?? 3_ds.lst
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C51 COMPILER V8.09 3_DS 01/20/2009 09:40:18 PAGE 1
C51 COMPILER V8.09, COMPILATION OF MODULE 3_DS
OBJECT MODULE PLACED IN 3_ds.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 3_ds.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include<reg52.h> //Microcontroller specific library, e.g. port definitions
2 #include <intrins.h> //Keil library (is used for _nop()_ operation)
3 #include <math.h> //Keil library
4 #include <stdio.h> //Keil library
5 #include <absacc.h>
6
7
8
9 typedef union
10 { unsigned int i;
11 float f;
12 } value;
13
14 //----------------------------------------------------------------------------------
15 // modul-var
16 //----------------------------------------------------------------------------------
17 enum {TEMP,HUMI};
18
19 //#define DATA P1_0
20 //#define SCK P1_1
21
22 #define noACK 0
23 #define ACK 1
24 //adr command r/w
25 #define STATUS_REG_W 0x06 //000 0011 0
26 #define STATUS_REG_R 0x07 //000 0011 1
27 #define MEASURE_TEMP 0x03 //000 0001 1
28 #define MEASURE_HUMI 0x05 //000 0010 1
29 #define RESET 0x1e //000 1111 0
30
31
32 #define uchar unsigned char
33 #define uint unsigned int
34
35 uchar tplsb,tpmsb; // 溫度值低位、高位字節
36 uchar ds_num;
37
38 unsigned char xdata redata[8];
39 unsigned char xdata sedata[13];
40
41
42 //sbit DQ = P0^1; // 數據通信線DQ
43
44 union{
45 unsigned int ds1_temp;
46 unsigned char ds1_t[2];
47
48 }ds1;
49
50 union{
51 unsigned int ds2_temp;
52 unsigned char ds2_t[2];
53
54 }ds2;
55
C51 COMPILER V8.09 3_DS 01/20/2009 09:40:18 PAGE 2
56 union{
57 unsigned int ds3_temp;
58 unsigned char ds3_t[2];
59
60 }ds3;
61
62
63 union{
64 unsigned int s_temp;
65 unsigned char s_t[2];
66
67 }s;
68
69 sbit DATA=P1^0;
70 sbit SCK=P1^1;
71 //sbit int485=P3^2;
72 //unsigned char *tm;
73
74 //unsigned int s_temph,s_templ,ds_temph,ds_templ;
75 //float s_tem;
76 //float xdata ds1_tem,ds2_tem,ds3_tem;
77
78
79 //----------------------------------------------------------------------------------
80 char s_write_byte(unsigned char value)
81 //----------------------------------------------------------------------------------
82 // writes a byte on the Sensibus and checks the acknowledge
83 {
84 1 unsigned char i,error=0;
85 1 for (i=0x80;i>0;i/=2) //shift bit for masking
86 1 { if (i & value) DATA=1; //masking value with i , write to SENSI-BUS
87 2 else DATA=0;
88 2 SCK=1; //clk for SENSI-BUS
89 2 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
90 2 SCK=0;
91 2 }
92 1 DATA=1; //release DATA-line
93 1 SCK=1; //clk #9 for ack
94 1 error=DATA; //check ack (DATA will be pulled down by SHT11)
95 1 SCK=0;
96 1 return error; //error=1 in case of no acknowledge
97 1 }
98
99 //----------------------------------------------------------------------------------
100 char s_read_byte(unsigned char ack)
101 //----------------------------------------------------------------------------------
102 // reads a byte form the Sensibus and gives an acknowledge in case of "ack=1"
103 {
104 1 unsigned char i,val=0;
105 1 DATA=1; //release DATA-line
106 1 for (i=0x80;i>0;i/=2) //shift bit for masking
107 1 { SCK=1; //clk for SENSI-BUS
108 2 if (DATA) val=(val | i); //read bit
109 2 SCK=0;
110 2 }
111 1 DATA=!ack; //in case of "ack==1" pull down DATA-Line
112 1 SCK=1; //clk #9 for ack
113 1 _nop_();_nop_();_nop_(); //pulswith approx. 5 us
114 1 SCK=0;
115 1 DATA=1; //release DATA-line
116 1 return val;
117 1 }
C51 COMPILER V8.09 3_DS 01/20/2009 09:40:18 PAGE 3
118
119 //----------------------------------------------------------------------------------
120 void s_transstart(void)
121 //----------------------------------------------------------------------------------
122 // generates a transmission start
123 // _____ ________
124 // DATA: |_______|
125 // ___ ___
126 // SCK : ___| |___| |______
127 {
128 1 DATA=1; SCK=0; //Initial state
129 1 _nop_();
130 1 SCK=1;
131 1 _nop_();
132 1 DATA=0;
133 1 _nop_();
134 1 SCK=0;
135 1 _nop_();_nop_();_nop_();
136 1 SCK=1;
137 1 _nop_();
138 1 DATA=1;
139 1 _nop_();
140 1 SCK=0;
141 1 }
142
143 //----------------------------------------------------------------------------------
144 void s_connectionreset(void)
145 //----------------------------------------------------------------------------------
146 // communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
147 // _____________________________________________________ ________
148 // DATA: |_______|
149 // _ _ _ _ _ _ _ _ _ ___ ___
150 // SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
151 {
152 1 unsigned char i;
153 1 DATA=1; SCK=0; //Initial state
154 1 for(i=0;i<9;i++) //9 SCK cycles
155 1 { SCK=1;
156 2 SCK=0;
157 2 }
158 1 s_transstart(); //transmission start
159 1 }
160
161 //----------------------------------------------------------------------------------
162 char s_softreset(void)
163 //----------------------------------------------------------------------------------
164 // resets the sensor by a softreset
165 {
166 1 unsigned char error=0;
167 1 s_connectionreset(); //reset communication
168 1 error+=s_write_byte(RESET); //send RESET-command to sensor
169 1 return error; //error=1 in case of no response form the sensor
170 1 }
171
172 //----------------------------------------------------------------------------------
173 char s_read_statusreg(unsigned char *p_value, unsigned char *p_checksum)
174 //----------------------------------------------------------------------------------
175 // reads the status register with checksum (8-bit)
176 {
177 1 unsigned char error=0;
178 1 s_transstart(); //transmission start
179 1 error=s_write_byte(STATUS_REG_R); //send command to sensor
C51 COMPILER V8.09 3_DS 01/20/2009 09:40:18 PAGE 4
180 1 *p_value=s_read_byte(ACK); //read status register (8-bit)
181 1 *p_checksum=s_read_byte(noACK); //read checksum (8-bit)
182 1 return error; //error=1 in case of no response form the sensor
183 1 }
184
185 //----------------------------------------------------------------------------------
186 char s_write_statusreg(unsigned char *p_value)
187 //----------------------------------------------------------------------------------
188 // writes the status register with checksum (8-bit)
189 {
190 1 unsigned char error=0;
191 1 s_transstart(); //transmission start
192 1 error+=s_write_byte(STATUS_REG_W);//send command to sensor
193 1 error+=s_write_byte(*p_value); //send value of status register
194 1 return error; //error>=1 in case of no response form the sensor
195 1 }
196
197 //----------------------------------------------------------------------------------
198 char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
199 //----------------------------------------------------------------------------------
200 // makes a measurement (humidity/temperature) with checksum
201 {
202 1 unsigned error=0;
203 1 unsigned int i;
204 1
205 1 s_transstart(); //transmission start
206 1 switch(mode){ //send command to sensor
207 2 case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
208 2 case HUMI : error+=s_write_byte(MEASURE_HUMI); break;
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