这是我写的程序，请问哪里写的不对，希望各位能帮我指正一下，谢谢，我做好了好久都没连通
以下是程序：
#define ACK 0
#define NACK 1
#define HTU21_ADDRESS_Write 0x80
#define HTU21_ADDRESS_Read 0x81
#define Hold_Master_Temperature_Measurement 0xE3
#define Hold_Master_Humidity_Measurement 0xE5
#define No_Hold_Master_Temperature_Measurement 0xF3
#define No_Hold_Master_Humidity_Measurement 0xF5
#define W_User_Register 0xE6
#define R_User_Register 0xE7
#define Soft_Reset 0xFE
sbit SCL_T=P3^2;
sbit SDA_T=P3^3;
void delayus(uint us)
{
while(us--);
}
void Init_IIC(void) //free HTU21
{
SDA_T=1;
SCL_T=1;
}
void T_Start_IIC(void)
{
SDA_T=1;
SCL_T=1;
delayms(1);
SDA_T=0;
delayus(10);
SCL_T=0;
}
void T_Stop_IIC(void)
{
SCL_T=0;
SDA_T=0;
delayms(1);
SCL_T=1;
delayus(10);
SDA_T=1;
}
uchar Write_IIC_Byte(char Byte)
{
uchar i;
SCL_T=0; //Initization SCL=0, Wait Send Data to HTU21
for(i=0;i<8;i++) //Start Send Data to HTU21 From MCU
{
if(Byte & 0x80)
{
SDA_T=1; //MCU Write 1 to HTU21
}
else
{
SDA_T=0; //MCU Write 0 to HTU21
}
delayus(1); //Wait SDA=1 or SDA=0 stable;
SCL_T=1; //MCU Send
delayus(5); //Wait HTU21 Receive
SCL_T=0; //Initization SCL=0, Wait Send Next bit to HTU21
delayus(1); //Wait SCL=0 stable;
Byte<<=1;
} //Send Finished
delayus(1); // Wait Send Finished
SDA_T=0; // HTU21 Feedback Response
delayus(1);
SCL_T=1; // Receive Response
delayus(5); // Wait Receive
if(SDA_T==1)
{
SCL=0;
delayus(5);
return NACK; //invalidity
}
else
{
SCL=0;
delayus(5);
return ACK; //validity
}
}
uchar Read_IIC_Byte(char ACK_NACK)
{
uchar i,RD_Byte=0;
SCL_T=0;
delayus(5);
SDA_T=1;
delayus(5);
for(i=0;i<8;i++)
{
SCL_T= 1;
delayus(2);
RD_Byte<<= 1;
if(SDA_T==1)
{
RD_Byte|=0x01;
}
else
{
RD_Byte&=0xfe;
}
delayus(1);
SCL_T = 0;
delayus(5);
}
SDA_T=ACK_NACK;
delayus(3);
SCL_T=1;
delayus(5);
SCL_T=0;
return RD_Byte;
}
void HTU21_Reset()
{
Init_IIC();
T_Start_IIC();
Write_IIC_Byte(HTU21_ADDRESS_Write); //HTU21_ADDRESS_Write是0x80
Write_IIC_Byte(Soft_Reset); //Soft_Reset 是 0xFE
T_Stop_IIC();
}
float HTU21_Start(char what)
{
float temp=0,Humidity=0,temperature=0;
uchar MSB=0,LSB=0;
T_Start_IIC();
if(Write_IIC_Byte(HTU21_ADDRESS_Write&0xfe)==ACK)
{
if(Write_IIC_Byte(what)==ACK)
{
do
{
T_Start_IIC();
delayms(15);
}while(Write_IIC_Byte(HTU21_ADDRESS_Write|0x01)==NACK);
MSB = Read_IIC_Byte(ACK);
LSB = Read_IIC_Byte(ACK);
Read_IIC_Byte(NACK); //Checksum + NACK
T_Stop_IIC();
LSB &= 0xfc;
// temp=HumidityH*256+HumidityL;
temp=(MSB<<8)|LSB;
if(what==((char)No_Hold_Master_Humidity_Measurement))
{
/*
equation:RH%=-6+125*SRH/2^RH_Resolution
*/
Humidity=temp*125/65535-6;
return Humidity;
}
else
{
/*
equation:¡æ=-46.85+175.12*ST/2^T_Resolution
*/
temperature=temp*175.12/65535-46.85;
return temperature;
}
}
}
return 0;
}
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