1_0_amb  = ((rt_uint16_t)(buf[10])<<8) | buf[11];
        dev->PM2_5_amb  = ((rt_uint16_t)(buf[12])<<8) | buf[13];
        dev->PM10_0_amb = ((rt_uint16_t)(buf[14])<<8) | buf[15];
        dev->air_0_3um  = ((rt_uint16_t)(buf[16])<<8) | buf[17];
        dev->air_0_5um  = ((rt_uint16_t)(buf[18])<<8) | buf[19];
        dev->air_1_0um  = ((rt_uint16_t)(buf[20])<<8) | buf[21];
        dev->air_2_5um  = ((rt_uint16_t)(buf[22])<<8) | buf[23];
        dev->version    = buf[len - 4];
        dev->errorCode  = buf[len - 3];

return RT_EOK;
    }
    return RT_ERROR;
}

rt_err_t pms_get_byte(pms_device_t dev, char data)
{
    rt_err_t result;
    static uint8_t state = FRAME_HEAD1;
    static uint8_t cnt = 0;
    static rt_uint8_t buf[40] = {0};
    RT_ASSERT(dev);
    if(state == FRAME_HEAD1 && data == COMM_START1)
    {
        buf[cnt++] = data;
        state = FRAME_HEAD2;
    }
    else if (state == FRAME_HEAD2 && data == COMM_START2)
    {
        buf[cnt++] = data;
        state = FRAME_LENH;
    }
    else if (state == FRAME_LENH)
    {
        buf[cnt++] = data;
        state = FRAME_LENL;
    }
    else if (state == FRAME_LENL)
    {
        buf[cnt++] = data;
        state = FRAME_RECEIVE;
    }
    else if (state == FRAME_RECEIVE)
    {
        buf[cnt++] = data;
        if(cnt >= COMM_LEN - 1)
            state = FRAME_CHECK;
    }
    else if (state == FRAME_CHECK)
    {
        buf[cnt++] = data;
        state = FRAME_HEAD1;
        cnt = 0;
        result = frame_check(dev, buf, COMM_LEN);
        if (result == RT_EOK)
        {
            LOG_D("check success");
            return result;
        }
        else
        {
            LOG_E("check error");
        }
    }
    else {}
    return result;
}

pms_device_t pms_init(const char *uart_name)
{
    pms_device_t dev;
    RT_ASSERT(uart_name);

dev = rt_calloc(1, sizeof(struct pms_device));
    if (dev == RT_NULL)
    {
        LOG_E("Can't allocate memory for pms device %s",uart_name);
        return RT_NULL;
    }
    dev->serial = rt_device_find(uart_name);
    if (!dev->serial)
    {
        rt_free(dev);
        rt_kprintf("find %s failed!\n", uart_name);
    }
    else
    {
        dev->config.baud_rate = BAUD_RATE_9600;
        dev->config.data_bits = DATA_BITS_8;
        dev->config.stop_bits = STOP_BITS_1;
        dev->config.parity = PARITY_NONE;
        dev->config.bit_order = BIT_ORDER_LSB;
        dev->config.invert = NRZ_NORMAL;
        dev->config.rx_bufsz = RT_SERIAL_RB_BUFSZ;
        dev->config.reserved = 0;
        rt_device_control(dev->serial, RT_DEVICE_CTRL_CONFIG, &dev->config);
    }
    return dev;
}

void pms_deinit(pms_device_t dev)
{
    RT_ASSERT(dev);
    rt_free(dev);
}

```
pms1003.h

#define DBG_TAG "pms_series"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <rthw.h>
#include <rtdevice.h>

#define COMM_LEN            32

struct pms_device
{
    rt_device_t serial;
    struct serial_configure config;
    rt_uint16_t len;
    rt_uint16_t PM1_0_CF1;
    rt_uint16_t PM2_5_CF1;
    rt_uint16_t PM10_0_CF1;
    rt_uint16_t PM1_0_amb;
    rt_uint16_t PM2_5_amb;
    rt_uint16_t PM10_0_amb;
    rt_uint16_t air_0_3um;
    rt_uint16_t air_0_5um;
    rt_uint16_t air_1_0um;
    rt_uint16_t air_2_5um;
    rt_uint16_t air_5_0um;
    rt_uint16_t air_10_0um;

rt_uint8_t  version;
    rt_uint8_t  errorCode;
    rt_uint16_t checksum;
};
typedef struct pms_device *pms_device_t;

pms_device_t pms_init(const char *uart_name);

rt_err_t frame_check(pms_device_t dev,rt_uint8_t *buf,rt_uint16_t len);

rt_err_t pms_get_byte(pms_device_t dev, char data);

void pms_deinit(pms_device_t dev);

#endif /* SRC_PMS1003_H_ */

```

# 五、烧录验证与扩展
基本功能做完了，由于后续买的co2， 甲醛， IAQ模块还在路上，后续到了会继续往该系统中添加，还要与ESP8266 模块通信，完成本地系统数据远程访问，通过blinker实现数据的可视化，随时随地查看室内空气质量。
附上项目工程源码：链接：https://pan.baidu.com/s/1DRrXN8fqZzlDzhmwGR7lfQ 
提取码：m651
![aa.jpg](https://oss-club.rt-thread.org/uploads/20230312/dd34930b09036fde55f1dba81d843422.jpg.webp)

![bb.jpg](https://oss-club.rt-thread.org/uploads/20230312/0278212730a7f76629f7f2c3e73c2f80.jpg.webp)

![cc.jpg](https://oss-club.rt-thread.org/uploads/20230312/d092f05f2e87e8583b2f2e4ae86de2a9.jpg.webp)