📄 sht10.lst
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C51 COMPILER V8.08 SHT10 01/11/2009 23:45:33 PAGE 1
C51 COMPILER V8.08, COMPILATION OF MODULE SHT10
OBJECT MODULE PLACED IN SHT10.OBJ
COMPILER INVOKED BY: F:\Keil\C51\BIN\C51.EXE SHT10.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include"SHT10.h"
2 #include <reg52.h>
3 #include<intrins.h>
4 #include<delay.h>
5
6
7 sbit SCK = P2^0; //define clock interface
8 sbit DATA = P2^1; //define data interface
9
10
11
12
13 typedef union
14 { unsigned int i;
15 float f;
16 } value;
17
18 /********************************************************************
19 函数名称:transStartSHT10 启动传输
20 入口参数：无
21 返回参数：无
22 *********************************************************************/
23 void TransStartSHT10(void)
24 {
25 1 DATA=1; SCK=0;
26 1 _nop_();
27 1 SCK=1;
28 1 _nop_();
29 1 DATA=0;
30 1 _nop_();
31 1 SCK=0;
32 1 _nop_();_nop_();_nop_();
33 1 SCK=1;
34 1 _nop_();
35 1 DATA=1;
36 1 _nop_();
37 1 SCK=0;
38 1 }
39
40 /*********************************************************************
41 函数名称:connectionResetSHT10 重新连接
42 入口参数：无
43 返回参数：无
44 *********************************************************************/
45 void ConnectionResetSHT10(void)
46 {
47 1 uchar i;
48 1 DATA=1; SCK=0; //Initial state
49 1 for(i=0;i<9;i++) //9 SCK cycles
50 1 {
51 2 SCK=1;
52 2 SCK=0;
53 2 }
54 1 TransStartSHT10(); //transmission start
55 1 }
C51 COMPILER V8.08 SHT10 01/11/2009 23:45:33 PAGE 2
56
57 /********************************************************************
58 函数名称：writeSHT10 写数据
59 入口参数：value
60 返回参数：error (0成功/1失败)
61 ********************************************************************/
62
63 char WriteSHT10(uchar value)
64 {
65 1 uchar i,error=0;
66 1 for (i=0x80;i>0;i/=2) //shift bit for masking
67 1 {
68 2 if (i & value) DATA=1; //masking value with i , write to SENSI-BUS
69 2 else DATA=0;
70 2 SCK=1; //clk for SENSI-BUS
71 2 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
72 2 SCK=0;
73 2 }
74 1 DATA=1; //release DATA-line
75 1 SCK=1; //clk #9 for ack
76 1 error=DATA; //check ack (DATA will be pulled down by DHT90),DATA在第9个上升沿将被D
-HT90自动下拉为低电平。
77 1 _nop_();_nop_();_nop_();
78 1 SCK=0;
79 1 DATA=1; //release DATA-line
80 1 return error; //error=1 in case of no acknowledge //返回：0成功，1失败
81 1 }
82
83 /********************************************************************
84 函数名称:readSHT10 读数据
85 入口参数：ack
86 返回参数：val（ack=0时读数据，返回val）
87 *********************************************************************/
88
89 char ReadSHT10(uchar ack)
90 {
91 1 uchar i,val=0;
92 1 DATA=1; //release DATA-line
93 1 for (i=0x80;i>0;i/=2) //shift bit for masking
94 1 { SCK=1; //clk for SENSI-BUS
95 2 if (DATA) val=(val | i); //read bit
96 2 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
97 2 SCK=0;
98 2 }
99 1 if(ack==1)DATA=0; //in case of "ack==1" pull down DATA-Line
100 1 else DATA=1; //如果是校验(ack==0)，读取完后结束通讯
101 1 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
102 1 SCK=1; //clk #9 for ack
103 1 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
104 1 SCK=0;
105 1 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
106 1 DATA=1; //release DATA-line
107 1 return val;
108 1 }
109
110 /*********************************************************************
111 函数名称:measureSHT10 测量温度
112 入口参数:*p_value,*p_checksum,mode
113 返回参数:error(0成功/1失败)
114 *********************************************************************/
115
116 char MeasureSHT10(uchar *p_value, uchar *p_checksum, uchar mode)
C51 COMPILER V8.08 SHT10 01/11/2009 23:45:33 PAGE 3
117 {
118 1 unsigned error=0;
119 1 uchar i;
120 1
121 1 TransStartSHT10(); //transmission start
122 1 switch(mode){ //send command to sensor
123 2 case 01 : error+=WriteSHT10(MEASURE_TEMP); break;
124 2 case 02 : error+=WriteSHT10(MEASURE_HUMI); break;
125 2 default : break;
126 2 }
127 1 for (i=0;i<110;i++) {delay(2);if(DATA==0) break;} //wait until sensor has finished the measurement
128 1 if(DATA) error+=1; // or timeout (~2 sec.) is reached
129 1 *(p_value) =ReadSHT10(ACK); //read the first byte (MSB)
130 1 *(p_value+1)=ReadSHT10(ACK); //read the second byte (LSB)
131 1 *p_checksum =ReadSHT10(noACK); //read checksum
132 1 return error;
133 1 }
134
135 /********************************************************************
136 函数名称: calcSHT10 计算温度和相对湿度值
137 入口参数：*p_humidity ,*p_temperature
138 返回参数：无
139 ********************************************************************/
140 void CalcSHT10(float *p_humidity ,float *p_temperature)
141 // calculates temperature [C] and humidity [%RH]
142 // input : humi [Ticks] (12 bit)
143 // temp [Ticks] (14 bit)
144 // output: humi [%RH]
145 // temp [C]
146 { const float C1=-4.0; // for 12 Bit
147 1 const float C2=0.0405; // for 12 Bit
148 1 const float C3=-0.0000028; // for 12 Bit
149 1 const float T1=0.01; // for 14 Bit @ 5V
150 1 const float T2=0.00008; // for 14 Bit @ 5V
151 1
152 1 float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit
153 1 float t=*p_temperature; // t: Temperature [Ticks] 14 Bit
154 1 float rh_lin; // rh_lin: Humidity linear
155 1 float rh_true; // rh_true: Temperature compensated humidity
156 1 float t_C; // t_C : Temperature [C]
157 1
158 1 t_C=t*0.01 - 40; //calc. temperature from ticks to [C]
159 1 rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH]
160 1 rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; //calc. temperature compensated humidity [%RH]
161 1 if(rh_true>100)rh_true=100; //cut if the value is outside of
162 1 if(rh_true<0.1)rh_true=0.1; //the physical possible range
163 1
164 1 *p_temperature=t_C; //return temperature [C]
165 1 *p_humidity=rh_true; //return humidity[%RH]
166 1 }
167
168 /********************************************************************
169 函数名称: getSHT10()
170 入口参数：float temp,float humi
171 返回参数：无
172 ********************************************************************/
173 void GetSHT10(float *temp,float *humi)
174 {
175 1 value humi_val,temp_val;
176 1 uchar error,checksum;
177 1 error=0;
178 1 error+=MeasureSHT10((uchar*) &humi_val.i,&checksum,HUMI); //measure humidity
C51 COMPILER V8.08 SHT10 01/11/2009 23:45:33 PAGE 4
179 1 error+=MeasureSHT10((uchar*) &temp_val.i,&checksum,TEMP); //measure temperature
180 1 if(error!=0) ConnectionResetSHT10(); //in case of an error: connection reset
181 1 else
182 1 { humi_val.f=(float)humi_val.i; //converts integer to float
183 2 temp_val.f=(float)temp_val.i; //converts integer to float
184 2 CalcSHT10(&humi_val.f,&temp_val.f); //calculate humidity, temperature
185 2
186 2 *temp=temp_val.f;
187 2 *humi=humi_val.f;
188 2
189 2 }
190 1 }
191
192
193
194
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 833 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 72
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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