可燃气体检测传感器的程序

ID:1120726 · 发表于 2024-5-15 01:14

基于stm32，使用SGP30 CO2和TVOC传感器的初始化和数据读取程序。SGP30是一款用于测量二氧化碳（CO2）和总挥发性有机化合物（TVOC）浓度的传感器。程序中定义了相关的IIC通信函数，如起始信号、停止信号、发送和接收字节等。此外，程序还包含了一个主函数，用于初始化SGP30传感器，并读取CO2和TVOC的数据。

#include "sgp30_CO2_TVOC.h"
#include "user_peripheral.h"
#include "delay.h"
#include "usart.h"

#if SGP30_CO2_TVOC_Pre

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 SGP30_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 SGP30_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);
}

void SGP30_IIC_Start(void)
{
  SGP30_SDA_OUT();
  SGP30_SDA = 1;
  SGP30_SCL = 1;
  delay_us(20);

  SGP30_SDA = 0;
  delay_us(20);
  SGP30_SCL = 0;
}

void SGP30_IIC_Stop(void)
{
  SGP30_SDA_OUT();
  SGP30_SCL = 0;
  SGP30_SDA = 0;
  delay_us(20);
  SGP30_SCL = 1;
  SGP30_SDA = 1;
  delay_us(20);
}

u8 SGP30_IIC_Wait_Ack(void)
{
  u8 ucErrTime = 0;
  SGP30_SDA_IN();
  SGP30_SDA = 1;
  delay_us(10);
  SGP30_SCL = 1;
  delay_us(10);
  while(SGP30_SDA_READ())
  {
ucErrTime++;
if(ucErrTime > 250)
{
   SGP30_IIC_Stop();
   return 1;
}
  }
  SGP30_SCL = 0;
  return 0;
}

void SGP30_IIC_Ack(void)
{
  SGP30_SCL = 0;
  SGP30_SDA_OUT();
  SGP30_SDA = 0;
  delay_us(20);
  SGP30_SCL = 1;
  delay_us(20);
  SGP30_SCL = 0;
}

void SGP30_IIC_NAck(void)
{
  SGP30_SCL = 0;
  SGP30_SDA_OUT();
  SGP30_SDA = 1;
  delay_us(20);
  SGP30_SCL = 1;
  delay_us(20);
  SGP30_SCL = 0;
}

void SGP30_IIC_Send_Byte(u8 txd)
{
  u8 t;
  SGP30_SDA_OUT();
  SGP30_SCL = 0;
  for(t = 0; t < 8; t++)
  {
if((txd & 0x80) >> 7)
   SGP30_SDA = 1;
else
   SGP30_SDA = 0;
txd <<= 1;
delay_us(20);
SGP30_SCL = 1;
delay_us(20);
SGP30_SCL = 0;
delay_us(20);
  }
  delay_us(20);

}

u16 SGP30_IIC_Read_Byte(u8 ack)
{
  u8 i;
  u16 receive = 0;
  SGP30_SDA_IN();
  for(i = 0; i < 8; i++ )
  {
SGP30_SCL = 0;
delay_us(20);
SGP30_SCL = 1;
receive <<= 1;
if(SGP30_SDA_READ())
   receive++;
delay_us(20);
  }
  if (!ack)
SGP30_IIC_NAck();
  else
SGP30_IIC_Ack();
  return receive;
}

void SGP30_Init(void)
{
  SGP30_GPIO_Init();
  SGP30_Write(0x20, 0x03);

}

void SGP30_Write(u8 a, u8 b)
{
  SGP30_IIC_Start();
  SGP30_IIC_Send_Byte(SGP30_write);
  SGP30_IIC_Wait_Ack();
  SGP30_IIC_Send_Byte(a);
  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);
  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 = crc;
  dat <<= 8;
  dat += SGP30_IIC_Read_Byte(1);
  dat <<= 8;
  dat += SGP30_IIC_Read_Byte(0);
  SGP30_IIC_Stop();
  return(dat);
}

u32 sgp30_dat;
u32 CO2Data,TVOCData;
void SGP30_Init_ALL(void)
{
  SGP30_Init();
      delay_ms(100);
      SGP30_Write(0x20,0x08);
      sgp30_dat = SGP30_Read();
      CO2Data = (sgp30_dat & 0xffff0000) >> 16;
      TVOCData = sgp30_dat & 0x0000ffff;




      while(CO2Data == 400 && TVOCData == 0)
      {
            SGP30_Write(0x20,0x08);
            sgp30_dat = SGP30_Read();
            CO2Data = (sgp30_dat & 0xffff0000) >> 16;
               TVOCData = sgp30_dat & 0x0000ffff;
            printf("?y?ú?ì2a?D...\r\n");

            OLED_ShowString(0,4,(u8*)"co2 init wait...",16);
            delay_ms(249);

            delay_ms(251);
      }
      OLED_ShowString(0,4,(u8*)"co2 init ok...",16);
      delay_ms(500);
      OLED_Clear();
      printf("......OK.....\r\n");
}

#endif

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