DOC《控制系统的C语言程序》

控制系统的C语言程序 #Include 'math.

h' #include 'stdio.h' Typedef union //定义一 公用体 { Unsigned int i;

Float f;

} value;

Enum{temp,humi}定义一枚举变量 #define data p1.1 //虚拟p1.1为数据线 #define sck p1.0 //虚拟p1.0为时钟线 #define reset p0.0 #define erase p0.1 #define stop p0.2 #define fwd p0.3 #define bwd p0.4 #define noack o #define ack

1 #define STATUS_REG_W 0x06 //000

0011 0 #define STATUS_REG_R 0x07 //000

0011 1 #define MEASURE_TEMP 0x03 //000

0001 1 #define MEASURE_HUMI 0x05 //000

0010 1 #define RESET 0x1e //000

1111 0 s_transstart(void)//开始传输 { data=1;

sck=0;

_nop_();

sck=1;

_nop_();

data=0;

_nop_();

Sck=0;

_nop_();

_nop_();

_nop_();

Sck=1;

_nop_();

Data=1;

_nop_();

Sck=0;

} char s_write_byte(unsigned char value)//输入命令 { Unsigned char i,erro=0;

For (i=0x80;

i>0;

i\=2) {if (i&value) data=1;

//按位与传输数据 Else data=0;

Sck=1;

_nop_();

_nop_();

_nop_();

Sck=0;

} _nop_();

Sck=1;

Erro=data;

//sht11使data脚为低电平表示收到命令 Sck=0;

_nop_();

Data=1;

//释放data脚为高电平 Return erro;

} Char s_read byte(unsigned char ack)//读测量数据 { Unsigned char,value=0;

Data=1;

For(i=0x80;

i>0,i\=2)//十六位数据 {sck=1;

If(data) value=(value|i);

//利用按位或来获取数据 Sck=0;

} Data=!ack;

//通过低电平表示应答位 Sck=1;

//下一个时钟脉冲 _nop_();

_nop_();

_nop_();

Sck=0;

data=1;

//释放数据线 return value;

} void s_connectionreset(void)//通信复位 {unsigned char i;

Data=1,sck=0;

For(i=0;

ib) {for(i=0;

i0) j+=1;

if(fwd>0&&bwd1) reset=1;

} void calc_sth11(float *p_humidity ,float *p_temperature)//计算温湿度值 { const float C1=-4.0;

//

12 Bit精度 const float C2= 0.0405;

//

12 Bit精度 const float C3=-0.0000028;

//

12 Bit精度 const float T1=0.01;

//

14 Bit @ 5V const float T2=0.00008;

// for

14 Bit @ 5V float rh=*p_humidity;

// rh: Humidity [Ticks]

12 Bit float t=*p_temperature;

// t: Temperature [Ticks]

14 Bit float rh_lin;

// rh_lin: Humidity linear float rh_true;

// rh_true: Temperature compensated humidity float t_C;

// t_C : Temperature [_C] t_C=t*0.01 C 40;

//calc. Temperature from ticks to [_C] rh_lin=C3*rh*rh + C2*rh + C1;

//calc. Humidity from ticks to [%RH] rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;

//calc. Temperature compensated humidity [%RH] if(rh_true>100)rh_true=100;

//cut if the value is outside of if(rh_true