留意：低版本的keil软件不能编译成功，由于无法处理浮点运算。
#include
#include
#define uint unsigned int
#define uchar unsigned char
#define noACK 0
#define ACK
#define STATUS_REG_W 0x06
#define STATUS_REG_R 0x07
#define MEASURE_TEMP 0x03
#define MEASURE_HUMI 0x05
#define RESET
enum {TEMP,HUMI};
typedef union //界说共用同类型
{
unsigned int i;
float f;
} value;
sbit lcdrs=P2^0;
sbit lcdrw=P2^1;
sbit lcden=P2^2;
sbit SCK = P1^0;
sbit DATA = P1^1;
uchar table2[]=”SHT11 温湿度检测”;
uchar table3[]=”温度为：
uchar table4[]=”湿度为：”;
uchar table5[]=”.”;
uchar wendu[6];
uchar shidu[6];
void delay(int z)
{
int x,y;
for(x=z;x>0;x–)
for(y=125;y>0;y–);
}
void delay_50us(uint t)
{
uint j;
for(;t>0;t–)
for(j=19;j>0;j–);
}
void delay_50ms(uint t)
{
uint j;
for(;t>0;t–)
for(j=6245;j>0;j–);
}
void write_12864com(uchar com)
{
lcdrs=0;
lcdrw=0;
delay_50us(1);
P0=com;
lcden=1;
delay_50us(10);
lcden=0;
delay_50us(2);
}
void write_dat(uchar dat)
{
lcdrs=1;
lcdrw=0;
delay_50us(1);
P0=dat;
lcden=1;
delay_50us(10);
lcden=0;
delay_50us(2);
}
void init12864lcd(void)
{
delay_50ms(2);
write_12864com(0x30);
delay_50us(4);
write_12864com(0x30);
delay_50us(4);
write_12864com(0x0f);
delay_50us(4);
write_12864com(0x01);
delay_50us(240);
write_12864com(0x06);
delay_50us(10);
write_12864com(0x0c);
delay_50us(10);
}
void display1(void)
{
uchar i;
write_12864com(0x80);
for(i=0;i<18;i++)
{
write_dat(table2[i]);
delay_50us(1);
}
}
void display2(void)
{
uchar i;
write_12864com(0x90);
for(i=0;i<18;i++)
{
write_dat(table3[i]);
delay_50us(1);
}
}
void display3(void)
{
uchar i;
write_12864com(0x88);
for(i=0;i<8;i++)
{
write_dat(table4[i]);
delay_50us(1);
}
}
void displaywendu(void)
{
uchar i;
write_12864com(0x94);
for(i=0;i<3;i++)
{
write_dat(wendu[i]);
delay_50us(1);
}
for(i=0;i<1;i++)
{
write_dat(table5[i]);
delay_50us(1);
}
for(i=4;i<5;i++)
{
write_dat(wendu[i]);
delay_50us(1);
}
}
void displayshidu(void)
{
uchar i;
write_12864com(0x8C);
for(i=0;i<3;i++)
{
write_dat(shidu[i]);
delay_50us(1);
}
for(i=0;i<1;i++)
{
write_dat(table5[i]);
delay_50us(1);
}
for(i=4;i<5;i++)
{
write_dat(shidu[i]);
delay_50us(1);
}
}
//写字节程序
char s_write_byte(unsigned char value)
{
unsigned char i,error=0;
for (i=0x80;i>0;i>>=1)
{
if (i&value) DATA=1;
}
DATA=1;
SCK=1;
error=DATA;
_nop_();_nop_();_nop_();
SCK=0;
DATA=1;
return error;
}
//读字节程序
char s_read_byte(unsigned char ack)
{
unsigned char i,val=0;
DATA=1;
for(i=0x80;i>0;i>>=1)
{
SCK=1;
}
DATA=!ack;
SCK=1;
_nop_();_nop_();_nop_();
SCK=0;
_nop_();_nop_();_nop_();
DATA=1;
return val;
}
//发动传输
void s_transstart(void)
{
}
//衔接复位
void s_connectionreset(void)
{
unsigned char i;
DATA=1; SCK=0;
for(i=0;i<9;i++)
{
SCK=1;
}
s_transstart();
}
//软复位程序
char s_softreset(void)
{
unsigned char error=0;
s_connectionreset();
error+=s_write_byte(RESET);
return error;
}
//温湿度丈量
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
{
unsigned error=0;
unsigned int i;
s_transstart();
switch(mode)
case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
}
for (i=0;i<65535;i++) if(DATA==0) break;
if(DATA) error+=1;
*(p_value) =s_read_byte(ACK);
*(p_value+1)=s_read_byte(ACK);
*p_checksum =s_read_byte(noACK); //read CRC校验码
return error; // error=1 通讯过错
}
//温湿度值标度改换及温度补偿
void calc_sth10(float *p_humidity ,float *p_temperature)
{
const float C1=-4.0;
const float C2=+0.0405;
const float C3=-0.0000028;
const float T1=+0.01;
const float T2=+0.00008;
float rh=*p_humidity;
float t=*p_temperature;
float rh_lin;
float rh_true;
float t_C;
t_C=t*0.01 – 40;
rh_lin=C3*rh*rh + C2*rh + C1;
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;
if(rh_true>100)rh_true=100;
if(rh_true<0.1)rh_true=0.1;
*p_temperature=t_C;
*p_humidity=rh_true;
}
void main(void)
{
unsigned int temp,humi;
value humi_val,temp_val; //界说两个共同体，一个用于湿度，一个用于温度
unsigned char error;
unsigned char checksum; //CRC
init12864lcd();
display1();
display2();
display3();
s_connectionreset();
while(1)
{
error=0;
error+=s_measure((unsigned char*)&temp_val.i,&checksum,TEMP); //温度丈量
error+=s_measure((unsigned char*)&humi_val.i,&checksum,HUMI); //湿度丈量
humi_val.f=(float)humi_val.i;
displaywendu();
shidu[0]=humi/1000+0;
displayshidu();
delay(800);
}
}
