基于stm32室内环境检测系统代码

由于室内环境检测系统需要检测的参数较多，例如温度、湿度、气压、CO2浓度等，所以需要使用多种传感器进行数据采集。以下是一份基于STM32的室内环境检测系统的代码，仅供参考：

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "stm32f10x.h"
#include "delay.h"
#include "usart.h"
#include "i2c.h"

#define TEMP_ADDR 0xD0  // 温度传感器I2C地址
#define HUM_ADDR 0x80   // 湿度传感器I2C地址
#define PRESS_ADDR 0xEE // 气压传感器I2C地址
#define CO2_ADDR 0x68   // CO2传感器I2C地址

float temp, hum, press, co2;

/**
 * @brief I2C读取数据
 * @param I2Cx: I2C外设
 * @param DevAddr: 设备地址
 * @param RegAddr: 寄存器地址
 * @param pBuffer: 数据缓冲区
 * @param NumByteToRead: 数据长度
 * @retval None
 */
void I2C_ReadData(I2C_TypeDef* I2Cx, uint8_t DevAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToRead)
{
    /*!< While the bus is busy */
    while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

    /*!< Send START condition */
    I2C_GenerateSTART(I2Cx, ENABLE);

    /*!< Test on EV5 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    /*!< Send device address for write */
    I2C_Send7bitAddress(I2Cx, DevAddr, I2C_Direction_Transmitter);

    /*!< Test on EV6 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    /*!< Send the device's internal address to write to */
    I2C_SendData(I2Cx, RegAddr);

    /*!< Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    /*!< Send START condition a second time */
    I2C_GenerateSTART(I2Cx, ENABLE);

    /*!< Test on EV5 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    /*!< Send device address for read */
    I2C_Send7bitAddress(I2Cx, DevAddr, I2C_Direction_Receiver);

    /*!< Test on EV6 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    /*!< While there is data to be read */
    while (NumByteToRead)
    {
        if (NumByteToRead == 1)
        {
            /*!< Disable Acknowledgement */
            I2C_AcknowledgeConfig(I2Cx, DISABLE);

            /*!< Send STOP Condition */
            I2C_GenerateSTOP(I2Cx, ENABLE);
        }

        /*!< Test on EV7 and clear it */
        if (I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED))
        {
            /*!< Read a byte from the device */
            *pBuffer = I2C_ReceiveData(I2Cx);

            /*!< Point to the next location where the byte read will be saved */
            pBuffer++;

            /*!< Decrement the read bytes counter */
            NumByteToRead--;
        }
    }

    /*!< Enable Acknowledgement to be ready for another reception */
    I2C_AcknowledgeConfig(I2Cx, ENABLE);
}

/**
 * @brief I2C写入数据
 * @param I2Cx: I2C外设
 * @param DevAddr: 设备地址
 * @param RegAddr: 寄存器地址
 * @param pBuffer: 数据缓冲区
 * @param NumByteToWrite: 数据长度
 * @retval None
 */
void I2C_WriteData(I2C_TypeDef* I2Cx, uint8_t DevAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t NumByteToWrite)
{
    /*!< While the bus is busy */
    while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));

    /*!< Send START condition */
    I2C_GenerateSTART(I2Cx, ENABLE);

    /*!< Test on EV5 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    /*!< Send device address for write */
    I2C_Send7bitAddress(I2Cx, DevAddr, I2C_Direction_Transmitter);

    /*!< Test on EV6 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

    /*!< Send the device's internal address to write to */
    I2C_SendData(I2Cx, RegAddr);

    /*!< Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    /*!< Send the byte to be written */
    while (NumByteToWrite--)
    {
        I2C_SendData(I2Cx, *pBuffer++);
        /*!< Test on EV8 and clear it */
        while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
    }

    /*!< Send STOP condition */
    I2C_GenerateSTOP(I2Cx, ENABLE);
}

/**
 * @brief 温度传感器初始化
 * @param None
 * @retval None
 */
void Temp_Init(void)
{
    uint8_t tmp = 0x00;
    I2C_WriteData(I2C1, TEMP_ADDR, 0x01, &tmp, 1);
}

/**
 * @brief 读取温度传感器数据
 * @param None
 * @retval None
 */
void Temp_Read(void)
{
    uint8_t buf[2];
    I2C_ReadData(I2C1, TEMP_ADDR, 0x00, buf, 2);
    temp = (float)(((buf[0] << 8) | buf[1]) >> 2) * 0.25;
}

/**
 * @brief 湿度传感器初始化
 * @param None
 * @retval None
 */
void Hum_Init(void)
{
    uint8_t tmp[2] = {0x02, 0x01};
    I2C_WriteData(I2C1, HUM_ADDR, 0x00, tmp, 2);
}

/**
 * @brief 读取湿度传感器数据
 * @param None
 * @retval None
 */
void Hum_Read(void)
{
    uint8_t buf[2];
    I2C_ReadData(I2C1, HUM_ADDR, 0x00, buf, 2);
    hum = (float)(((buf[0] << 8) | buf[1]) * 0.00190735 - 6);
}

/**
 * @brief 气压传感器初始化
 * @param None
 * @retval None
 */
void Press_Init(void)
{
    uint8_t tmp[2] = {0x27, 0x00};
    I2C_WriteData(I2C1, PRESS_ADDR, 0x26, tmp, 2);
}

/**
 * @brief 读取气压传感器数据
 * @param None
 * @retval None
 */
void Press_Read(void)
{
    uint8_t buf[3];
    I2C_ReadData(I2C1, PRESS_ADDR, 0x00, buf, 3);
    press = (float)(((buf[0] << 16) | (buf[1] << 8) | buf[2]) / 4096.0);
}

/**
 * @brief CO2传感器初始化
 * @param None
 * @retval None
 */
void CO2_Init(void)
{
    uint8_t tmp = 0x01;
    I2C_WriteData(I2C1, CO2_ADDR, 0x01, &tmp, 1);
}

/**
 * @brief 读取CO2传感器数据
 * @param None
 * @retval None
 */
void CO2_Read(void)
{
    uint8_t buf[2];
    I2C_ReadData(I2C1, CO2_ADDR, 0x08, buf, 2);
    co2 = (float)(((buf[0] << 8) | buf[1]) * 0.1);
}

int main(void)
{
    USART_Config();
    I2C_Config();
    Temp_Init();
    Hum_Init();
    Press_Init();
    CO2_Init();

    while (1)
    {
        Temp_Read();
        Hum_Read();
        Press_Read();
        CO2_Read();

        printf("Temp: %.2fC\tHum: %.2f%%RH\tPress: %.2fkPa\tCO2: %.2fppm\r\n", temp, hum, press, co2);

        Delay_ms(1000);
    }
}

在上述代码中，我们使用了STM32内置的I2C外设以及一些常用的函数，如I2C_ReadData()和I2C_WriteData()用于读写I2C数据。在主函数中，我们首先进行串口和I2C的配置，并对每个传感器进行初始化。然后在一个死循环中不断读取传感器数据，并通过串口输出。

需要注意的是，不同的传感器有不同的I2C地址和数据格式，因此需要根据具体的传感器手册进行配置和数据解析。此外，还需要在代码中添加对应的库文件和头文件，这里就不做展开了。