sgp30气体基于51测量气体的程序

以下是一个基于51单片机的SGP30气体传感器测量程序示例，你可以参考一下：

#include <reg52.h>
#include <stdio.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit SDA = P2^0;    // I2C总线数据线
sbit SCL = P2^1;    // I2C总线时钟线

// SGP30 I2C地址
#define SGP30_ADDR 0x58

// SGP30命令码
#define SGP30_CMD_IAQ_INIT          0x2003
#define SGP30_CMD_IAQ_MEASURE       0x2008
#define SGP30_CMD_GET_BASELINE      0x2015
#define SGP30_CMD_SET_BASELINE      0x201E
#define SGP30_CMD_MEASURE_RAW_SIGNAL 0x2050
#define SGP30_CMD_MEASURE_TVOC_INCEPTANCE 0x20B7
#define SGP30_CMD_MEASURE_H2_SIGNAL 0x209D

// SGP30的CRC校验多项式
#define CRC_POLYNOMIAL              0x31

// SGP30读取到的数据结构体
typedef struct {
    uchar data[6];
    uchar crc;
} Sgp30Data;

// SGP30传感器初始化函数
void Sgp30Init()
{
    // 发送IAQ初始化命令
    uchar buf[2] = {SGP30_CMD_IAQ_INIT >> 8, SGP30_CMD_IAQ_INIT & 0xFF};
    I2cStart();
    I2cWriteByte(SGP30_ADDR << 1);
    I2cWriteByte(buf[0]);
    I2cWriteByte(buf[1]);
    I2cStop();
}

// 从SGP30读取数据
uchar Sgp30ReadData(Sgp30Data *data)
{
    uchar i, crc = 0;
    I2cStart();
    I2cWriteByte((SGP30_ADDR << 1) | 0x01);
    for (i = 0; i < 6; i++) {
        data->data[i] = I2cReadByte();
        crc = Sgp30Crc(data->data[i], crc);
    }
    data->crc = I2cReadByte();
    I2cStop();
    return crc;
}

// 从SGP30读取一个16位的字
uint Sgp30ReadWord()
{
    Sgp30Data data;
    uchar crc;
    crc = Sgp30ReadData(&data);
    if (crc != data.crc) {
        return 0xFFFF;
    }
    return (data.data[0] << 8) | data.data[1];
}

// 计算SGP30的CRC校验值
uchar Sgp30Crc(uchar data, uchar crc)
{
    uchar i;
    crc ^= data;
    for (i = 8; i > 0; i--) {
        if (crc & 0x80) {
            crc = (crc << 1) ^ CRC_POLYNOMIAL;
        } else {
            crc <<= 1;
        }
    }
    return crc;
}

// I2C总线起始信号
void I2cStart()
{
    SDA = 1;
    SCL = 1;
    _nop_();
    SDA = 0;
    _nop_();
    SCL = 0;
}

// I2C总线停止信号
void I2cStop()
{
    SDA = 0;
    SCL = 1;
    _nop_();
    SDA = 1;
    _nop_();
}

// 写一个字节到I2C总线
void I2cWriteByte(uchar dat)
{
    uchar i;
    for (i = 0; i < 8; i++) {
        SDA = (dat & 0x80) ? 1 : 0;
        _nop_();
        SCL = 1;
        _nop_();
        SCL = 0;
        dat <<= 1;
    }
    SDA = 1;
    _nop_();
    SCL = 1;
    _nop_();
    SCL = 0;
}

// 从I2C总线读一个字节
uchar I2cReadByte()
{
    uchar i, dat = 0;
    SDA = 1;
    for (i = 0; i < 8; i++) {
        SCL = 1;
        _nop_();
        dat <<= 1;
        dat |= SDA;
        SCL = 0;
        _nop_();
    }
    return dat;
}

void main()
{
    uint co2, tvoc;
    Sgp30Init();
    while (1) {
        // 发送IAQ测量命令
        uchar buf[2] = {SGP30_CMD_IAQ_MEASURE >> 8, SGP30_CMD_IAQ_MEASURE & 0xFF};
        I2cStart();
        I2cWriteByte(SGP30_ADDR << 1);
        I2cWriteByte(buf[0]);
        I2cWriteByte(buf[1]);
        I2cStop();

        // 等待数据准备好
        delay_ms(10);

        // 读取CO2和TVOC值
        co2 = Sgp30ReadWord();
        tvoc = Sgp30ReadWord();

        // 输出结果
        printf("CO2: %d ppm, TVOC: %d ppb\r\n", co2, tvoc);

        // 延时一段时间再次读取
        delay_ms(5000);
    }
}

需要注意的是，这只是一个简单的示例程序，实际应用中需要根据具体情况进行修改。