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C51 COMPILER V8.05a TEXT1 07/03/2007 18:01:22 PAGE 1
C51 COMPILER V8.05a, COMPILATION OF MODULE TEXT1
OBJECT MODULE PLACED IN Text1.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE Text1.C BROWSE DEBUG OBJECTEXTEND
line level source
1 /* ----------------------- 版权声明 ----------------------------------
2 ------------------------------ 创新科技 2007/01/05 --------------------------
3
4 -------------- Mobile:13433018379 (陶志学) ----------------------------------
5 ------ Email:taozhixue123@163.com --------
6 未经东莞市创新科技书面同意, 不得将本程序泄露、公开给第三方。
7 不得将本程序(或修改后的程序)使用在非东莞市创新科技销售的产品上。
8 客户产品上使用本程序时，客户产品的源程序中必须注明使用了东莞市创新科技的程序，
9 并保留如下内容:
10 ******************************************************************************** */
11 //SHTxx程序演示 89 系列 MCU。 时钟12MHZ
12 //结果以数码管显示
13
14
15 #include <reg51.h> //Microcontroller specific library, e.g. port definitions
16 #include <intrins.h> //Keil library (is used for _nop()_ operation)
17 #include <math.h> //Keil library
18 #include <stdio.h> //Keil library
19 const unsigned char DATA_7SEG[ ] ={0xc0,0xcf,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
20 unsigned char led[6];
21
22 typedef union
23 { unsigned int i;
24 float f;
25 } value;
26
27 //----------------------------------------------------------------------------------
28 // modul-var
29 //----------------------------------------------------------------------------------
30 enum {TEMP,HUMI};
31
32 sbit DATA= P2^3;
33 sbit SCK= P2^7;
34
35 #define noACK 0
36 #define ACK 1
37 //adr command r/w
38 #define STATUS_REG_W 0x06 //000 0011 0
39 #define STATUS_REG_R 0x07 //000 0011 1
40 #define MEASURE_TEMP 0x03 //000 0001 1
41 #define MEASURE_HUMI 0x05 //000 0010 1
42 #define RESET 0x1e //000 1111 0
43
44 //----------------------------------------------------------------------------------
45 char s_write_byte(unsigned char value)
46 //----------------------------------------------------------------------------------
47 // writes a byte on the Sensibus and checks the acknowledge
48 {
49 1 unsigned char i,error=0;
50 1 for (i=0x80;i>0;i/=2) //shift bit for masking
51 1 { if (i & value) DATA=1; //masking value with i , write to SENSI-BUS
52 2 else DATA=0;
53 2 SCK=1; //clk for SENSI-BUS
54 2 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
55 2 SCK=0;
C51 COMPILER V8.05a TEXT1 07/03/2007 18:01:22 PAGE 2
56 2 }
57 1 DATA=1; //release DATA-line
58 1 SCK=1; //clk #9 for ack
59 1 error=DATA; //check ack (DATA will be pulled down by SHT11)
60 1 SCK=0;
61 1 return error; //error=1 in case of no acknowledge
62 1 }
63
64 //----------------------------------------------------------------------------------
65 char s_read_byte(unsigned char ack)
66 //----------------------------------------------------------------------------------
67 // reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
68 {
69 1 unsigned char i,val=0;
70 1 DATA=1; //release DATA-line
71 1 for (i=0x80;i>0;i/=2) //shift bit for masking
72 1 { SCK=1; //clk for SENSI-BUS
73 2 if (DATA) val=(val | i); //read bit
74 2 SCK=0;
75 2 }
76 1 DATA=!ack; //in case of "ack==1" pull down DATA-Line
77 1 SCK=1; //clk #9 for ack
78 1 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
79 1 SCK=0;
80 1 DATA=1; //release DATA-line
81 1 return val;
82 1 }
83
84 //----------------------------------------------------------------------------------
85 void s_transstart(void)
86 //----------------------------------------------------------------------------------
87 // generates a transmission start
88 // _____ ________
89 // DATA: |_______|
90 // ___ ___
91 // SCK : ___| |___| |______
92 {
93 1 DATA=1; SCK=0; //Initial state
94 1 _nop_();
95 1 SCK=1;
96 1 _nop_();
97 1 DATA=0;
98 1 _nop_();
99 1 SCK=0;
100 1 _nop_();_nop_();_nop_();
101 1 SCK=1;
102 1 _nop_();
103 1 DATA=1;
104 1 _nop_();
105 1 SCK=0;
106 1 }
107
108 //----------------------------------------------------------------------------------
109 void s_connectionreset(void)
110 //----------------------------------------------------------------------------------
111 // communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
112 // _____________________________________________________ ________
113 // DATA: |_______|
114 // _ _ _ _ _ _ _ _ _ ___ ___
115 // SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
116 {
117 1 unsigned char i;
C51 COMPILER V8.05a TEXT1 07/03/2007 18:01:22 PAGE 3
118 1 DATA=1; SCK=0; //Initial state
119 1 for(i=0;i<9;i++) //9 SCK cycles
120 1 { SCK=1;
121 2 SCK=0;
122 2 }
123 1 s_transstart(); //transmission start
124 1 }
125
126 //----------------------------------------------------------------------------------
127 char s_softreset(void)
128 //----------------------------------------------------------------------------------
129 // resets the sensor by a softreset
130 {
131 1 unsigned char error=0;
132 1 s_connectionreset(); //reset communication
133 1 error+=s_write_byte(RESET); //send RESET-command to sensor
134 1 return error; //error=1 in case of no response form the sensor
135 1 }
136
137 //----------------------------------------------------------------------------------
138 char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)
139 //----------------------------------------------------------------------------------
140 // reads the status register with checksum (8-bit)
141 {
142 1 unsigned char error=0;
143 1 s_transstart(); //transmission start
144 1 error=s_write_byte(STATUS_REG_R); //send command to sensor
145 1 *p_value=s_read_byte(ACK); //read status register (8-bit)
146 1 *p_checksum=s_read_byte(noACK); //read checksum (8-bit)
147 1 return error; //error=1 in case of no response form the sensor
148 1 }
149
150 //----------------------------------------------------------------------------------
151 char s_write_statusreg(unsigned char *p_value)
152 //----------------------------------------------------------------------------------
153 // writes the status register with checksum (8-bit)
154 {
155 1 unsigned char error=0;
156 1 s_transstart(); //transmission start
157 1 error+=s_write_byte(STATUS_REG_W);//send command to sensor
158 1 error+=s_write_byte(*p_value); //send value of status register
159 1 return error; //error>=1 in case of no response form the sensor
160 1 }
161
162 //----------------------------------------------------------------------------------
163 char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
164 //----------------------------------------------------------------------------------
165 // makes a measurement (humidity/temperature) with checksum
166 {
167 1 unsigned error=0;
168 1 unsigned int i;
169 1
170 1 s_transstart(); //transmission start
171 1 switch(mode){ //send command to sensor
172 2 case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
173 2 case HUMI : error+=s_write_byte(MEASURE_HUMI); break;
174 2 default : break;
175 2 }
176 1 for (i=0;i<65535;i++) if(DATA==0) break; //wait until sensor has finished the measurement
177 1 if(DATA) error+=1; // or timeout (~2 sec.) is reached
178 1 *(p_value) =s_read_byte(ACK); //read the first byte (MSB)
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