MSP5438驱动温湿度传感器SHT11，debug有数据，而连续运行得不到数据

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MSP5438驱动温湿度传感器SHT11，debug有数据，而连续运行得不到数据 [复制链接]

430系列5438A驱动温湿度传感器SHT11，单次debug可以测得温度和湿度值，而连续运行得不到结果。求问原因。

以下为部分代码：

void delay_1us(void)

{

  int sec;

  for(sec=0;sec<8;sec++)

  {

    _NOP();

  }

}

void Transmit_Start(void)

{

  P9DIR|=0x02;

  SDA_1(); SCL_0();

  delay_1us();

  SCL_1(); 

  delay_1us();

  SDA_0(); 

  delay_1us();

  SCL_0(); 

  delay_1us();  

  SCL_1(); 

  delay_1us();

  SDA_1(); 

  delay_1us();

  SCL_0();

}

void Connection_Reset(void)

{

  unsigned int i;

  delay_1us();

  SDA_1();

  delay_1us();

  SCL_0();

  delay_1us();

  for(i = 0; i < 9 ; i++) 

  {

    SCL_1();

    delay_1us();

    SCL_0();

    delay_1us();

 }

  Transmit_Start();

}

char Write_Byte (unsigned char value)

{

  unsigned char k,error=0;

  P9DIR|=0X02;P9REN&=0xFD;//1OUT

  delay_1us();

  for(k=0;k<8;k++,value<<=1)

  {

    if(value & 0x80) 

    {

     SDA_1();

    }

    else 

    {

      SDA_0();

    }

    delay_1us();

    SCL_1();

    delay_1us();

    SCL_0();

    delay_1us();

  }

  P9DIR&=0XFD;P9REN|=0x02;P9OUT|=0x02;//9.1Input with pullup resistor

  

  SCL_1();

  delay_1us();

  error =P9IN&0X02;

  SCL_0();

  delay_1us();

  

  P9DIR|=0x02;

  delay_1us();

  SDA_1();SDA_1();

  return error;

}

char Read_Byte(unsigned char ack)

{

  unsigned char i,val =0x00;

  P9DIR&=0XFD;P9REN|=0x02;P9OUT|=0x02;//9.1输入模式，选择上拉电阻

  for(i=0;i<8;i++)

  {

    val<<=1;

    SCL_1();

    delay_1us();

    if(P9IN&0X02) val =(val|0x1);

    SCL_1();

    delay_1us();

  }

  P9DIR|=0X02;P9REN&=0xFD;//9.1 OUT

  delay_1us();

  if(ack==1)

  {

    SDA_0();

  }

  else

  {

    SDA_1();

  }

  _NOP();

  SCL_1();

  delay_1us();

  SCL_0();

  delay_1us();

  P9DIR&=0XFD;P9REN|=0x02;P9OUT|=0x02;//9.1输入模式，选择上拉电阻

  delay_1us();

  return val;

}

char Measure_Mode(unsigned char *P_Value,unsigned char *P_Checksum,unsigned char Mode)

{

unsigned char error=0;

unsigned int i,j;

        Transmit_Start();

switch(Mode)

{

case 0: error+= Write_Byte(measure_temp); break;

case 1: error+= Write_Byte(measure_humi); break;

default: break;

}

        for(j=125;j>0;j--)

        {

          for(i=65535;i>0;i--)

          {

if(P9IN&0X02==0) break;

          }

          if(P9IN&0X02==0) break;

        }

if(P9IN&0X02) error+=1;

*P_Value =Read_Byte(ACK);

*(P_Value+1) =Read_Byte(ACK);

*P_Checksum =Read_Byte(noACK);

        P9DIR|=0x02;

return error;

}

void Cal_SHT11(float *P_Temp,float *P_Humi)

{

const float C1 =-2.0468;

const float C2 =+0.0367;

const float C3 =-0.0000015955;

const float T1 =+0.01;

const float T2 =0.00008;

float rh =*P_Humi;

float t =*P_Temp;

float rh_near,rh_true,t_c;

t_c =t*0.01-40.1;

rh_near =C1+C2*rh+C3*rh*rh;

rh_true =(t_c-25)*(T1+T2*rh)+rh_near;

if(rh_true>100) rh_true=100;       //cut if the value is outside of 

        if(rh_true<0.1) rh_true=0.1;       //the physical possible range 

        

*P_Temp =t_c;        //返回温度

*P_Humi =rh_true; //返回相对湿度（rh%）

}

void Data_To_String(SHTscatter *Time,float DATA,float DATA1)

{

unsigned int i;char gewei,shiwei;

    i=(int)DATA;

shiwei=i/10;

gewei =i%10;

    Time->DATAstrings1[0] = shiwei + '0';

Time->DATAstrings1[1] = gewei + '0';

i=(int)((DATA-i)*10); 

Time->DATAstrings1[2] ='.';

Time->DATAstrings1[3] = i + '0';

Time->DATAstrings1[4] = '\0';

    i=(int)DATA1;

shiwei=i/10;

gewei =i%10;

    Time->DATAstrings2[0] = shiwei + '0';

Time->DATAstrings2[1] = gewei + '0';   

i=(int)((DATA1-i)*10); 

Time->DATAstrings2[2] ='.';

Time->DATAstrings2[3] = i + '0';

Time->DATAstrings2[4] = '\0';

}

void Show_Tehu(void)

{

SHTscatter S;

SHTValue Temp_Value,Humi_Value;

unsigned char error,checksum;

        

error =0;      

error =Measure_Mode((unsigned char*) &Humi_Value.i,&checksum,1)+error;  //湿度

error =Measure_Mode((unsigned char*) &Temp_Value.i,&checksum,0)+error;  //温度

        if(error!=0)

         {

   Connection_Reset();

          }

         else

        {

          Humi_Value.f =(float)Humi_Value.i;

          Temp_Value.f =(float)Temp_Value.i;

          Cal_SHT11(&Humi_Value.f,&Temp_Value.f);

          Data_To_String(&S,Temp_Value.f,Humi_Value.f);

          PutStringEN24(188,200,S.DATAstrings1); //温度值

          PutStringEN24(140,200,S.DATAstrings2); //相对湿度值(%)

        }

}

  

larrybirdkobe

你是用IO口模拟I2C的啊！

magicnanda

没有模拟I2C，传送部分是传感器SHT11的工作时序。

soclab

楼主解决没有，我也遇到相同的问题了，能不能告诉一下，解决的办法啊！ 联系方式QQ：1145751528  小弟万分感谢！