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【STM32单片机】SGP30 二氧化碳传感器模块 程序代码_sgp30代码

作者：知新_RL | 2024-05-21 18:29:40

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sgp30代码

在这里插入图片描述

sgp30.c

#include "sgp30.h"
#include "Systick_Delay.h"



void SGP30_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(SGP30_SCL_GPIO_CLK | SGP30_SDA_GPIO_SDA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = SGP30_SCL_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(SGP30_SCL_GPIO_PORT, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = SGP30_SDA_GPIO_PIN;
  GPIO_Init(SGP30_SDA_GPIO_PORT, &GPIO_InitStructure);
}


void SDA_OUT(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = SGP30_SDA_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(SGP30_SDA_GPIO_PORT, &GPIO_InitStructure);
}

void SDA_IN(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = SGP30_SDA_GPIO_PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(SGP30_SDA_GPIO_PORT, &GPIO_InitStructure);
}

//产生IIC起始信号
void SGP30_IIC_Start(void)
{
  SDA_OUT();
  SGP30_SDA_HIGH;
  SGP30_SCL_HIGH;
  delay_us(20);

//  SGP30_SDA = 0;	//START:when CLK is high,DATA change form high to low
	SGP30_SDA_LOW;
  delay_us(20);
//  SGP30_SCL = 0; 	//钳住I2C总线，准备发送或接收数据
	SGP30_SCL_LOW;
}

//产生IIC停止信号
void SGP30_IIC_Stop(void)
{
  SDA_OUT();
//  SGP30_SCL = 0;
//  SGP30_SDA = 0;	//STOP:when CLK is high DATA change form low to high
	SGP30_SCL_LOW;
	SGP30_SDA_LOW;
  delay_us(20);
//  SGP30_SCL = 1;
//  SGP30_SDA = 1;	//发送I2C总线结束信号
	SGP30_SCL_HIGH;
	SGP30_SDA_HIGH;
  delay_us(20);
}

//等待应答信号到来
//返回值：1，接收应答失败
//        0，接收应答成功
u8 SGP30_IIC_Wait_Ack(void)
{
  u8 ucErrTime = 0;
  SDA_IN();
//  SGP30_SDA = 1;
	SGP30_SDA_HIGH;
  delay_us(10);
//  SGP30_SCL = 1;
	SGP30_SCL_HIGH;
  delay_us(10);
  while(SGP30_SDA_READ())
  {
    ucErrTime++;
    if(ucErrTime > 250)
    {
      SGP30_IIC_Stop();
      return 1;
    }
  }
//  SGP30_SCL = 0;  		//时钟输出0
	SGP30_SCL_LOW;
  return 0;
}

//产生ACK应答
void SGP30_IIC_Ack(void)
{
//  SGP30_SCL = 0;
	SGP30_SCL_LOW;
  SDA_OUT();
//  SGP30_SDA = 0;
	SGP30_SDA_LOW;
  delay_us(20);
//  SGP30_SCL = 1;
	SGP30_SCL_HIGH;
  delay_us(20);
//  SGP30_SCL = 0;
	SGP30_SCL_LOW;
}

//不产生ACK应答
void SGP30_IIC_NAck(void)
{
//  SGP30_SCL = 0;
	SGP30_SCL_LOW;
  SDA_OUT();
//  SGP30_SDA = 1;
	SGP30_SDA_HIGH;
  delay_us(20);
//  SGP30_SCL = 1;
	SGP30_SCL_HIGH;
  delay_us(20);
//  SGP30_SCL = 0;
	SGP30_SCL_LOW;
}

//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
void SGP30_IIC_Send_Byte(u8 txd)
{
  u8 t;
  SDA_OUT();
//  SGP30_SCL = 0; 	    	//拉低时钟开始数据传输
	SGP30_SCL_LOW;
  for(t = 0; t < 8; t++)
  {
    if((txd & 0x80) >> 7)
//      SGP30_SDA = 1;
			SGP30_SDA_HIGH;
    else
//      SGP30_SDA = 0;
		SGP30_SDA_LOW;
    txd <<= 1;
    delay_us(20);
//    SGP30_SCL = 1;
		SGP30_SCL_HIGH;
    delay_us(20);
//    SGP30_SCL = 0;
		SGP30_SCL_LOW;
    delay_us(20);
  }
  delay_us(20);

}

//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
u16 SGP30_IIC_Read_Byte(u8 ack)
{
  u8 i;
  u16 receive = 0;
  SDA_IN();
  for(i = 0; i < 8; i++ )
  {
//    SGP30_SCL = 0;
		SGP30_SCL_LOW;
    delay_us(20);
//    SGP30_SCL = 1;
		SGP30_SCL_HIGH;
    receive <<= 1;
    if(SGP30_SDA_READ())
      receive++;
    delay_us(20);
  }
  if (!ack)
    SGP30_IIC_NAck();//发送nACK
  else
    SGP30_IIC_Ack(); //发送ACK
  return receive;
}


//初始化IIC接口
void SGP30_Init(void)
{
  SGP30_GPIO_Init();
  SGP30_Write(0x20, 0x03);
//	SGP30_ad_write(0x20,0x61);
//	SGP30_ad_write(0x01,0x00);
}


void SGP30_Write(u8 a, u8 b)
{
  SGP30_IIC_Start();
  SGP30_IIC_Send_Byte(SGP30_write); //发送器件地址+写指令
  SGP30_IIC_Wait_Ack();
  SGP30_IIC_Send_Byte(a);		//发送控制字节
  SGP30_IIC_Wait_Ack();
  SGP30_IIC_Send_Byte(b);
  SGP30_IIC_Wait_Ack();
  SGP30_IIC_Stop();
  delay_ms(100);
}

u32 SGP30_Read(void)
{
  u32 dat;
  u8 crc;
  SGP30_IIC_Start();
  SGP30_IIC_Send_Byte(SGP30_read); //发送器件地址+读指令
  SGP30_IIC_Wait_Ack();
  dat = SGP30_IIC_Read_Byte(1);
  dat <<= 8;
  dat += SGP30_IIC_Read_Byte(1);
  crc = SGP30_IIC_Read_Byte(1); //crc数据，舍去
  crc = crc;  //为了不让出现编译警告
  dat <<= 8;
  dat += SGP30_IIC_Read_Byte(1);
  dat <<= 8;
  dat += SGP30_IIC_Read_Byte(0);
  SGP30_IIC_Stop();
  return(dat);
}




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sgp30.h

#ifndef __SG_H
#define __SG_H
#include "stm32f10x.h"

//#define  SGP30_SCL   PBout(0)
//#define  SGP30_SDA   PBout(1)

#define  SGP30_SCL_LOW    GPIO_ResetBits ( GPIOB, GPIO_Pin_0 )
#define  SGP30_SCL_HIGH    GPIO_SetBits ( GPIOB, GPIO_Pin_0 )

#define  SGP30_SDA_LOW    GPIO_ResetBits ( GPIOB, GPIO_Pin_1 )
#define  SGP30_SDA_HIGH    GPIO_SetBits ( GPIOB, GPIO_Pin_1 )
//#define  SGP30_SDA   PBout(1)

// USART GPIO 引脚宏定义
#define  SGP30_SCL_GPIO_CLK        RCC_APB2Periph_GPIOB
#define  SGP30_SCL_GPIO_PORT       GPIOB
#define  SGP30_SCL_GPIO_PIN        GPIO_Pin_0

#define  SGP30_SDA_GPIO_SDA        RCC_APB2Periph_GPIOB
#define  SGP30_SDA_GPIO_PORT       GPIOB
#define  SGP30_SDA_GPIO_PIN        GPIO_Pin_1

#define  SGP30_SDA_READ()           GPIO_ReadInputDataBit(SGP30_SDA_GPIO_PORT, SGP30_SDA_GPIO_PIN)

#define SGP30_read  0xb1  //SGP30的读地址
#define SGP30_write 0xb0  //SGP30的写地址


void SGP30_IIC_Start(void);				//发送IIC开始信号
void SGP30_IIC_Stop(void);	  			//发送IIC停止信号
void SGP30_IIC_Send_Byte(u8 txd);			//IIC发送一个字节
u16 SGP30_IIC_Read_Byte(unsigned char ack);//IIC读取一个字节
u8 SGP30_IIC_Wait_Ack(void); 				//IIC等待ACK信号
void SGP30_IIC_Ack(void);					//IIC发送ACK信号
void SGP30_IIC_NAck(void);				//IIC不发送ACK信号
void SGP30_IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data);
u8 SGP30_IIC_Read_One_Byte(u8 daddr,u8 addr);	
void SGP30_Init(void);				  
void SGP30_Write(u8 a, u8 b);
u32 SGP30_Read(void);



#endif



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main.c

main
{
	SGP30_Init();   //初始化SGP30
	delay_ms(100);
	SGP30_Write(0x20,0x08);
	sgp30_dat = SGP30_Read();//读取SGP30的值
		while(CO2Data == 400)
	{
		SGP30_Write(0x20,0x08);
		sgp30_dat = SGP30_Read();//读取SGP30的值
		CO2Data = (sgp30_dat & 0xffff0000) >> 16;//取出CO2浓度值
		printf("正在检测中...\r\n");
		delay_ms(500);
	}

    while(1)
    {
     	SGP30_Write(0x20,0x08);
		sgp30_dat = SGP30_Read();//读取SGP30的值
		CO2Data = (sgp30_dat & 0xffff0000) >> 16;//取出CO2浓度值

    }


}
	

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